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Historical Ranked Annual Data - Day Maximum (09-21) / °C

MeanMinMaxRangeNight minDay maxFeels meanFeels minFeels max
Annual
MeanLowestHighestRangeCount ≥Count <
Threshold
-5.00.05.010.015.020.025.030.0
Start year
18811950198020002009

Top annual highest
#
Value
Date
1
39.1
2022
2
37.8
2003*
3
36.8
2019
4
36.2
2020
5
35.8
2026
6
34.7
1990*
7
34.2
2015
8
34.1
2025
9
34.0
1976*
10
33.9
2018
11
33.8
1959*
12
33.5
2006*
13
33.4
1995*
14
33.2
2024
15
33.0
2017
16
32.8
2013
17
32.7
1961*
18
32.7
1957*
19
32.6
2016
20
32.5
1996*
21
32.5
1989*
22
32.3
1975*
23
32.2
1994*
24
32.2
1968*
25
31.9
2011
26
31.9
1983*
27
31.8
2005*
28
31.7
2023
29
31.7
2021
30
31.7
2010
31
31.2
2014
32
31.2
2002*
33
31.2
2001*
34
31.1
1970*
35
31.1
1969*
36
31.1
1953*
37
30.9
2000*
38
30.9
1997*
39
30.6
2012
40
30.5
1999*
41
30.5
1952*
42
30.4
1973*
43
30.1
2004*
44
30.0
1964*
45
30.0
1950*
46
29.9
1998*
47
29.8
1984*
48
29.5
2009
49
29.5
1979*
50
29.4
1971*
51
29.4
1955*
52
28.8
1992*
53
28.7
2008*
54
28.7
2007*
55
28.7
1982*
56
28.3
1960*
57
28.2
1987*
58
28.2
1986*
59
28.0
1981*
60
27.8
1977*
61
27.7
1980*
62
27.7
1967*
63
27.7
1963*
64
27.6
1993*
65
27.6
1991*
66
27.4
1954*
67
27.3
1985*
68
27.2
1988*
69
27.2
1956*
70
27.2
1951*
71
27.0
1978*
72
27.0
1972*
73
27.0
1965*
74
26.6
1966*
75
26.6
1958*
76
25.2
1962*
77
24.9
1974*
5
35.8
Current year
8
34.1
Last year
Bottom annual highest
#
Value
Date
1
24.9
1974*
2
25.2
1962*
3
26.6
1958*
4
26.6
1966*
5
27.0
1965*
6
27.0
1972*
7
27.0
1978*
8
27.2
1951*
9
27.2
1956*
10
27.2
1988*
11
27.3
1985*
12
27.4
1954*
13
27.6
1991*
14
27.6
1993*
15
27.7
1963*
16
27.7
1967*
17
27.7
1980*
18
27.8
1977*
19
28.0
1981*
20
28.2
1986*
21
28.2
1987*
22
28.3
1960*
23
28.7
1982*
24
28.7
2007*
25
28.7
2008*
26
28.8
1992*
27
29.4
1955*
28
29.4
1971*
29
29.5
1979*
30
29.5
2009
31
29.8
1984*
32
29.9
1998*
33
30.0
1950*
34
30.0
1964*
35
30.1
2004*
36
30.4
1973*
37
30.5
1952*
38
30.5
1999*
39
30.6
2012
40
30.9
1997*
41
30.9
2000*
42
31.1
1953*
43
31.1
1969*
44
31.1
1970*
45
31.2
2001*
46
31.2
2002*
47
31.2
2014
48
31.7
2010
49
31.7
2021
50
31.7
2023
51
31.8
2005*
52
31.9
1983*
53
31.9
2011
54
32.2
1968*
55
32.2
1994*
56
32.3
1975*
57
32.5
1989*
58
32.5
1996*
59
32.6
2016
60
32.7
1957*
61
32.7
1961*
62
32.8
2013
63
33.0
2017
64
33.2
2024
65
33.4
1995*
66
33.5
2006*
67
33.8
1959*
68
33.9
2018
69
34.0
1976*
70
34.1
2025
71
34.2
2015
72
34.7
1990*
73
35.8
2026
74
36.2
2020
75
36.8
2019
76
37.8
2003*
77
39.1
2022
73
35.8
Current year
70
34.1
Last year

Day Maximum (09-21) annual extremes: highest and lowest annual maxima.
There are 77 valid years for the chosen period from 1950 to present in London, NW3. Data for Day Maximum (09-21) begins in 1881.

*Data from before 2009 are mostly from the historical site at Whitestone Pond in Hampstead. Where data from that record is missing, other nearby sites were used, including St James Park, Heathrow, and Kew Gardens (pre-1910). Best efforts have been made to adjust for site differences, but uncertainties are somewhat greater for this data. I am grateful to the Met Office for making this data available for free through the MIDAS Open database.

Highest air temperature during the daytime window 09:00 to 21:00 local time.

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