Summary of Long Period Observations

ALTITUDE: 63.4m   LATITUDE: 51.7612 °N   LONGITUDE: 1.2640 °W
Note: All measures of temperature are in °C; rainfall is in mm.

  Period Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean air temperature 1815-2020 3.8 4.4 6.1 8.7 12.0 15.2 17.0 16.6 14.1 10.5 6.6 4.6 9.98
1991-2020 5.2 5.5 7.5 9.7 12.9 15.9 18.1 17.8 15.0 11.6 7.8 5.4 11.06
Highest mean temperature and year   7.7 8.3 9.9 13.3 14.4 18.5 21.1 20.4 17.8 14.1 10.6 10.8 12.14
1815-2023 1916 1990 1938 2011 1848 1976 1983 2022 2006 2001 1994 2015 2022
Lowest mean temperature and year   -3.0 -2.2 2.0 4.6 9.0 12.0 14.4 13.5 11.2 7.2 0.8 -1.9 7.71
1815-2023 1963 1947 1837 1837 1817 1916 1922 1912 1840 1919 1815 1890 1879
Mean of daily maximum temperature 1991-2020 8.0 8.7 11.3 14.3 17.6 20.6 23.1 22.5 19.4 15.1 10.8 8.2 15.0
Absolute maximum temperature and year   15.9 18.8 22.6 27.6 30.6 34.3 38.1 35.1 33.4 29.1 18.9 15.9 38.1
1815-2023 2016 2019 2021 2011 1944, 47 1976 2022 1932, 90 1911 2011 1946 2015 2022
Mean of daily minimum temperature 1991-2020 2.4 2.4 3.8 5.2 8.2 11.1 13.1 13.0 10.6 8.0 4.8 2.6 7.1
Absolute minimum temperature and year   -16.6 -16.1 -12.0 -5.6 -3.4 0.4 2.4 0.2 -3.3 -5.7 -10.1 -17.8 -17.8
1815-2023 1982 1947 1845 1817 1827 1827 1863 1864 1851 1859 1815 1860 1860
Absolute grass minimum temperature and year   -22.5 -22.2 -19.1 -9.5 -8.3 -3.6 -0.1 -0.1 -4.4 -10.0 -11.0 -20.1 -22.5
1931-2023 1982 1947 1947 1984, 90 1944 1991 1990 1964 1943 1997 2010 1981 1982
Mean monthly rainfall 1767-2023 52.4 41.3 41.4 43.3 51.2 52.8 58.8 57.8 58.5 65.6 61.9 56.4 641.4
1991-2020 59.4 46.2 42.5 48.5 56.9 51.0 53.1 59.1 51.4 72.0 70.6 65.5 676.3
Wettest month and year   146.9 120.3 133.9 143.0 154.9 170.4 174.8 146.2 223.9 189.0 192.4 147.9 979.5
1767-2023 2014 1937 2023 2012 1773 1852 1834 2010 1774 1875 1770 1914 2012
Driest month and year   8.1 2.2 1.4 0.5 1.5 1.7 0.8 1.8 2.6 4.1 4.8 1.7 336.7
1767-2023 1825 1959 1929 2011 1795 1925 1825 1940 1929 1809 1945 1780 1788
Mean bright sunshine hours 1991-2020 66.2 84.4 117.7 170.9 200.8 195.1 209.3 186.6 145.1 109.8 71.8 54.6 1612.2
Sunniest month and year 1881-2023 94.1 127.8 198.7 252.8 331.7 301.0 310.5 285.1 222.6 159.7 107.9 96.9 1891.4
  1952 2019 1995 1893 2020 1975 1911 1995 1911 1921 1923 2014 2022
Dullest month and year 1881-2023 14.9 22.8 48.8 81.5 98.3 100.4 95.3 97.7 64.9 43.6 29.7 5.0 1154.5
  1885 1940 1984 1966 1981 2016 1888 1912 1945 1976 1888 1890 1888
Mean number of days with rain 1991-2020 16.9 13.7 13.5 12.6 13.2 11.6 11.3 12.3 12.4 15.2 16.6 16.4 165.7
Mean number of days of snow cover 1926-2015 3.6 3.1 0.9 0.1 0 0 0 0 0 0 0.2 1.8 9.6
Mean number of days with fog 1926-2015 3.4 3.0 1.8 0.4 0.1 0.1 0.1 0.2 0.7 2.6 3.8 4.0 20.2
Mean number of air frosts 1991-2020 8.4 7.5 3.7 1.6 0.1 0 0 0 0 0.7 3.1 8.7 33.7
Mean number of ground frosts 1991-2020 17.3 15.3 14.3 9.0 2.8 0.1 0.03 0 0.6 4.6 11.3 16.4 91.8

updated to Dec 2023