South Africa









Summary

Warmest month January 23 °C
Coldest month July 11.24 °C
Average annual temperature 17.64 °C
Warmest year (1901-2012) 2010 18.84 °C
Coldest year (1901-2012) 1907 16.49 °C
Average annual temperature trend (1901-2012) +0.0139 °C
Wettest month January 67.86 mm
Driest month July 14.67 mm
Average annual precipitation 40.51 mm
Wettest year (1901-2012) 1976 689.8 mm
Driest year (1901-2012) 1992 327.9 mm
Average annual precipitation trend (1901-2012) +0.1084 mm
Month with highest average daily PEV December 5.71 mm
Month with lowest average daily PEV June 2.01 mm
Average daily PEV 3.93 mm
Year with highest average daily PEV (1901-2012) 2007 4.13 mm
Year with lowest average daily PEV (1901-2012) 1907 3.75 mm
Average annual daily PEV trend (1901-2012) +0.0015 mm
Month with highest cloudiness February 43.96 %
Month with lowest cloudiness July 21.83 %
Average annual cloudiness 35.15 %
Year with highest average cloudiness (1901-2012) 1974 40.17 %
Year with lowest average cloudiness (1901-2012) 1941 29.73 %
Average annual cloudiness trend (1901-2012) -0.0042 %

Summary graph

Summary graph for decades

Summary table of values and deviations for individual years

Year

Average

deviation

Total

deviation

Average

deviation

Average

deviation
°C
°C
%
mm
mm
%
mm
mm
%
%
%
1901 16.95 -0.69 -3.9 603.8 117.7 24.2 3.83 -0.10 -2.5 35.8 0.6
1902 16.86 -0.78 -4.4 431.7 -54.4 -11.2 3.78 -0.15 -3.8 35.8 0.6
1903 16.80 -0.84 -4.8 358.6 -127.5 -26.2 3.80 -0.13 -3.3 35.7 0.6
1904 16.78 -0.86 -4.9 441.1 -45.0 -9.3 3.78 -0.15 -3.8 35.8 0.6
1905 16.98 -0.66 -3.7 446.2 -39.9 -8.2 3.82 -0.11 -2.8 35.8 0.6
1906 16.66 -0.98 -5.6 497.5 11.4 2.3 3.76 -0.17 -4.3 35.7 0.6
1907 16.49 -1.15 -6.5 562.0 75.9 15.6 3.75 -0.18 -4.6 35.7 0.6
1908 16.78 -0.86 -4.9 407.0 -79.1 -16.3 3.78 -0.14 -3.6 35.8 0.6
1909 16.87 -0.77 -4.4 611.2 125.1 25.7 3.83 -0.10 -2.5 35.7 0.6
1910 16.62 -1.02 -5.8 500.9 14.8 3.0 3.80 -0.13 -3.3 35.7 0.6
1911 16.86 -0.78 -4.4 520.9 34.8 7.2 3.84 -0.09 -2.3 35.7 0.6
1912 17.18 -0.46 -2.6 415.8 -70.3 -14.5 3.87 -0.06 -1.5 35.8 0.6
1913 17.27 -0.37 -2.1 479.8 -6.3 -1.3 3.88 -0.05 -1.3 35.7 0.6
1914 17.32 -0.32 -1.8 502.4 16.3 3.4 3.87 -0.06 -1.5 35.8 0.6
1915 17.12 -0.52 -2.9 468.4 -17.7 -3.6 3.86 -0.07 -1.8 35.7 0.6
1916 17.08 -0.56 -3.2 396.6 -89.5 -18.4 3.87 -0.06 -1.5 35.7 0.6
1917 16.64 -1.00 -5.7 612.5 126.4 26.0 3.81 -0.12 -3.1 35.8 0.6
1918 16.91 -0.73 -4.1 572.0 85.9 17.7 3.85 -0.08 -2.0 35.7 0.6
1919 17.33 -0.31 -1.8 375.2 -110.9 -22.8 3.92 -0.01 -0.3 35.7 0.6
1920 17.23 -0.41 -2.3 525.5 39.4 8.1 3.88 -0.05 -1.3 35.7 0.6
1921 16.70 -0.94 -5.3 584.9 98.8 20.3 3.82 -0.11 -2.8 35.7 0.6
1922 17.36 -0.28 -1.6 411.2 -74.9 -15.4 3.87 -0.06 -1.5 35.7 0.6
1923 17.41 -0.23 -1.3 486.2 0.1 0.0 3.92 -0.01 -0.3 35.7 0.6
1924 16.72 -0.92 -5.2 497.1 11.0 2.3 3.83 -0.09 -2.3 35.7 0.5
1925 17.06 -0.58 -3.3 570.4 84.3 17.3 3.87 -0.06 -1.5 35.7 0.5
1926 17.18 -0.46 -2.6 388.9 -97.2 -20.0 3.88 -0.05 -1.3 35.7 0.6
1927 17.66 0.02 0.1 393.3 -92.8 -19.1 3.97 0.04 1.0 35.7 0.6
1928 17.39 -0.25 -1.4 440.4 -45.7 -9.4 3.88 -0.04 -1.0 35.7 0.6
1929 17.37 -0.27 -1.5 546.3 60.2 12.4 3.88 -0.04 -1.0 35.7 0.6
1930 17.22 -0.42 -2.4 426.2 -59.9 -12.3 3.89 -0.04 -1.0 35.7 0.6
1931 17.62 -0.02 -0.1 459.3 -26.8 -5.5 3.91 -0.02 -0.5 35.7 0.6
1932 17.94 0.30 1.7 435.4 -50.7 -10.4 3.97 0.04 1.0 35.7 0.6
1933 17.81 0.17 1.0 405.2 -80.9 -16.6 3.98 0.06 1.5 35.8 0.6
1934 17.83 0.19 1.1 568.4 82.3 16.9 3.93 -0.00 0.0 35.8 0.6
1935 17.01 -0.63 -3.6 397.6 -88.5 -18.2 3.88 -0.04 -1.0 35.7 0.6
1936 17.33 -0.31 -1.8 515.5 29.4 6.0 3.88 -0.04 -1.0 35.8 0.6
1937 17.65 0.01 0.1 459.3 -26.8 -5.5 3.96 0.03 0.8 35.7 0.6
1938 17.60 -0.04 -0.2 475.7 -10.4 -2.1 3.91 -0.02 -0.5 35.7 0.6
1939 17.37 -0.27 -1.5 578.5 92.4 19.0 3.88 -0.05 -1.3 35.8 0.6
1940 17.70 0.06 0.3 509.2 23.1 4.8 4.01 0.08 2.0 32.7 -2.4
1941 17.99 0.35 2.0 430.6 -55.5 -11.4 4.09 0.16 4.1 29.7 -5.4
1942 17.73 0.09 0.5 554.3 68.2 14.0 3.85 -0.08 -2.0 35.7 0.6
1943 17.00 -0.64 -3.6 602.4 116.3 23.9 3.82 -0.11 -2.8 37.1 1.9
1944 17.74 0.10 0.6 451.6 -34.5 -7.1 4.07 0.14 3.6 30.3 -4.8
1945 18.00 0.36 2.0 365.7 -120.4 -24.8 4.12 0.19 4.8 29.8 -5.4
1946 17.93 0.29 1.6 445.7 -40.4 -8.3 4.07 0.14 3.6 31.3 -3.9
1947 17.98 0.34 1.9 471.4 -14.7 -3.0 4.04 0.11 2.8 33.0 -2.1
1948 17.55 -0.09 -0.5 464.0 -22.1 -4.5 3.98 0.05 1.3 32.1 -3.1
1949 17.97 0.33 1.9 427.0 -59.1 -12.2 4.07 0.14 3.6 31.1 -4.0
1950 17.61 -0.03 -0.2 535.6 49.5 10.2 3.93 0.01 0.3 35.9 0.8
1951 17.22 -0.42 -2.4 407.0 -79.1 -16.3 4.03 0.10 2.5 30.6 -4.6
1952 17.75 0.11 0.6 448.9 -37.2 -7.7 4.03 0.10 2.5 32.4 -2.8
1953 17.44 -0.20 -1.1 515.6 29.5 6.1 3.92 -0.01 -0.3 34.4 -0.7
1954 17.20 -0.44 -2.5 485.6 -0.5 -0.1 3.92 -0.01 -0.3 33.9 -1.3
1955 16.76 -0.88 -5.0 580.6 94.5 19.4 3.78 -0.15 -3.8 36.9 1.7
1956 17.24 -0.40 -2.3 549.7 63.6 13.1 3.90 -0.03 -0.8 36.0 0.8
1957 17.73 0.09 0.5 544.6 58.5 12.0 3.90 -0.03 -0.8 38.1 3.0
1958 17.74 0.10 0.6 497.4 11.3 2.3 3.99 0.06 1.5 34.0 -1.1
1959 17.63 -0.01 -0.1 470.2 -15.9 -3.3 3.98 0.05 1.3 33.4 -1.7
1960 17.77 0.13 0.7 469.6 -16.5 -3.4 3.95 0.02 0.5 34.8 -0.4
1961 17.73 0.09 0.5 533.7 47.6 9.8 3.92 -0.01 -0.3 37.8 2.6
1962 17.93 0.29 1.6 449.5 -36.6 -7.5 4.04 0.11 2.8 32.3 -2.8
1963 17.73 0.09 0.5 535.1 49.0 10.1 3.88 -0.04 -1.0 37.4 2.2
1964 17.51 -0.13 -0.7 443.9 -42.2 -8.7 3.95 0.02 0.5 34.3 -0.8
1965 17.61 -0.03 -0.2 374.7 -111.4 -22.9 3.99 0.06 1.5 33.8 -1.4
1966 18.00 0.36 2.0 394.3 -91.8 -18.9 3.97 0.04 1.0 35.2 0.0
1967 17.48 -0.16 -0.9 557.0 70.9 14.6 3.87 -0.06 -1.5 38.2 3.0
1968 17.24 -0.40 -2.3 403.2 -82.9 -17.1 3.88 -0.04 -1.0 36.1 0.9
1969 17.93 0.29 1.6 455.0 -31.1 -6.4 3.93 0.01 0.3 36.3 1.1
1970 17.90 0.26 1.5 404.8 -81.3 -16.7 3.98 0.06 1.5 34.2 -0.9
1971 17.53 -0.11 -0.6 515.8 29.7 6.1 3.85 -0.08 -2.0 36.9 1.7
1972 17.86 0.22 1.2 472.5 -13.6 -2.8 3.97 0.04 1.0 33.5 -1.6
1973 17.85 0.21 1.2 494.5 8.4 1.7 3.89 -0.04 -1.0 36.6 1.5
1974 17.34 -0.30 -1.7 658.7 172.6 35.5 3.77 -0.16 -4.1 40.2 5.0
1975 17.34 -0.30 -1.7 584.0 97.9 20.1 3.85 -0.08 -2.0 36.5 1.3
1976 17.15 -0.49 -2.8 689.8 203.7 41.9 3.76 -0.17 -4.3 39.0 3.9
1977 17.86 0.22 1.2 575.6 89.5 18.4 3.89 -0.04 -1.0 36.0 0.8
1978 17.61 -0.03 -0.2 517.1 31.0 6.4 3.94 0.01 0.3 33.2 -2.0
1979 18.03 0.39 2.2 437.4 -48.7 -10.0 3.98 0.05 1.3 35.7 0.6
1980 17.84 0.20 1.1 454.6 -31.5 -6.5 3.99 0.06 1.5 32.5 -2.7
1981 17.37 -0.27 -1.5 552.6 66.5 13.7 3.86 -0.07 -1.8 36.0 0.8
1982 17.98 0.34 1.9 400.9 -85.2 -17.5 4.00 0.07 1.8 36.4 1.3
1983 18.47 0.83 4.7 440.0 -46.1 -9.5 4.03 0.10 2.5 35.2 0.1
1984 18.28 0.64 3.6 429.2 -56.9 -11.7 4.03 0.10 2.5 34.6 -0.5
1985 18.37 0.73 4.1 524.5 38.4 7.9 3.96 0.03 0.8 35.1 -0.1
1986 18.33 0.69 3.9 448.6 -37.5 -7.7 3.98 0.06 1.5 35.8 0.6
1987 18.43 0.79 4.5 487.0 0.9 0.2 3.98 0.06 1.5 36.2 1.0
1988 17.93 0.29 1.6 598.3 112.2 23.1 3.87 -0.06 -1.5 37.8 2.7
1989 17.73 0.09 0.5 527.2 41.1 8.5 3.92 -0.01 -0.3 36.1 0.9
1990 18.00 0.36 2.0 403.3 -82.8 -17.0 4.01 0.08 2.0 34.4 -0.7
1991 18.01 0.37 2.1 514.7 28.6 5.9 3.90 -0.03 -0.8 36.0 0.8
1992 18.48 0.84 4.8 327.9 -158.2 -32.5 4.12 0.19 4.8 31.6 -3.5
1993 18.52 0.88 5.0 454.7 -31.4 -6.5 3.95 0.02 0.5 36.1 0.9
1994 17.90 0.26 1.5 398.0 -88.1 -18.1 4.03 0.11 2.8 32.6 -2.6
1995 18.11 0.47 2.7 517.2 31.1 6.4 3.90 -0.03 -0.8 36.4 1.2
1996 17.56 -0.08 -0.5 589.7 103.6 21.3 3.80 -0.13 -3.3 38.0 2.9
1997 17.89 0.25 1.4 510.2 24.1 5.0 3.88 -0.04 -1.0 37.7 2.5
1998 18.33 0.69 3.9 503.7 17.6 3.6 3.95 0.02 0.5 35.5 0.4
1999 18.73 1.09 6.2 452.3 -33.8 -7.0 4.03 0.10 2.5 35.0 -0.1
2000 17.78 0.14 0.8 616.9 130.8 26.9 3.86 -0.07 -1.8 36.8 1.7
2001 18.04 0.40 2.3 574.4 88.3 18.2 3.88 -0.04 -1.0 37.5 2.3
2002 18.09 0.45 2.6 437.4 -48.7 -10.0 4.01 0.08 2.0 35.9 0.8
2003 18.43 0.79 4.5 383.3 -102.8 -21.1 4.10 0.17 4.3 32.0 -3.2
2004 18.60 0.96 5.4 485.9 -0.2 -0.0 4.07 0.14 3.6 33.0 -2.1
2005 18.69 1.05 6.0 410.5 -75.6 -15.6 4.10 0.17 4.3 32.5 -2.6
2006 18.32 0.68 3.9 590.9 104.8 21.6 3.96 0.03 0.8 36.3 1.1
2007 18.53 0.89 5.0 440.5 -45.6 -9.4 4.13 0.21 5.3 31.3 -3.9
2008 18.60 0.96 5.4 440.9 -45.2 -9.3 4.05 0.12 3.1 34.1 -1.0
2009 18.58 0.94 5.3 486.4 0.3 0.1 4.02 0.09 2.3 34.9 -0.3
2010 18.84 1.20 6.8 489.7 3.6 0.7 4.05 0.12 3.1 34.8 -0.3
2011 18.33 0.69 3.9 570.7 84.6 17.4 4.02 0.09 2.3 35.2 0.0
2012 18.35 0.71 4.0 487.3 1.2 0.2 4.07 0.14 3.6 33.5 -1.6

Summary deviations table by decades

Year

Average

deviation

Total

deviation

Average

deviation

Average

deviation
°C
°C
%
mm
mm
%
mm
mm
%
%
%
1901-1910 16.78 -0.86 -4.9 486.0 -0.1 -0.0 3.79 -0.14 -3.6 35.74 0.59
1911-1920 17.09 -0.55 -3.1 486.9 0.8 0.2 3.86 -0.07 -1.8 35.74 0.59
1921-1930 17.21 -0.43 -2.4 474.5 -11.6 -2.4 3.88 -0.05 -1.3 35.72 0.57
1931-1940 17.59 -0.05 -0.3 480.4 -5.7 -1.2 3.93 0.00 0.0 35.44 0.29
1941-1950 17.75 0.11 0.6 474.8 -11.3 -2.3 4.00 0.07 1.8 32.61 -2.54
1951-1960 17.45 -0.19 -1.1 496.9 10.8 2.2 3.94 0.01 0.3 34.44 -0.71
1961-1970 17.71 0.07 0.4 455.1 -31.0 -6.4 3.94 0.01 0.3 35.55 0.40
1971-1980 17.64 0.00 0.0 540.0 53.9 11.1 3.89 -0.04 -1.0 36.00 0.85
1981-1990 18.09 0.45 2.6 481.2 -4.9 -1.0 3.96 0.03 0.8 35.76 0.61
1991-2000 18.13 0.49 2.8 488.5 2.4 0.5 3.94 0.01 0.3 35.57 0.42
2001-2010 18.47 0.83 4.7 474.0 -12.1 -2.5 4.04 0.11 2.8 34.22 -0.93

Graph of deviations by decades

Graph of temperatures for individual years and months

Long-term temperature heatmap

Warmest and coldest months

Graph of average monthly temperature ranges

Graph of annual temperature deviations

Table of average monthly temperatures for individual decades

Month Average 1901-1910 1911-1920 1921-1930 1931-1940 1941-1950
1 23.00 22.11-0.8922.70-0.3022.65-0.3522.63-0.3723.130.13
2 22.74 21.85-0.8922.50-0.2422.37-0.3722.54-0.2023.020.28
3 21.05 20.10-0.9520.42-0.6320.61-0.4420.97-0.0821.100.05
4 17.93 17.10-0.8317.46-0.4717.52-0.4118.060.1318.170.24
5 14.38 13.65-0.7313.53-0.8513.72-0.6514.660.2914.35-0.03
6 11.45 10.74-0.7110.72-0.7310.95-0.5011.770.3211.570.12
7 11.24 10.73-0.5110.61-0.6310.67-0.5711.18-0.0611.310.07
8 13.08 12.26-0.8212.23-0.8512.41-0.6713.190.1113.420.34
9 15.89 15.01-0.8815.07-0.8215.35-0.5415.47-0.4215.910.02
10 18.43 17.20-1.2318.05-0.3818.21-0.2218.450.0218.510.08
11 20.39 19.26-1.1319.92-0.4720.11-0.2820.14-0.2520.490.10
12 22.10 21.33-0.7721.89-0.2121.90-0.2021.97-0.1322.01-0.09
Month Average 1951-1960 1961-1970 1971-1980 1981-1990 1991-2000 2001-2010
1 23.00 22.81-0.1923.340.3422.82-0.1823.650.6523.420.4223.490.49
2 22.74 22.43-0.3122.70-0.0422.51-0.2323.050.3123.290.5523.700.96
3 21.05 20.86-0.1921.280.2321.060.0121.450.4021.600.5521.800.75
4 17.93 17.63-0.3017.49-0.4418.070.1418.410.4818.370.4418.910.98
5 14.38 14.10-0.2814.30-0.0714.21-0.1615.200.8214.800.4315.290.91
6 11.45 11.24-0.2111.18-0.2711.730.2811.760.3111.910.4612.310.86
7 11.24 11.10-0.1411.250.0111.470.2311.620.3811.660.4212.000.76
8 13.08 12.88-0.2013.220.1412.93-0.1513.720.6413.600.5213.890.81
9 15.89 15.63-0.2616.390.5015.960.0716.400.5116.740.8516.720.83
10 18.43 18.30-0.1318.450.0218.42-0.0118.570.1419.010.5819.521.09
11 20.39 20.500.1120.570.1820.400.0120.830.4420.710.3221.260.87
12 22.10 21.88-0.2222.310.2122.100.0022.380.2822.450.3522.770.67

Graph of average temperatures for individual months and decades

Graph of average temperature deviations for individual months and decades

Graph of average temperature ranges in individual decades

Graph of precipitation for individual years and months

Long-term precipitation heatmap

Wettest and driest months

Graph of annual precipitation deviations

Table of average monthly precipitation for individual decades

Month Average 1901-1910 1911-1920 1921-1930 1931-1940 1941-1950
1 67.86 67.31-0.5569.041.1862.39-5.4766.09-1.7764.36-3.50
2 66.02 71.235.2171.505.4858.78-7.2469.453.4359.68-6.34
3 63.28 61.73-1.5568.274.9980.0816.8059.66-3.6268.855.57
4 36.07 35.51-0.5631.44-4.6328.23-7.8431.34-4.7342.206.13
5 21.72 21.27-0.4522.040.3219.43-2.2923.111.3923.882.16
6 16.27 14.40-1.8717.361.0918.091.8213.78-2.4914.39-1.88
7 14.67 9.75-4.9217.923.2513.63-1.0418.133.4613.37-1.30
8 17.37 14.33-3.0419.392.0216.61-0.7614.13-3.2415.69-1.68
9 24.48 31.487.0022.36-2.1227.372.8923.77-0.7122.15-2.33
10 41.28 45.714.4340.42-0.8635.26-6.0234.18-7.1040.89-0.39
11 55.05 52.11-2.9449.82-5.2354.61-0.4462.477.4251.12-3.93
12 62.01 61.17-0.8457.35-4.6660.01-2.0064.302.2958.25-3.76
Month Average 1951-1960 1961-1970 1971-1980 1981-1990 1991-2000 2001-2010
1 67.86 62.73-5.1360.98-6.8885.6117.7559.61-8.2574.546.6871.813.95
2 66.02 70.644.6251.32-14.7080.1514.1365.90-0.1263.21-2.8163.07-2.95
3 63.28 57.73-5.5558.04-5.2470.587.3055.12-8.1663.960.6851.76-11.52
4 36.07 37.791.7245.639.5640.384.3138.952.8828.02-8.0535.98-0.09
5 21.72 27.035.3121.58-0.1423.942.2216.18-5.5419.31-2.4120.71-1.01
6 16.27 14.32-1.9521.675.4012.74-3.5318.432.1614.22-2.0516.280.01
7 14.67 15.951.2813.90-0.7714.950.2815.430.7614.53-0.1412.75-1.92
8 17.37 18.170.8018.030.6622.885.5119.392.0214.40-2.9718.401.03
9 24.48 26.722.2417.86-6.6228.994.5127.402.9220.52-3.9622.07-2.41
10 41.28 41.630.3542.331.0537.77-3.5150.499.2146.204.9237.63-3.65
11 55.05 54.80-0.2553.33-1.7258.743.6954.87-0.1858.433.3857.832.78
12 62.01 69.417.4050.45-11.5663.271.2659.39-2.6271.199.1865.703.69

Graph of average precipitation for individual months and decades

Graph of average precipitation deviations for individual months and decades

Graph of cloudiness for individual years and months

Long-term cloudiness heatmap

Least and most cloudy months

Graph of annual cloudiness deviations

Table of average monthly cloudiness for individual decades

Month Average 1901-1910 1911-1920 1921-1930 1931-1940 1941-1950
1 42.89 43.100.2143.100.2143.100.2142.66-0.2341.17-1.72
2 43.96 44.200.2444.200.2444.200.2443.89-0.0741.89-2.07
3 41.32 42.000.6842.000.6842.000.6842.110.7941.870.55
4 37.13 37.800.6737.800.6737.790.6637.410.2836.00-1.13
5 28.33 28.440.1128.440.1128.430.1028.11-0.2227.12-1.21
6 24.07 24.690.6224.670.6024.670.6023.95-0.1218.26-5.81
7 21.83 22.400.5722.400.5722.390.5621.36-0.4718.94-2.89
8 24.88 25.700.8225.700.8225.670.7924.940.0620.56-4.32
9 32.26 33.501.2433.501.2433.411.1534.592.3329.43-2.83
10 41.06 41.800.7441.800.7441.760.7041.340.2838.42-2.64
11 42.80 43.500.7043.500.7043.450.6543.520.7239.14-3.66
12 41.25 41.800.5541.800.5541.730.4841.440.1938.47-2.78
Month Average 1951-1960 1961-1970 1971-1980 1981-1990 1991-2000 2001-2010
1 42.89 42.16-0.7342.25-0.6445.062.1741.95-0.9442.35-0.5444.321.43
2 43.96 43.93-0.0340.99-2.9747.423.4644.150.1943.36-0.6044.720.76
3 41.32 40.15-1.1740.45-0.8744.292.9741.330.0140.65-0.6737.92-3.40
4 37.13 34.61-2.5238.461.3337.420.2937.510.3837.420.2936.71-0.42
5 28.33 30.852.5229.501.1728.420.0928.28-0.0527.10-1.2327.14-1.19
6 24.07 21.86-2.2128.714.6421.57-2.5024.160.0924.750.6826.622.55
7 21.83 23.201.3723.091.2621.13-0.7023.091.2622.700.8719.21-2.62
8 24.88 23.30-1.5825.540.6626.361.4825.090.2126.701.8224.52-0.36
9 32.26 29.35-2.9131.05-1.2134.782.5234.592.3333.341.0828.88-3.38
10 41.06 38.26-2.8041.760.7040.08-0.9843.502.4443.592.5339.99-1.07
11 42.80 42.880.0843.951.1543.160.3643.340.5443.430.6342.09-0.71
12 41.25 42.721.4740.80-0.4542.361.1142.130.8841.410.1638.55-2.70

Graph of average cloudiness for individual months and decades

Graph of average cloudiness deviations for individual months and decades

Graph of PEV for individual years and months

Long-term daily evapotranspiration heatmap

Graph of annual PEV deviations

Table of average monthly daily potential evapotranspiration for individual decades

Month Average 1901-1910 1911-1920 1921-1930 1931-1940 1941-1950
1 5.61 5.43-0.185.55-0.065.56-0.055.60-0.015.720.11
2 4.96 4.82-0.144.94-0.024.91-0.054.94-0.025.090.13
3 4.08 3.93-0.154.01-0.074.02-0.064.08-0.004.100.02
4 3.10 2.97-0.133.05-0.053.06-0.043.110.013.140.04
5 2.42 2.35-0.072.34-0.082.39-0.032.450.032.430.01
6 2.01 1.94-0.071.95-0.061.97-0.042.040.032.090.08
7 2.25 2.18-0.072.20-0.052.21-0.042.250.002.280.03
8 3.01 2.90-0.112.93-0.082.96-0.053.050.043.110.10
9 3.96 3.82-0.143.83-0.133.87-0.093.88-0.084.040.08
10 4.72 4.51-0.214.65-0.074.69-0.034.770.054.790.07
11 5.29 5.09-0.205.20-0.095.24-0.055.26-0.035.420.13
12 5.71 5.55-0.165.70-0.015.68-0.035.730.025.820.11
Month Average 1951-1960 1961-1970 1971-1980 1981-1990 1991-2000 2001-2010
1 5.61 5.630.025.710.105.46-0.155.760.155.640.035.630.02
2 4.96 4.91-0.055.090.134.79-0.175.000.045.030.075.080.12
3 4.08 4.100.024.140.063.97-0.114.130.054.090.014.280.20
4 3.10 3.150.053.03-0.073.100.003.140.043.140.043.180.08
5 2.42 2.37-0.052.420.002.420.002.490.072.430.012.500.08
6 2.01 2.060.051.92-0.092.040.032.040.032.050.042.060.05
7 2.25 2.24-0.012.24-0.012.300.052.270.022.23-0.022.320.07
8 3.01 3.040.032.98-0.032.98-0.033.080.073.030.023.080.07
9 3.96 4.000.044.060.103.91-0.053.94-0.024.010.054.110.15
10 4.72 4.790.074.67-0.054.750.034.65-0.074.69-0.034.910.19
11 5.29 5.360.075.26-0.035.28-0.015.350.065.26-0.035.430.14
12 5.71 5.60-0.115.780.075.66-0.055.70-0.015.70-0.015.860.15

Graph of average potential evapotranspiration for individual months and decades

Graph of average potential evapotranspiration deviations for individual months and decades


Units

Language



This wiki might help to use the full potential of Cannon Rocks weather website. The info section explains the hard and software and connections used.(In the menu bar under Weather Station and Cannon Rocks Weather) Weather data updates every minute. There is a mobile page with current conditions, forecast, forecast map, station history (with drop down menu for today, yesterday, month, year etc. showing all parameters) and lastly a graph with drop down menu for time period and parameter. (Nice for quick references) One can switch to the desktop page using the link in bottom right hand corner and vice versa. The desktop version is where very detailed weather info is available. (Nice for more in depth information) It is divided in “blocks” The sunrise/sunset times and day length is shown. Moon with dates of full moon, new moon etc. The current block shows weather values in easy to read numerical format and updates every minute. “Live gauges” updates every minute and when the curser is hovered over a parameter it will show the min and max values and the time when this occurred. In the forecast maps one can use the menu bar top left of block to choose from windy or dark sky maps. Within the map one can choose from different parameters like wind, temperature, rain, thunder, clouds, pressure etc. Then station data is shown with now, max, min values and drop down menu for different time periods. There is also a history block where one can choose different parameters and a trends block with 1,3,6,12,24 hrs etc trends. Next is a forecast meteogram which is dynamic and moving the cursor over it will show all weather parameters at that point. Then easy to read forecast with dropdown the default using the Norwegian institute of meteorology values.(seems to be most accurate) Next is rainfall for today, this month, this year (from January) Drop down gives more options like seasonal(from September) etc. Rain balance is the stations values measured against 100 year rain data for Cannon Rocks district obtained from SA weather services. There are several wind parameters, graphs, wind rose, sea temperature, uv index. Next is graph with several drop down options and a day pie graph where one can pick dates and parameters. In extremes one can pick a parameter like absolute temperature, precipitation etc. to see max/min value dates and times. There is a air quality block click within block for more info. Map to show location of station. Webcam with view from Sandra Street house updates every 5 minutes. For aviation enthusiasts Cloud height time to sunset and density altitude. Then SA weather warnings from SA weather services, lightning detection and fire danger index. Followed by calendar, earthquakes and astronomical events. World weather...shows current conditions in few world cities. Database: data is stored every 5 mins and available data runs from January 2018. The menu bar at the top is really self explanatory and here one can get countless information, statistics etc.) Enjoy!! Leon :leonrossouw@me.com

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