Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at London South. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at London South, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
16.1 C (61.0 F)
-32.2 C (-26.0 F)
n/a
n/a
Feb
15.0 C (59.0 F)
-31.7 C (-25.1 F)
n/a
n/a
Mar
26.1 C (79.0 F)
-28.3 C (-18.9 F)
n/a
n/a
Apr
30.6 C (87.1 F)
-17.8 C (0.0 F)
n/a
n/a
May
34.4 C (93.9 F)
-4.4 C (24.1 F)
n/a
n/a
Jun
37.2 C (99.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
38.9 C (102.0 F)
2.2 C (36.0 F)
n/a
n/a
Aug
41.1 C (106.0 F)
1.7 C (35.1 F)
n/a
n/a
Sep
35.0 C (95.0 F)
-3.3 C (26.1 F)
n/a
n/a
Oct
29.4 C (84.9 F)
-10.0 C (14.0 F)
n/a
n/a
Nov
20.6 C (69.1 F)
-16.7 C (1.9 F)
n/a
n/a
Dec
14.4 C (57.9 F)
-30.0 C (-22.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at London South still stand. 1885 holds the most, with 57.
Standing records at London South by the year they were set
Year set
Standing records
1883
45
1884
38
1885
57
1886
33
1887
34
1888
35
1889
32
1890
21
1891
35
1892
26
1893
18
1894
37
1895
52
1896
41
1897
26
1898
29
1899
48
1900
44
1901
17
1902
31
1903
37
1904
27
1905
22
1906
27
1907
19
1908
22
1909
22
1910
20
1911
38
1912
25
1913
24
1914
31
1915
18
1916
39
1917
32
1918
28
1919
30
1920
24
1921
31
1922
20
1923
28
1924
19
1925
27
1926
18
1927
23
1928
19
1929
33
1930
33
1931
23
1932
6
All-Time Record Progression
2 new records
2 all-time records were set at London South between 6 August 1918 and 7 August 1918. Each dot is a new record.
When London South set new all-time records
Date
Kind
Detail
1918-08-06
Record high maximum temperature
Record high maximum temperature 41.1 C (106.0 F)
1918-08-07
Record high minimum temperature
Record high minimum temperature 25.6 C (78.1 F)
Wettest Day of Each Month
May: 130.0 mm (5.1 in)
The wettest day on record for each calendar month at London South. The most was 130.0 mm (5.1 in) on 17 May 1894.
Record daily precipitation for each month at London South
Month
Record daily precipitation (mm)
Date
Jan
49.5 mm (1.9 in)
29 January 1893
Feb
39.4 mm (1.6 in)
6 February 1893
Mar
40.6 mm (1.6 in)
19 March 1883
Apr
55.9 mm (2.2 in)
29 April 1909
May
130.0 mm (5.1 in)
17 May 1894
Jun
98.0 mm (3.9 in)
3 June 1892
Jul
80.0 mm (3.1 in)
10 July 1921
Aug
71.1 mm (2.8 in)
9 August 1892
Sep
44.2 mm (1.7 in)
5 September 1918
Oct
87.4 mm (3.4 in)
14 October 1893
Nov
62.7 mm (2.5 in)
22 November 1909
Dec
47.5 mm (1.9 in)
17 December 1921
Period of Record Coverage
1883 to 1932
Complete yearUnder 90 percent of days
50 years of record at London South, 1883 to 1932. 3 years have data for under 90 percent of days and are left out of rankings: 1883, 1890, 1932.
Cooler than the station meanWarmer than the station mean
One stripe for each of 47 complete years at London South, 1884 to 1931. Blue stripes are years cooler than the station's own mean of 7.6 C (45.6 F); red stripes are warmer. The coolest year was 1885, at 5.2 C (41.3 F), and the warmest was 1921, at 9.9 C (49.8 F). The strongest colour marks a difference of 2.5 C (4.5 F).
Annual mean temperature at London South as warming stripes, 1884 to 1931
Year
Annual mean temperature
Difference from the station mean
1884
6.6 C
-0.96 C
1885
5.2 C
-2.40 C
1886
6.5 C
-1.08 C
1887
6.9 C
-0.71 C
1888
6.0 C
-1.55 C
1889
7.6 C
+0.04 C
1891
8.0 C
+0.42 C
1892
7.2 C
-0.36 C
1893
6.7 C
-0.87 C
1894
8.5 C
+0.96 C
1895
6.9 C
-0.71 C
1896
7.8 C
+0.28 C
1897
7.8 C
+0.21 C
1898
8.5 C
+0.90 C
1899
7.9 C
+0.32 C
1900
8.3 C
+0.75 C
1901
7.6 C
+0.08 C
1902
7.6 C
0.00 C
1903
7.5 C
-0.04 C
1904
5.9 C
-1.67 C
1905
7.0 C
-0.52 C
1906
8.1 C
+0.53 C
1907
6.7 C
-0.87 C
1908
8.2 C
+0.62 C
1909
8.0 C
+0.46 C
1910
7.7 C
+0.14 C
1911
8.6 C
+1.07 C
1912
7.1 C
-0.45 C
1913
8.4 C
+0.83 C
1914
7.5 C
-0.04 C
1915
7.7 C
+0.09 C
1916
7.7 C
+0.10 C
1917
5.7 C
-1.83 C
1918
8.0 C
+0.39 C
1919
8.8 C
+1.22 C
1920
7.5 C
-0.07 C
1921
9.9 C
+2.33 C
1922
8.6 C
+1.08 C
1923
7.8 C
+0.20 C
1924
6.7 C
-0.87 C
1925
7.6 C
+0.01 C
1926
6.6 C
-0.94 C
1927
8.2 C
+0.62 C
1928
7.8 C
+0.22 C
1929
7.4 C
-0.18 C
1930
8.2 C
+0.66 C
1931
9.4 C
+1.82 C
The annual mean temperature here has risen by 0.3 C (0.1 to 0.4) per decade over 1884 to 1931. In Fahrenheit: 0.5 F (0.1 to 0.8) per decade. The slope is a straight line fitted to 47 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at London South
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.3 C (0.1 to 0.4) per decade
0.5 F (0.1 to 0.8) per decade
1884 to 1931
47
Rise
Mean daily maximum
0.3 C (0.1 to 0.5) per decade
0.6 F (0.2 to 0.9) per decade
1884 to 1931
47
Rise
Mean daily minimum
0.22 C (0.04 to 0.39) per decade
0.4 F (0.1 to 0.7) per decade
1884 to 1931
47
Rise
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1883 to 1932
Yearly extremes at London South: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.1 C (106.0 F)
1918
34.4 C (93.9 F)
50
Coldest night (TNn)
-32.2 C (-26.0 F)
1892
-26.7 C (-16.1 F)
50
Wettest day (Rx1day)
130.0 mm (5.1 in)
1894
44.1 mm (1.7 in)
50
Wettest five days (Rx5day)
174.5 mm (6.9 in)
1894
69.0 mm (2.7 in)
50
Longest dry spell (CDD)
35 days
1924
17 days
50
Hottest day (TXx)
The hottest day of the year at London South, 1883 to 1932. The record is 41.1 C (106.0 F) in 1918, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at London South by year
Year
Hottest day (TXx)
1883
31.1 C (88.0 F)
1884
31.7 C (89.1 F)
1885
30.0 C (86.0 F)
1886
32.2 C (90.0 F)
1887
35.0 C (95.0 F)
1888
31.1 C (88.0 F)
1889
31.7 C (89.1 F)
1890
30.0 C (86.0 F)
1891
34.4 C (93.9 F)
1892
33.9 C (93.0 F)
1893
33.3 C (91.9 F)
1894
35.0 C (95.0 F)
1895
34.4 C (93.9 F)
1896
33.9 C (93.0 F)
1897
35.6 C (96.1 F)
1898
36.7 C (98.1 F)
1899
35.6 C (96.1 F)
1900
35.0 C (95.0 F)
1901
36.7 C (98.1 F)
1902
32.2 C (90.0 F)
1903
32.2 C (90.0 F)
1904
33.3 C (91.9 F)
1905
32.8 C (91.0 F)
1906
32.2 C (90.0 F)
1907
30.6 C (87.1 F)
1908
35.0 C (95.0 F)
1909
34.4 C (93.9 F)
1910
36.1 C (97.0 F)
1911
38.9 C (102.0 F)
1912
33.9 C (93.0 F)
1913
34.4 C (93.9 F)
1914
35.0 C (95.0 F)
1915
31.7 C (89.1 F)
1916
37.8 C (100.0 F)
1917
36.7 C (98.1 F)
1918
41.1 C (106.0 F)
1919
36.7 C (98.1 F)
1920
34.4 C (93.9 F)
1921
37.8 C (100.0 F)
1922
35.0 C (95.0 F)
1923
36.7 C (98.1 F)
1924
34.4 C (93.9 F)
1925
37.2 C (99.0 F)
1926
36.1 C (97.0 F)
1927
36.1 C (97.0 F)
1928
32.8 C (91.0 F)
1929
34.4 C (93.9 F)
1930
35.6 C (96.1 F)
1931
37.2 C (99.0 F)
1932
14.4 C (57.9 F)
Coldest night (TNn)
The coldest night of the year at London South, 1883 to 1932. The record is -32.2 C (-26.0 F) in 1892, marked on the chart; the median year is -26.7 C (-16.1 F).
Coldest night (TNn) at London South by year
Year
Coldest night (TNn)
1883
-25.6 C (-14.1 F)
1884
-31.1 C (-24.0 F)
1885
-30.6 C (-23.1 F)
1886
-28.3 C (-18.9 F)
1887
-26.1 C (-15.0 F)
1888
-27.2 C (-17.0 F)
1889
-30.6 C (-23.1 F)
1890
-22.2 C (-8.0 F)
1891
-20.6 C (-5.1 F)
1892
-32.2 C (-26.0 F)
1893
-31.7 C (-25.1 F)
1894
-24.4 C (-11.9 F)
1895
-31.1 C (-24.0 F)
1896
-27.2 C (-17.0 F)
1897
-26.1 C (-15.0 F)
1898
-22.8 C (-9.0 F)
1899
-31.7 C (-25.1 F)
1900
-27.2 C (-17.0 F)
1901
-23.9 C (-11.0 F)
1902
-26.7 C (-16.1 F)
1903
-24.4 C (-11.9 F)
1904
-30.0 C (-22.0 F)
1905
-27.2 C (-17.0 F)
1906
-27.2 C (-17.0 F)
1907
-25.6 C (-14.1 F)
1908
-28.9 C (-20.0 F)
1909
-26.1 C (-15.0 F)
1910
-26.7 C (-16.1 F)
1911
-22.2 C (-8.0 F)
1912
-31.7 C (-25.1 F)
1913
-21.7 C (-7.1 F)
1914
-30.0 C (-22.0 F)
1915
-29.4 C (-20.9 F)
1916
-26.7 C (-16.1 F)
1917
-27.8 C (-18.0 F)
1918
-29.4 C (-20.9 F)
1919
-20.6 C (-5.1 F)
1920
-27.8 C (-18.0 F)
1921
-16.7 C (1.9 F)
1922
-20.0 C (-4.0 F)
1923
-21.7 C (-7.1 F)
1924
-25.0 C (-13.0 F)
1925
-27.8 C (-18.0 F)
1926
-22.2 C (-8.0 F)
1927
-23.9 C (-11.0 F)
1928
-27.8 C (-18.0 F)
1929
-28.9 C (-20.0 F)
1930
-22.8 C (-9.0 F)
1931
-16.7 C (1.9 F)
1932
-15.0 C (5.0 F)
Wettest day (Rx1day)
The wettest day of the year at London South, 1883 to 1932. The record is 130.0 mm (5.1 in) in 1894, marked on the chart; the median year is 44.1 mm (1.7 in).
Wettest day (Rx1day) at London South by year
Year
Wettest day (Rx1day)
1883
40.6 mm (1.6 in)
1884
38.1 mm (1.5 in)
1885
60.7 mm (2.4 in)
1886
54.6 mm (2.1 in)
1887
46.5 mm (1.8 in)
1888
64.8 mm (2.6 in)
1889
55.6 mm (2.2 in)
1890
36.3 mm (1.4 in)
1891
51.6 mm (2.0 in)
1892
98.0 mm (3.9 in)
1893
87.4 mm (3.4 in)
1894
130.0 mm (5.1 in)
1895
43.7 mm (1.7 in)
1896
47.2 mm (1.9 in)
1897
40.6 mm (1.6 in)
1898
48.3 mm (1.9 in)
1899
34.8 mm (1.4 in)
1900
38.1 mm (1.5 in)
1901
19.1 mm (0.8 in)
1902
18.0 mm (0.7 in)
1903
30.2 mm (1.2 in)
1904
58.4 mm (2.3 in)
1905
44.5 mm (1.8 in)
1906
34.3 mm (1.4 in)
1907
36.8 mm (1.4 in)
1908
43.7 mm (1.7 in)
1909
62.7 mm (2.5 in)
1910
34.3 mm (1.4 in)
1911
36.3 mm (1.4 in)
1912
43.9 mm (1.7 in)
1913
41.1 mm (1.6 in)
1914
37.1 mm (1.5 in)
1915
53.8 mm (2.1 in)
1916
62.5 mm (2.5 in)
1917
54.9 mm (2.2 in)
1918
44.2 mm (1.7 in)
1919
55.6 mm (2.2 in)
1920
40.1 mm (1.6 in)
1921
80.0 mm (3.1 in)
1922
38.1 mm (1.5 in)
1923
45.2 mm (1.8 in)
1924
36.1 mm (1.4 in)
1925
29.0 mm (1.1 in)
1926
51.8 mm (2.0 in)
1927
38.1 mm (1.5 in)
1928
51.3 mm (2.0 in)
1929
36.6 mm (1.4 in)
1930
55.1 mm (2.2 in)
1931
49.8 mm (2.0 in)
1932
26.4 mm (1.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at London South, 1883 to 1932. The record is 174.5 mm (6.9 in) in 1894, marked on the chart; the median year is 69.0 mm (2.7 in).
Wettest five days (Rx5day) at London South by year
Year
Wettest five days (Rx5day)
1883
94.0 mm (3.7 in)
1884
66.0 mm (2.6 in)
1885
74.9 mm (2.9 in)
1886
59.5 mm (2.3 in)
1887
85.6 mm (3.4 in)
1888
103.9 mm (4.1 in)
1889
91.7 mm (3.6 in)
1890
66.8 mm (2.6 in)
1891
86.9 mm (3.4 in)
1892
134.0 mm (5.3 in)
1893
98.6 mm (3.9 in)
1894
174.5 mm (6.9 in)
1895
55.2 mm (2.2 in)
1896
81.7 mm (3.2 in)
1897
56.6 mm (2.2 in)
1898
74.3 mm (2.9 in)
1899
67.3 mm (2.6 in)
1900
64.9 mm (2.6 in)
1901
34.9 mm (1.4 in)
1902
38.1 mm (1.5 in)
1903
49.1 mm (1.9 in)
1904
69.1 mm (2.7 in)
1905
66.5 mm (2.6 in)
1906
77.5 mm (3.1 in)
1907
57.6 mm (2.3 in)
1908
55.9 mm (2.2 in)
1909
102.6 mm (4.0 in)
1910
80.9 mm (3.2 in)
1911
68.6 mm (2.7 in)
1912
75.2 mm (3.0 in)
1913
80.9 mm (3.2 in)
1914
54.6 mm (2.1 in)
1915
106.2 mm (4.2 in)
1916
62.5 mm (2.5 in)
1917
68.9 mm (2.7 in)
1918
61.4 mm (2.4 in)
1919
99.7 mm (3.9 in)
1920
58.9 mm (2.3 in)
1921
107.2 mm (4.2 in)
1922
79.5 mm (3.1 in)
1923
61.0 mm (2.4 in)
1924
60.7 mm (2.4 in)
1925
68.6 mm (2.7 in)
1926
67.3 mm (2.6 in)
1927
73.4 mm (2.9 in)
1928
63.7 mm (2.5 in)
1929
88.4 mm (3.5 in)
1930
80.9 mm (3.2 in)
1931
85.9 mm (3.4 in)
1932
50.8 mm (2.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at London South, 1883 to 1932. The record is 35 days in 1924, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at London South by year
Year
Longest dry spell (CDD)
1883
14 days
1884
14 days
1885
18 days
1886
20 days
1887
28 days
1888
21 days
1889
26 days
1890
16 days
1891
22 days
1892
24 days
1893
12 days
1894
26 days
1895
18 days
1896
13 days
1897
20 days
1898
14 days
1899
20 days
1900
15 days
1901
16 days
1902
21 days
1903
14 days
1904
17 days
1905
11 days
1906
25 days
1907
15 days
1908
25 days
1909
20 days
1910
16 days
1911
17 days
1912
14 days
1913
20 days
1914
15 days
1915
19 days
1916
30 days
1917
19 days
1918
17 days
1919
16 days
1920
12 days
1921
25 days
1922
17 days
1923
15 days
1924
35 days
1925
15 days
1926
14 days
1927
13 days
1928
10 days
1929
19 days
1930
18 days
1931
10 days
1932
4 days
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
47 years with a frost
Across 47 years with a frost, the median last spring frost at London South falls on 17 May and the median first autumn frost on 1 October, which leaves a median of 136 days between them.
Fitted over all years, the growing season changes by -2.3 days per decade at this station.
Frost dates and growing season at London South
Measure
Median, all years
Earliest period
Recent period (1902 to 1931)
Recent against earliest
Fitted trend
Last spring frost
17 May
n/a
18 May
n/a
+1.0 days per decade
First autumn frost
1 October
n/a
29 September
n/a
-1.4 days per decade
Growing days
136 days
n/a
134 days
n/a
-2.3 days per decade
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
47 years, 1884 to 1931
A day with at least 44.6 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 118.1 mm (4.6 in) of rain is expected about once in 100 years.
Rainfall return levels at London South: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
44.6 mm (1.8 in)
5 years
60.0 mm (2.4 in)
10 years
71.8 mm (2.8 in)
25 years
88.5 mm (3.5 in)
50 years
102.6 mm (4.0 in)
Longer than the 47 years of record
100 years
118.1 mm (4.6 in)
Longer than the 47 years of record
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 47 years of values from 1884 to 1931.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 130.0 mm (5.1 in) in 1894; 98.0 mm (3.9 in) in 1892; 87.4 mm (3.4 in) in 1893.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for London South standing records by year: CSV or JSON. Field meanings are on the data page.
Data for London South threshold days by year: CSV or JSON. Field meanings are on the data page.
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-16 (16 October 2026). Records are computed by this site and are not official.