Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Groningen. 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 Groningen, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
12.4 C (54.3 F)
-15.9 C (3.4 F)
n/a
n/a
Feb
15.6 C (60.1 F)
-19.0 C (-2.2 F)
n/a
n/a
Mar
22.3 C (72.1 F)
-12.1 C (10.2 F)
n/a
n/a
Apr
26.9 C (80.4 F)
-4.6 C (23.7 F)
n/a
n/a
May
33.7 C (92.7 F)
-1.4 C (29.5 F)
n/a
n/a
Jun
34.6 C (94.3 F)
3.2 C (37.8 F)
n/a
n/a
Jul
35.5 C (95.9 F)
3.7 C (38.7 F)
n/a
n/a
Aug
36.8 C (98.2 F)
4.6 C (40.3 F)
n/a
n/a
Sep
33.0 C (91.4 F)
1.3 C (34.3 F)
n/a
n/a
Oct
26.7 C (80.1 F)
-4.6 C (23.7 F)
n/a
n/a
Nov
17.9 C (64.2 F)
-10.1 C (13.8 F)
n/a
n/a
Dec
12.7 C (54.9 F)
-20.3 C (-4.5 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Groningen still stand. 1947 holds the most, with 71.
Standing records at Groningen by the year they were set
Year set
Standing records
1906
28
1907
30
1908
32
1909
24
1910
19
1911
30
1912
40
1913
34
1914
29
1915
31
1916
25
1917
34
1918
22
1919
57
1920
35
1921
52
1922
37
1923
46
1924
24
1925
36
1926
24
1927
23
1928
29
1929
47
1930
20
1931
27
1932
25
1933
19
1934
23
1935
17
1936
24
1937
19
1938
63
1939
24
1940
40
1941
45
1942
50
1943
19
1944
29
1945
30
1946
14
1947
71
1948
31
1949
29
1950
20
1951
37
All-Time Record Progression
3 new records
3 all-time records were set at Groningen between 10 July 1941 and 23 August 1944. Each dot is a new record.
When Groningen set new all-time records
Date
Kind
Detail
1941-07-10
Record high minimum temperature
Record high minimum temperature 20.8 C (69.4 F)
1942-01-26
Record low maximum temperature
Record low maximum temperature -12.8 C (9.0 F)
1944-08-23
Record high maximum temperature
Record high maximum temperature 36.8 C (98.2 F)
Period of Record Coverage
1906 to 1952
Complete yearUnder 90 percent of days
47 years of record at Groningen, 1906 to 1952. 2 years have data for under 90 percent of days and are left out of rankings: 1906, 1952.
Cooler than the station meanWarmer than the station mean
One stripe for each of 45 complete years at Groningen, 1907 to 1951. Blue stripes are years cooler than the station's own mean of 8.9 C (48.0 F); red stripes are warmer. The coolest year was 1940, at 7.5 C (45.5 F), and the warmest was 1934, at 10.1 C (50.1 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Groningen as warming stripes, 1907 to 1951
Year
Annual mean temperature
Difference from the station mean
1907
8.3 C
-0.65 C
1908
8.3 C
-0.61 C
1909
7.9 C
-1.04 C
1910
9.2 C
+0.30 C
1911
9.6 C
+0.72 C
1912
8.7 C
-0.22 C
1913
9.3 C
+0.43 C
1914
9.5 C
+0.61 C
1915
8.3 C
-0.65 C
1916
8.7 C
-0.19 C
1917
8.1 C
-0.78 C
1918
9.1 C
+0.15 C
1919
7.6 C
-1.35 C
1920
9.1 C
+0.23 C
1921
9.8 C
+0.86 C
1922
7.8 C
-1.07 C
1923
8.2 C
-0.71 C
1924
8.3 C
-0.66 C
1925
9.1 C
+0.15 C
1926
9.4 C
+0.45 C
1927
8.6 C
-0.27 C
1928
8.9 C
+0.02 C
1929
7.9 C
-1.05 C
1930
9.4 C
+0.47 C
1931
8.6 C
-0.28 C
1932
9.3 C
+0.36 C
1933
9.0 C
+0.04 C
1934
10.1 C
+1.17 C
1935
9.4 C
+0.44 C
1936
9.3 C
+0.37 C
1937
9.2 C
+0.33 C
1938
9.7 C
+0.74 C
1939
9.3 C
+0.39 C
1940
7.5 C
-1.41 C
1941
8.1 C
-0.82 C
1942
7.8 C
-1.10 C
1943
9.6 C
+0.67 C
1944
9.4 C
+0.46 C
1945
9.9 C
+0.94 C
1946
8.9 C
+0.03 C
1947
9.1 C
+0.18 C
1948
9.8 C
+0.92 C
1949
10.0 C
+1.12 C
1950
9.3 C
+0.36 C
1951
8.9 C
-0.05 C
The annual mean temperature here has risen by 0.16 C (0.01 to 0.31) per decade over 1907 to 1951. In Fahrenheit: 0.29 F (0.01 to 0.57) per decade. The slope is a straight line fitted to 45 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Groningen
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.16 C (0.01 to 0.31) per decade
0.29 F (0.01 to 0.57) per decade
1907 to 1951
45
Rise
Mean daily maximum
0.13 C (-0.04 to 0.29) per decade
0.2 F (-0.1 to 0.5) per decade
1907 to 1951
45
Not clearly different from zero
Mean daily minimum
0.19 C (0.03 to 0.35) per decade
0.3 F (0.1 to 0.6) per decade
1907 to 1951
45
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
1906 to 1952
Yearly extremes at Groningen: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.8 C (98.2 F)
1944
31.3 C (88.3 F)
47
Coldest night (TNn)
-20.3 C (-4.5 F)
1923
-10.6 C (12.9 F)
47
Hottest day (TXx)
The hottest day of the year at Groningen, 1906 to 1952. The record is 36.8 C (98.2 F) in 1944, marked on the chart; the median year is 31.3 C (88.3 F).
Hottest day (TXx) at Groningen by year
Year
Hottest day (TXx)
1906
30.6 C (87.1 F)
1907
31.4 C (88.5 F)
1908
28.7 C (83.7 F)
1909
28.4 C (83.1 F)
1910
30.1 C (86.2 F)
1911
35.5 C (95.9 F)
1912
31.8 C (89.2 F)
1913
27.8 C (82.0 F)
1914
30.5 C (86.9 F)
1915
33.3 C (91.9 F)
1916
29.8 C (85.6 F)
1917
32.8 C (91.0 F)
1918
29.4 C (84.9 F)
1919
31.2 C (88.2 F)
1920
27.8 C (82.0 F)
1921
32.7 C (90.9 F)
1922
33.7 C (92.7 F)
1923
34.1 C (93.4 F)
1924
29.0 C (84.2 F)
1925
32.9 C (91.2 F)
1926
30.4 C (86.7 F)
1927
29.7 C (85.5 F)
1928
31.5 C (88.7 F)
1929
31.3 C (88.3 F)
1930
32.4 C (90.3 F)
1931
30.9 C (87.6 F)
1932
34.2 C (93.6 F)
1933
30.0 C (86.0 F)
1934
30.8 C (87.4 F)
1935
31.2 C (88.2 F)
1936
30.9 C (87.6 F)
1937
31.4 C (88.5 F)
1938
31.0 C (87.8 F)
1939
30.6 C (87.1 F)
1940
27.2 C (81.0 F)
1941
35.0 C (95.0 F)
1942
32.3 C (90.1 F)
1943
32.3 C (90.1 F)
1944
36.8 C (98.2 F)
1945
32.5 C (90.5 F)
1946
34.2 C (93.6 F)
1947
34.6 C (94.3 F)
1948
33.6 C (92.5 F)
1949
33.0 C (91.4 F)
1950
31.4 C (88.5 F)
1951
27.7 C (81.9 F)
1952
9.3 C (48.7 F)
Coldest night (TNn)
The coldest night of the year at Groningen, 1906 to 1952. The record is -20.3 C (-4.5 F) in 1923, marked on the chart; the median year is -10.6 C (12.9 F).
Coldest night (TNn) at Groningen by year
Year
Coldest night (TNn)
1906
-13.4 C (7.9 F)
1907
-13.2 C (8.2 F)
1908
-13.6 C (7.5 F)
1909
-9.8 C (14.4 F)
1910
-6.7 C (19.9 F)
1911
-5.7 C (21.7 F)
1912
-16.2 C (2.8 F)
1913
-6.7 C (19.9 F)
1914
-9.2 C (15.4 F)
1915
-10.1 C (13.8 F)
1916
-4.7 C (23.5 F)
1917
-13.3 C (8.1 F)
1918
-6.6 C (20.1 F)
1919
-13.1 C (8.4 F)
1920
-10.6 C (12.9 F)
1921
-11.9 C (10.6 F)
1922
-13.9 C (7.0 F)
1923
-20.3 C (-4.5 F)
1924
-11.6 C (11.1 F)
1925
-16.1 C (3.0 F)
1926
-13.4 C (7.9 F)
1927
-14.9 C (5.2 F)
1928
-6.2 C (20.8 F)
1929
-18.7 C (-1.7 F)
1930
-5.4 C (22.3 F)
1931
-9.5 C (14.9 F)
1932
-8.0 C (17.6 F)
1933
-12.1 C (10.2 F)
1934
-5.0 C (23.0 F)
1935
-8.4 C (16.9 F)
1936
-8.5 C (16.7 F)
1937
-8.9 C (16.0 F)
1938
-14.3 C (6.3 F)
1939
-10.4 C (13.3 F)
1940
-19.0 C (-2.2 F)
1941
-12.9 C (8.8 F)
1942
-15.9 C (3.4 F)
1943
-9.0 C (15.8 F)
1944
-5.8 C (21.6 F)
1945
-15.2 C (4.6 F)
1946
-12.9 C (8.8 F)
1947
-15.3 C (4.5 F)
1948
-9.7 C (14.5 F)
1949
-7.0 C (19.4 F)
1950
-10.6 C (12.9 F)
1951
-6.6 C (20.1 F)
1952
-4.7 C (23.5 F)
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
45 years with a frost
Across 45 years with a frost, the median last spring frost at Groningen falls on 15 April and the median first autumn frost on 3 November, which leaves a median of 203 days between them.
Fitted over all years, the growing season changes by +7.8 days per decade at this station.
Frost dates and growing season at Groningen
Measure
Median, all years
Earliest period
Recent period (1922 to 1951)
Recent against earliest
Fitted trend
Last spring frost
15 April
n/a
12 April
n/a
-6.1 days per decade
First autumn frost
3 November
n/a
4 November
n/a
+1.6 days per decade
Growing days
203 days
n/a
210 days
n/a
+7.8 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.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Groningen standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Groningen 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.