Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Helgoland. The lines show the 2026 daily maximum and minimum. 7 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Helgoland, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
11.6 C (52.9 F)
-10.7 C (12.7 F)
8.5 C (47.3 F)
-2.5 C (27.5 F)
Feb
11.1 C (52.0 F)
-11.2 C (11.8 F)
8.1 C (46.6 F)
-5.3 C (22.5 F)
Mar
14.9 C (58.8 F)
-7.0 C (19.4 F)
9.6 C (49.3 F)
1.9 C (35.4 F)
Apr
19.6 C (67.3 F)
-2.1 C (28.2 F)
14.4 C (57.9 F)
4.4 C (39.9 F)
May
23.9 C (75.0 F)
1.6 C (34.9 F)
21.6 C (70.9 F)
6.8 C (44.2 F)
Jun
30.4 C (86.7 F)
5.0 C (41.0 F)
30.4 C (86.7 F)
10.2 C (50.4 F)
Jul
28.7 C (83.7 F)
7.2 C (45.0 F)
25.9 C (78.6 F)
14.3 C (57.7 F)
Aug
28.1 C (82.6 F)
9.0 C (48.2 F)
26.7 C (80.1 F)
13.1 C (55.6 F)
Sep
24.4 C (75.9 F)
5.7 C (42.3 F)
n/a
n/a
Oct
19.5 C (67.1 F)
1.5 C (34.7 F)
n/a
n/a
Nov
16.8 C (62.2 F)
-4.0 C (24.8 F)
n/a
n/a
Dec
12.9 C (55.2 F)
-8.0 C (17.6 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Helgoland still stand. 2007 holds the most, with 56.
Standing records at Helgoland by the year they were set
Year set
Standing records
1952
17
1953
17
1954
11
1955
31
1956
54
1957
12
1958
19
1959
10
1960
10
1961
12
1962
28
1963
28
1964
15
1965
25
1966
25
1967
4
1968
12
1969
18
1970
20
1971
11
1972
10
1973
9
1974
9
1975
24
1976
11
1977
7
1978
34
1979
32
1980
17
1981
20
1982
17
1983
6
1984
7
1985
35
1986
18
1987
48
1988
4
1989
12
1990
45
1991
7
1992
13
1993
15
1994
21
1995
14
1996
17
1997
16
1998
14
1999
9
2000
16
2001
11
2002
33
2003
13
2004
6
2005
13
2006
54
2007
56
2008
4
2009
6
2010
23
2011
12
2012
9
2013
13
2014
37
2015
29
2016
30
2017
5
2018
38
2019
9
2020
25
2021
9
2022
25
2023
36
2024
52
2025
18
2026
12
All-Time Record Progression
7 new records
7 all-time records were set at Helgoland between 9 January 1985 and 27 June 2026. Each dot is a new record.
When Helgoland set new all-time records
Date
Kind
Detail
1985-01-09
Record snow depth
Record snow depth 25.0 cm (9.8 in)
1994-07-25
Record high maximum temperature
Record high maximum temperature 28.7 C (83.7 F)
2003-08-09
Record high minimum temperature
Record high minimum temperature 21.1 C (70.0 F)
2006-08-28
Record daily precipitation
Record daily precipitation 64.9 mm (2.6 in)
2018-07-27
Record high minimum temperature
Record high minimum temperature 21.9 C (71.4 F)
2022-08-17
Record daily precipitation
Record daily precipitation 98.9 mm (3.9 in)
2026-06-27
Record high maximum temperature
Record high maximum temperature 30.4 C (86.7 F)
Wettest Day of Each Month
Aug: 98.9 mm (3.9 in)
The wettest day on record for each calendar month at Helgoland. The most was 98.9 mm (3.9 in) on 17 August 2022.
Record daily precipitation for each month at Helgoland
Month
Record daily precipitation (mm)
Date
Jan
31.5 mm (1.2 in)
31 January 1957
Feb
22.0 mm (0.9 in)
18 February 2024
Mar
25.0 mm (1.0 in)
27 March 1967
Apr
34.0 mm (1.3 in)
29 April 2018
May
34.7 mm (1.4 in)
21 May 1953
Jun
55.3 mm (2.2 in)
24 June 1969
Jul
59.8 mm (2.4 in)
30 July 1966
Aug
98.9 mm (3.9 in)
17 August 2022
Sep
44.0 mm (1.7 in)
14 September 1994
Oct
56.8 mm (2.2 in)
2 October 2008
Nov
46.3 mm (1.8 in)
3 November 1968
Dec
35.8 mm (1.4 in)
14 December 1989
Period of Record Coverage
1952 to 2026
Complete yearUnder 90 percent of days
75 years of record at Helgoland, 1952 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1952, 2026.
Cooler than the station meanWarmer than the station mean
One stripe for each of 72 complete years at Helgoland, 1953 to 2025. Blue stripes are years cooler than the station's own mean of 9.6 C (49.3 F); red stripes are warmer. The coolest year was 1963, at 7.5 C (45.5 F), and the warmest was 2024, at 11.6 C (52.8 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Helgoland as warming stripes, 1953 to 2025
Year
Annual mean temperature
Difference from the station mean
1953
9.9 C
+0.25 C
1954
8.5 C
-1.11 C
1955
8.7 C
-0.88 C
1956
8.0 C
-1.63 C
1957
9.4 C
-0.21 C
1958
8.9 C
-0.71 C
1959
10.0 C
+0.38 C
1960
9.1 C
-0.48 C
1961
9.7 C
+0.07 C
1962
8.2 C
-1.39 C
1963
7.5 C
-2.12 C
1964
8.5 C
-1.07 C
1965
8.5 C
-1.15 C
1966
8.7 C
-0.94 C
1967
9.8 C
+0.14 C
1968
9.1 C
-0.56 C
1969
8.5 C
-1.09 C
1970
8.4 C
-1.20 C
1971
9.3 C
-0.35 C
1972
8.7 C
-0.87 C
1973
9.4 C
-0.17 C
1974
9.6 C
-0.02 C
1975
10.0 C
+0.35 C
1976
9.2 C
-0.38 C
1977
9.3 C
-0.29 C
1978
8.7 C
-0.95 C
1979
7.9 C
-1.76 C
1980
8.7 C
-0.91 C
1981
8.7 C
-0.90 C
1982
9.5 C
-0.13 C
1983
9.8 C
+0.14 C
1984
9.0 C
-0.61 C
1985
8.1 C
-1.49 C
1986
8.5 C
-1.10 C
1987
8.2 C
-1.42 C
1988
9.9 C
+0.27 C
1989
10.6 C
+0.94 C
1990
10.5 C
+0.93 C
1991
9.5 C
-0.14 C
1992
10.4 C
+0.80 C
1993
9.1 C
-0.55 C
1994
10.1 C
+0.49 C
1995
10.0 C
+0.40 C
1996
8.0 C
-1.63 C
1997
9.7 C
+0.10 C
1998
9.7 C
+0.10 C
1999
10.6 C
+1.03 C
2000
10.5 C
+0.87 C
2001
9.8 C
+0.17 C
2002
10.4 C
+0.78 C
2003
10.1 C
+0.47 C
2004
10.1 C
+0.52 C
2005
10.1 C
+0.48 C
2006
10.7 C
+1.05 C
2007
11.0 C
+1.40 C
2008
10.6 C
+0.96 C
2009
10.2 C
+0.61 C
2010
8.6 C
-1.04 C
2011
10.1 C
+0.44 C
2012
9.8 C
+0.16 C
2013
9.3 C
-0.29 C
2014
11.4 C
+1.83 C
2015
10.6 C
+0.99 C
2016
10.7 C
+1.07 C
2017
10.5 C
+0.89 C
2018
10.6 C
+0.99 C
2019
10.9 C
+1.28 C
2020
11.3 C
+1.70 C
2022
11.2 C
+1.60 C
2023
11.2 C
+1.55 C
2024
11.6 C
+1.97 C
2025
11.1 C
+1.52 C
The annual mean temperature here has risen by 0.3 C (0.3 to 0.4) per decade over 1953 to 2025. In Fahrenheit: 0.6 F (0.5 to 0.7) per decade. The slope is a straight line fitted to 72 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Helgoland
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.3 C (0.3 to 0.4) per decade
0.6 F (0.5 to 0.7) per decade
1953 to 2025
72
Rise
Mean daily maximum
0.3 C (0.3 to 0.4) per decade
0.6 F (0.5 to 0.7) per decade
1953 to 2025
72
Rise
Mean daily minimum
0.3 C (0.2 to 0.4) per decade
0.6 F (0.4 to 0.7) per decade
1953 to 2025
72
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
1952 to 2026
Yearly extremes at Helgoland: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
30.4 C (86.7 F)
2026
24.7 C (76.5 F)
75
Coldest night (TNn)
-11.2 C (11.8 F)
1956
-4.9 C (23.2 F)
75
Wettest day (Rx1day)
98.9 mm (3.9 in)
2022
30.8 mm (1.2 in)
75
Wettest five days (Rx5day)
159.3 mm (6.3 in)
2008
59.4 mm (2.3 in)
75
Longest dry spell (CDD)
36 days
1992
21 days
75
Hottest day (TXx)
The hottest day of the year at Helgoland, 1952 to 2026. The record is 30.4 C (86.7 F) in 2026, marked on the chart; the median year is 24.7 C (76.5 F).
Hottest day (TXx) at Helgoland by year
Year
Hottest day (TXx)
1952
23.1 C (73.6 F)
1953
24.2 C (75.6 F)
1954
22.0 C (71.6 F)
1955
24.3 C (75.7 F)
1956
22.3 C (72.1 F)
1957
23.9 C (75.0 F)
1958
21.8 C (71.2 F)
1959
26.1 C (79.0 F)
1960
22.6 C (72.7 F)
1961
25.4 C (77.7 F)
1962
20.0 C (68.0 F)
1963
25.2 C (77.4 F)
1964
23.5 C (74.3 F)
1965
21.0 C (69.8 F)
1966
23.2 C (73.8 F)
1967
23.5 C (74.3 F)
1968
23.8 C (74.8 F)
1969
24.6 C (76.3 F)
1970
23.7 C (74.7 F)
1971
23.4 C (74.1 F)
1972
25.0 C (77.0 F)
1973
24.3 C (75.7 F)
1974
22.7 C (72.9 F)
1975
28.1 C (82.6 F)
1976
25.0 C (77.0 F)
1977
22.2 C (72.0 F)
1978
23.4 C (74.1 F)
1979
20.9 C (69.6 F)
1980
21.7 C (71.1 F)
1981
22.0 C (71.6 F)
1982
26.2 C (79.2 F)
1983
25.0 C (77.0 F)
1984
23.7 C (74.7 F)
1985
22.4 C (72.3 F)
1986
25.4 C (77.7 F)
1987
22.6 C (72.7 F)
1988
21.4 C (70.5 F)
1989
25.3 C (77.5 F)
1990
25.5 C (77.9 F)
1991
24.4 C (75.9 F)
1992
27.0 C (80.6 F)
1993
21.5 C (70.7 F)
1994
28.7 C (83.7 F)
1995
26.7 C (80.1 F)
1996
25.2 C (77.4 F)
1997
26.8 C (80.2 F)
1998
22.7 C (72.9 F)
1999
25.7 C (78.3 F)
2000
25.4 C (77.7 F)
2001
24.6 C (76.3 F)
2002
25.5 C (77.9 F)
2003
28.0 C (82.4 F)
2004
25.1 C (77.2 F)
2005
22.7 C (72.9 F)
2006
26.7 C (80.1 F)
2007
25.1 C (77.2 F)
2008
25.3 C (77.5 F)
2009
25.2 C (77.4 F)
2010
25.8 C (78.4 F)
2011
22.5 C (72.5 F)
2012
24.3 C (75.7 F)
2013
26.4 C (79.5 F)
2014
25.9 C (78.6 F)
2015
25.9 C (78.6 F)
2016
24.4 C (75.9 F)
2017
23.6 C (74.5 F)
2018
28.2 C (82.8 F)
2019
25.8 C (78.4 F)
2020
26.7 C (80.1 F)
2021
25.0 C (77.0 F)
2022
25.6 C (78.1 F)
2023
25.0 C (77.0 F)
2024
24.7 C (76.5 F)
2025
24.9 C (76.8 F)
2026
30.4 C (86.7 F)
Coldest night (TNn)
The coldest night of the year at Helgoland, 1952 to 2026. The record is -11.2 C (11.8 F) in 1956, marked on the chart; the median year is -4.9 C (23.2 F).
Coldest night (TNn) at Helgoland by year
Year
Coldest night (TNn)
1952
-2.4 C (27.7 F)
1953
-7.7 C (18.1 F)
1954
-8.3 C (17.1 F)
1955
-4.8 C (23.4 F)
1956
-11.2 C (11.8 F)
1957
-4.5 C (23.9 F)
1958
-5.3 C (22.5 F)
1959
-6.5 C (20.3 F)
1960
-5.1 C (22.8 F)
1961
-6.2 C (20.8 F)
1962
-4.8 C (23.4 F)
1963
-9.2 C (15.4 F)
1964
-5.1 C (22.8 F)
1965
-4.2 C (24.4 F)
1966
-6.4 C (20.5 F)
1967
-4.5 C (23.9 F)
1968
-7.2 C (19.0 F)
1969
-7.6 C (18.3 F)
1970
-6.8 C (19.8 F)
1971
-7.2 C (19.0 F)
1972
-10.1 C (13.8 F)
1973
-2.7 C (27.1 F)
1974
-2.1 C (28.2 F)
1975
-1.5 C (29.3 F)
1976
-5.5 C (22.1 F)
1977
-3.4 C (25.9 F)
1978
-8.0 C (17.6 F)
1979
-7.9 C (17.8 F)
1980
-5.1 C (22.8 F)
1981
-7.5 C (18.5 F)
1982
-7.8 C (18.0 F)
1983
-3.8 C (25.2 F)
1984
-3.8 C (25.2 F)
1985
-8.3 C (17.1 F)
1986
-6.0 C (21.2 F)
1987
-10.7 C (12.7 F)
1988
-2.3 C (27.9 F)
1989
-1.9 C (28.6 F)
1990
-0.7 C (30.7 F)
1991
-6.4 C (20.5 F)
1992
-2.5 C (27.5 F)
1993
-6.0 C (21.2 F)
1994
-8.3 C (17.1 F)
1995
-5.0 C (23.0 F)
1996
-8.6 C (16.5 F)
1997
-6.2 C (20.8 F)
1998
-3.9 C (25.0 F)
1999
-3.7 C (25.3 F)
2000
-1.7 C (28.9 F)
2001
-3.6 C (25.5 F)
2002
-4.5 C (23.9 F)
2003
-4.9 C (23.2 F)
2004
-2.8 C (27.0 F)
2005
-3.8 C (25.2 F)
2006
-4.6 C (23.7 F)
2007
-1.8 C (28.8 F)
2008
-2.2 C (28.0 F)
2009
-3.6 C (25.5 F)
2010
-6.6 C (20.1 F)
2011
-4.6 C (23.7 F)
2012
-7.4 C (18.7 F)
2013
-5.3 C (22.5 F)
2014
-6.6 C (20.1 F)
2015
-1.5 C (29.3 F)
2016
-3.9 C (25.0 F)
2017
-3.4 C (25.9 F)
2018
-7.0 C (19.4 F)
2019
-4.9 C (23.2 F)
2020
1.1 C (34.0 F)
2021
-4.5 C (23.9 F)
2022
0.1 C (32.2 F)
2023
-0.6 C (30.9 F)
2024
-1.6 C (29.1 F)
2025
-1.5 C (29.3 F)
2026
-5.3 C (22.5 F)
Wettest day (Rx1day)
The wettest day of the year at Helgoland, 1952 to 2026. The record is 98.9 mm (3.9 in) in 2022, marked on the chart; the median year is 30.8 mm (1.2 in).
Wettest day (Rx1day) at Helgoland by year
Year
Wettest day (Rx1day)
1952
42.1 mm (1.7 in)
1953
45.0 mm (1.8 in)
1954
30.8 mm (1.2 in)
1955
30.1 mm (1.2 in)
1956
23.1 mm (0.9 in)
1957
33.2 mm (1.3 in)
1958
34.0 mm (1.3 in)
1959
15.6 mm (0.6 in)
1960
27.0 mm (1.1 in)
1961
25.6 mm (1.0 in)
1962
23.6 mm (0.9 in)
1963
28.1 mm (1.1 in)
1964
25.1 mm (1.0 in)
1965
27.8 mm (1.1 in)
1966
59.8 mm (2.4 in)
1967
30.8 mm (1.2 in)
1968
46.3 mm (1.8 in)
1969
55.3 mm (2.2 in)
1970
37.3 mm (1.5 in)
1971
21.6 mm (0.9 in)
1972
31.1 mm (1.2 in)
1973
31.1 mm (1.2 in)
1974
22.2 mm (0.9 in)
1975
26.8 mm (1.1 in)
1976
24.7 mm (1.0 in)
1977
20.3 mm (0.8 in)
1978
23.8 mm (0.9 in)
1979
22.6 mm (0.9 in)
1980
23.1 mm (0.9 in)
1981
54.9 mm (2.2 in)
1982
21.6 mm (0.9 in)
1983
24.7 mm (1.0 in)
1984
27.7 mm (1.1 in)
1985
30.2 mm (1.2 in)
1986
30.4 mm (1.2 in)
1987
26.6 mm (1.0 in)
1988
34.8 mm (1.4 in)
1989
35.8 mm (1.4 in)
1990
34.9 mm (1.4 in)
1991
20.9 mm (0.8 in)
1992
36.4 mm (1.4 in)
1993
37.7 mm (1.5 in)
1994
44.0 mm (1.7 in)
1995
25.5 mm (1.0 in)
1996
52.4 mm (2.1 in)
1997
23.1 mm (0.9 in)
1998
41.6 mm (1.6 in)
1999
22.8 mm (0.9 in)
2000
19.9 mm (0.8 in)
2001
41.2 mm (1.6 in)
2002
27.5 mm (1.1 in)
2003
21.6 mm (0.9 in)
2004
23.6 mm (0.9 in)
2005
25.7 mm (1.0 in)
2006
64.9 mm (2.6 in)
2007
26.6 mm (1.0 in)
2008
56.8 mm (2.2 in)
2009
34.7 mm (1.4 in)
2010
30.9 mm (1.2 in)
2011
52.4 mm (2.1 in)
2012
32.6 mm (1.3 in)
2013
41.1 mm (1.6 in)
2014
47.3 mm (1.9 in)
2015
26.6 mm (1.0 in)
2016
28.3 mm (1.1 in)
2017
43.1 mm (1.7 in)
2018
34.0 mm (1.3 in)
2019
36.4 mm (1.4 in)
2020
46.8 mm (1.8 in)
2021
26.2 mm (1.0 in)
2022
98.9 mm (3.9 in)
2023
37.3 mm (1.5 in)
2024
35.5 mm (1.4 in)
2025
36.3 mm (1.4 in)
2026
30.4 mm (1.2 in)
Wettest five days (Rx5day)
The wettest five days of the year at Helgoland, 1952 to 2026. The record is 159.3 mm (6.3 in) in 2008, marked on the chart; the median year is 59.4 mm (2.3 in).
Wettest five days (Rx5day) at Helgoland by year
Year
Wettest five days (Rx5day)
1952
61.1 mm (2.4 in)
1953
56.4 mm (2.2 in)
1954
72.4 mm (2.9 in)
1955
44.9 mm (1.8 in)
1956
48.5 mm (1.9 in)
1957
76.6 mm (3.0 in)
1958
66.3 mm (2.6 in)
1959
33.7 mm (1.3 in)
1960
74.8 mm (2.9 in)
1961
57.6 mm (2.3 in)
1962
49.3 mm (1.9 in)
1963
63.3 mm (2.5 in)
1964
42.0 mm (1.7 in)
1965
62.5 mm (2.5 in)
1966
80.5 mm (3.2 in)
1967
55.3 mm (2.2 in)
1968
57.6 mm (2.3 in)
1969
81.6 mm (3.2 in)
1970
82.6 mm (3.3 in)
1971
40.7 mm (1.6 in)
1972
75.6 mm (3.0 in)
1973
66.5 mm (2.6 in)
1974
62.0 mm (2.4 in)
1975
44.5 mm (1.8 in)
1976
58.6 mm (2.3 in)
1977
48.0 mm (1.9 in)
1978
51.0 mm (2.0 in)
1979
47.0 mm (1.9 in)
1980
56.7 mm (2.2 in)
1981
65.6 mm (2.6 in)
1982
55.4 mm (2.2 in)
1983
57.8 mm (2.3 in)
1984
54.8 mm (2.2 in)
1985
69.4 mm (2.7 in)
1986
72.2 mm (2.8 in)
1987
39.0 mm (1.5 in)
1988
61.3 mm (2.4 in)
1989
58.2 mm (2.3 in)
1990
81.6 mm (3.2 in)
1991
45.2 mm (1.8 in)
1992
105.6 mm (4.2 in)
1993
54.3 mm (2.1 in)
1994
80.9 mm (3.2 in)
1995
69.6 mm (2.7 in)
1996
60.4 mm (2.4 in)
1997
50.4 mm (2.0 in)
1998
82.7 mm (3.3 in)
1999
45.9 mm (1.8 in)
2000
33.3 mm (1.3 in)
2001
89.8 mm (3.5 in)
2002
49.0 mm (1.9 in)
2003
54.6 mm (2.1 in)
2004
49.6 mm (2.0 in)
2005
46.9 mm (1.8 in)
2006
110.6 mm (4.4 in)
2007
44.2 mm (1.7 in)
2008
159.3 mm (6.3 in)
2009
65.3 mm (2.6 in)
2010
50.8 mm (2.0 in)
2011
77.9 mm (3.1 in)
2012
64.9 mm (2.6 in)
2013
96.4 mm (3.8 in)
2014
100.4 mm (4.0 in)
2015
59.4 mm (2.3 in)
2016
52.3 mm (2.1 in)
2017
74.1 mm (2.9 in)
2018
49.0 mm (1.9 in)
2019
60.1 mm (2.4 in)
2020
105.1 mm (4.1 in)
2021
52.8 mm (2.1 in)
2022
103.6 mm (4.1 in)
2023
52.1 mm (2.1 in)
2024
66.3 mm (2.6 in)
2025
66.7 mm (2.6 in)
2026
44.5 mm (1.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Helgoland, 1952 to 2026. The record is 36 days in 1992, marked on the chart; the median year is 21 days.
Longest dry spell (CDD) at Helgoland by year
Year
Longest dry spell (CDD)
1952
15 days
1953
25 days
1954
21 days
1955
32 days
1956
19 days
1957
14 days
1958
18 days
1959
27 days
1960
34 days
1961
19 days
1962
25 days
1963
22 days
1964
24 days
1965
14 days
1966
16 days
1967
13 days
1968
20 days
1969
29 days
1970
22 days
1971
24 days
1972
22 days
1973
21 days
1974
34 days
1975
21 days
1976
29 days
1977
24 days
1978
18 days
1979
16 days
1980
22 days
1981
33 days
1982
20 days
1983
17 days
1984
25 days
1985
25 days
1986
34 days
1987
13 days
1988
16 days
1989
21 days
1990
19 days
1991
25 days
1992
36 days
1993
28 days
1994
20 days
1995
36 days
1996
30 days
1997
25 days
1998
19 days
1999
16 days
2000
13 days
2001
17 days
2002
23 days
2003
23 days
2004
20 days
2005
19 days
2006
19 days
2007
24 days
2008
23 days
2009
23 days
2010
20 days
2011
35 days
2012
25 days
2013
26 days
2014
18 days
2015
17 days
2016
17 days
2017
21 days
2018
36 days
2019
15 days
2020
28 days
2021
19 days
2022
19 days
2023
28 days
2024
15 days
2025
30 days
2026
15 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
54 years with a frost
Across 54 years with a frost, the median last spring frost at Helgoland falls on 13 March and the median first autumn frost on 9 December, which leaves a median of 265 days between them.
Fitted over all years, the growing season changes by +6.3 days per decade at this station.
Frost dates and growing season at Helgoland
Measure
Median, all years
Earliest period
Recent period (1983 to 2023)
Recent against earliest
Fitted trend
Last spring frost
13 March
n/a
2 March
n/a
-5.4 days per decade
First autumn frost
9 December
n/a
11 December
n/a
+0.9 days per decade
Growing days
265 days
n/a
283 days
n/a
+6.3 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
73 years, 1953 to 2025
A day with at least 30.5 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 84.9 mm (3.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Helgoland: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
30.5 mm (1.2 in)
5 years
40.9 mm (1.6 in)
10 years
49.2 mm (1.9 in)
25 years
61.6 mm (2.4 in)
50 years
72.5 mm (2.9 in)
100 years
84.9 mm (3.3 in)
Longer than the 73 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, 73 years of values from 1953 to 2025.
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: 98.9 mm (3.9 in) in 2022; 64.9 mm (2.6 in) in 2006; 59.8 mm (2.4 in) in 1966.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2010 to 2025 against 1961 to 1990
Over 2010 to 2025, Helgoland had a mean temperature of 10.6 C (51.1 F) and 811.8 mm (32.0 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Hastings (United Kingdom, 617 km away), Eastbourne (United Kingdom, 640 km away) and Bognor Regis (United Kingdom, 617 km away).
Climate twins of Helgoland: stations whose 1961 to 1990 climate is closest to its 2010 to 2025 climate
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
Download the Data
Data for Helgoland standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Helgoland 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.