Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Herten. 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 Herten, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
16.2 C (61.2 F)
-19.2 C (-2.6 F)
n/a
n/a
Feb
19.1 C (66.4 F)
-15.6 C (3.9 F)
n/a
n/a
Mar
24.3 C (75.7 F)
-10.6 C (12.9 F)
n/a
n/a
Apr
30.2 C (86.4 F)
-5.9 C (21.4 F)
n/a
n/a
May
33.6 C (92.5 F)
-2.5 C (27.5 F)
n/a
n/a
Jun
38.3 C (100.9 F)
2.0 C (35.6 F)
n/a
n/a
Jul
38.1 C (100.6 F)
4.0 C (39.2 F)
n/a
n/a
Aug
38.5 C (101.3 F)
5.2 C (41.4 F)
n/a
n/a
Sep
32.3 C (90.1 F)
1.2 C (34.2 F)
n/a
n/a
Oct
25.5 C (77.9 F)
-5.0 C (23.0 F)
n/a
n/a
Nov
20.5 C (68.9 F)
-8.2 C (17.2 F)
n/a
n/a
Dec
16.7 C (62.1 F)
-16.5 C (2.3 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Herten still stand. 1985 holds the most, with 75.
Standing records at Herten by the year they were set
Year set
Standing records
1976
52
1977
34
1978
42
1979
50
1980
52
1981
48
1982
19
1983
36
1984
30
1985
75
1986
60
1987
74
1988
25
1989
35
1990
43
1991
45
1992
32
1993
53
1994
41
1995
36
1996
63
1997
40
1998
47
1999
37
2000
40
2001
48
2002
41
2003
63
2004
28
2005
64
2006
64
2007
47
Wettest Day of Each Month
Jul: 79.1 mm (3.1 in)
The wettest day on record for each calendar month at Herten. The most was 79.1 mm (3.1 in) on 20 July 1980.
Record daily precipitation for each month at Herten
Month
Record daily precipitation (mm)
Date
Jan
48.9 mm (1.9 in)
29 January 1995
Feb
47.4 mm (1.9 in)
6 February 1984
Mar
30.5 mm (1.2 in)
6 March 1998
Apr
30.8 mm (1.2 in)
19 April 2005
May
60.4 mm (2.4 in)
28 May 1984
Jun
62.3 mm (2.5 in)
29 June 1981
Jul
79.1 mm (3.1 in)
20 July 1980
Aug
40.7 mm (1.6 in)
21 August 2007
Sep
48.5 mm (1.9 in)
24 September 1988
Oct
48.6 mm (1.9 in)
31 October 1998
Nov
33.0 mm (1.3 in)
30 November 1988
Dec
38.9 mm (1.5 in)
19 December 1991
Period of Record Coverage
1976 to 2007
Complete yearUnder 90 percent of days
32 years of record at Herten, 1976 to 2007. Every year has data for at least 90 percent of its days.
Cooler than the station meanWarmer than the station mean
One stripe for each of 32 complete years at Herten, 1976 to 2007. Blue stripes are years cooler than the station's own mean of 10.3 C (50.5 F); red stripes are warmer. The coolest year was 1985, at 8.6 C (47.5 F), and the warmest was 2000, at 11.8 C (53.3 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Herten as warming stripes, 1976 to 2007
Year
Annual mean temperature
Difference from the station mean
1976
10.0 C
-0.27 C
1977
10.0 C
-0.30 C
1978
9.1 C
-1.16 C
1979
8.8 C
-1.47 C
1980
9.3 C
-1.02 C
1981
9.4 C
-0.87 C
1982
10.4 C
+0.13 C
1983
10.3 C
-0.03 C
1984
9.6 C
-0.74 C
1985
8.6 C
-1.67 C
1986
9.2 C
-1.09 C
1987
8.9 C
-1.39 C
1988
10.4 C
+0.08 C
1989
10.9 C
+0.58 C
1990
10.9 C
+0.63 C
1991
9.8 C
-0.52 C
1992
10.7 C
+0.39 C
1993
9.9 C
-0.42 C
1994
10.9 C
+0.56 C
1995
10.5 C
+0.16 C
1996
8.6 C
-1.67 C
1997
10.4 C
+0.11 C
1998
10.6 C
+0.33 C
1999
11.6 C
+1.26 C
2000
11.8 C
+1.52 C
2001
11.2 C
+0.87 C
2002
11.5 C
+1.23 C
2003
11.4 C
+1.14 C
2004
10.6 C
+0.30 C
2005
11.2 C
+0.87 C
2006
11.5 C
+1.22 C
2007
11.6 C
+1.30 C
The annual mean temperature here has risen by 0.7 C (0.4 to 1.0) per decade over 1976 to 2007. In Fahrenheit: 1.3 F (0.8 to 1.8) per decade. The slope is a straight line fitted to 32 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Herten
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.7 C (0.4 to 1.0) per decade
1.3 F (0.8 to 1.8) per decade
1976 to 2007
32
Rise
Mean daily maximum
0.9 C (0.5 to 1.2) per decade
1.5 F (1.0 to 2.1) per decade
1976 to 2007
32
Rise
Mean daily minimum
0.6 C (0.3 to 0.8) per decade
1.0 F (0.6 to 1.5) per decade
1976 to 2007
32
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
1976 to 2007
Yearly extremes at Herten: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.5 C (101.3 F)
2003
33.3 C (92.0 F)
32
Coldest night (TNn)
-19.2 C (-2.6 F)
1985
-10.5 C (13.1 F)
32
Wettest day (Rx1day)
79.1 mm (3.1 in)
1980
33.1 mm (1.3 in)
32
Wettest five days (Rx5day)
103.3 mm (4.1 in)
1980
67.0 mm (2.6 in)
32
Longest dry spell (CDD)
44 days
2007
17 days
32
Hottest day (TXx)
The hottest day of the year at Herten, 1976 to 2007. The record is 38.5 C (101.3 F) in 2003, marked on the chart; the median year is 33.3 C (92.0 F).
Hottest day (TXx) at Herten by year
Year
Hottest day (TXx)
1976
34.5 C (94.1 F)
1977
30.1 C (86.2 F)
1978
32.0 C (89.6 F)
1979
29.8 C (85.6 F)
1980
30.5 C (86.9 F)
1981
31.0 C (87.8 F)
1982
31.6 C (88.9 F)
1983
33.4 C (92.1 F)
1984
33.1 C (91.6 F)
1985
31.0 C (87.8 F)
1986
34.2 C (93.6 F)
1987
31.7 C (89.1 F)
1988
28.5 C (83.3 F)
1989
30.6 C (87.1 F)
1990
34.6 C (94.3 F)
1991
32.7 C (90.9 F)
1992
33.0 C (91.4 F)
1993
29.2 C (84.6 F)
1994
36.0 C (96.8 F)
1995
33.3 C (91.9 F)
1996
34.3 C (93.7 F)
1997
32.0 C (89.6 F)
1998
33.5 C (92.3 F)
1999
33.8 C (92.8 F)
2000
36.2 C (97.2 F)
2001
36.2 C (97.2 F)
2002
38.3 C (100.9 F)
2003
38.5 C (101.3 F)
2004
34.0 C (93.2 F)
2005
33.8 C (92.8 F)
2006
38.1 C (100.6 F)
2007
35.0 C (95.0 F)
Coldest night (TNn)
The coldest night of the year at Herten, 1976 to 2007. The record is -19.2 C (-2.6 F) in 1985, marked on the chart; the median year is -10.5 C (13.1 F).
Coldest night (TNn) at Herten by year
Year
Coldest night (TNn)
1976
-13.2 C (8.2 F)
1977
-7.0 C (19.4 F)
1978
-16.5 C (2.3 F)
1979
-17.2 C (1.0 F)
1980
-10.5 C (13.1 F)
1981
-10.5 C (13.1 F)
1982
-15.0 C (5.0 F)
1983
-7.5 C (18.5 F)
1984
-6.6 C (20.1 F)
1985
-19.2 C (-2.6 F)
1986
-15.6 C (3.9 F)
1987
-16.2 C (2.8 F)
1988
-8.0 C (17.6 F)
1989
-5.8 C (21.6 F)
1990
-3.3 C (26.1 F)
1991
-12.6 C (9.3 F)
1992
-9.0 C (15.8 F)
1993
-11.8 C (10.8 F)
1994
-10.9 C (12.4 F)
1995
-11.0 C (12.2 F)
1996
-15.6 C (3.9 F)
1997
-18.4 C (-1.1 F)
1998
-11.0 C (12.2 F)
1999
-7.9 C (17.8 F)
2000
-8.0 C (17.6 F)
2001
-8.2 C (17.2 F)
2002
-10.5 C (13.1 F)
2003
-12.5 C (9.5 F)
2004
-8.4 C (16.9 F)
2005
-10.5 C (13.1 F)
2006
-8.1 C (17.4 F)
2007
-6.1 C (21.0 F)
Wettest day (Rx1day)
The wettest day of the year at Herten, 1976 to 2007. The record is 79.1 mm (3.1 in) in 1980, marked on the chart; the median year is 33.1 mm (1.3 in).
Wettest day (Rx1day) at Herten by year
Year
Wettest day (Rx1day)
1976
51.4 mm (2.0 in)
1977
27.7 mm (1.1 in)
1978
30.0 mm (1.2 in)
1979
32.2 mm (1.3 in)
1980
79.1 mm (3.1 in)
1981
62.3 mm (2.5 in)
1982
26.0 mm (1.0 in)
1983
25.3 mm (1.0 in)
1984
60.4 mm (2.4 in)
1985
29.6 mm (1.2 in)
1986
49.4 mm (1.9 in)
1987
47.6 mm (1.9 in)
1988
48.5 mm (1.9 in)
1989
30.8 mm (1.2 in)
1990
36.4 mm (1.4 in)
1991
38.9 mm (1.5 in)
1992
27.1 mm (1.1 in)
1993
35.4 mm (1.4 in)
1994
31.7 mm (1.2 in)
1995
48.9 mm (1.9 in)
1996
40.3 mm (1.6 in)
1997
21.7 mm (0.9 in)
1998
48.6 mm (1.9 in)
1999
22.8 mm (0.9 in)
2000
26.4 mm (1.0 in)
2001
20.9 mm (0.8 in)
2002
40.2 mm (1.6 in)
2003
30.0 mm (1.2 in)
2004
33.9 mm (1.3 in)
2005
30.8 mm (1.2 in)
2006
26.0 mm (1.0 in)
2007
40.7 mm (1.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Herten, 1976 to 2007. The record is 103.3 mm (4.1 in) in 1980, marked on the chart; the median year is 67.0 mm (2.6 in).
Wettest five days (Rx5day) at Herten by year
Year
Wettest five days (Rx5day)
1976
64.4 mm (2.5 in)
1977
55.7 mm (2.2 in)
1978
61.7 mm (2.4 in)
1979
73.9 mm (2.9 in)
1980
103.3 mm (4.1 in)
1981
102.5 mm (4.0 in)
1982
39.8 mm (1.6 in)
1983
62.4 mm (2.5 in)
1984
85.3 mm (3.4 in)
1985
60.4 mm (2.4 in)
1986
82.1 mm (3.2 in)
1987
74.9 mm (2.9 in)
1988
70.1 mm (2.8 in)
1989
74.0 mm (2.9 in)
1990
58.9 mm (2.3 in)
1991
80.5 mm (3.2 in)
1992
67.9 mm (2.7 in)
1993
58.8 mm (2.3 in)
1994
74.4 mm (2.9 in)
1995
100.8 mm (4.0 in)
1996
81.2 mm (3.2 in)
1997
45.2 mm (1.8 in)
1998
100.8 mm (4.0 in)
1999
50.2 mm (2.0 in)
2000
51.9 mm (2.0 in)
2001
53.5 mm (2.1 in)
2002
66.1 mm (2.6 in)
2003
90.5 mm (3.6 in)
2004
61.8 mm (2.4 in)
2005
66.0 mm (2.6 in)
2006
58.9 mm (2.3 in)
2007
73.8 mm (2.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Herten, 1976 to 2007. The record is 44 days in 2007, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Herten by year
Year
Longest dry spell (CDD)
1976
25 days
1977
17 days
1978
15 days
1979
14 days
1980
20 days
1981
22 days
1982
16 days
1983
17 days
1984
21 days
1985
20 days
1986
27 days
1987
12 days
1988
17 days
1989
19 days
1990
22 days
1991
26 days
1992
15 days
1993
16 days
1994
18 days
1995
17 days
1996
22 days
1997
20 days
1998
16 days
1999
16 days
2000
16 days
2001
14 days
2002
14 days
2003
20 days
2004
14 days
2005
19 days
2006
14 days
2007
44 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
32 years with a frost
Across 32 years with a frost, the median last spring frost at Herten falls on 19 April and the median first autumn frost on 3 November, which leaves a median of 200 days between them.
Fitted over all years, the growing season changes by +2.6 days per decade at this station.
Frost dates and growing season at Herten
Measure
Median, all years
Earliest period
Recent period (1978 to 2007)
Recent against earliest
Fitted trend
Last spring frost
19 April
n/a
19 April
n/a
-2.7 days per decade
First autumn frost
3 November
n/a
1 November
n/a
-0.1 days per decade
Growing days
200 days
n/a
198 days
n/a
+2.6 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
32 years, 1976 to 2007
A day with at least 34.4 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 88.2 mm (3.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Herten: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
34.4 mm (1.4 in)
5 years
46.1 mm (1.8 in)
10 years
54.8 mm (2.2 in)
25 years
67.1 mm (2.6 in)
50 years
77.2 mm (3.0 in)
Longer than the 32 years of record
100 years
88.2 mm (3.5 in)
Longer than the 32 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, 32 years of values from 1976 to 2007.
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: 79.1 mm (3.1 in) in 1980; 62.3 mm (2.5 in) in 1981; 60.4 mm (2.4 in) in 1984.
Download the Data
Data for Herten standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Herten 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.