Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Rosthern. 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 Rosthern, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
6.1 C (43.0 F)
-50.6 C (-59.1 F)
n/a
n/a
Feb
6.7 C (44.1 F)
-44.4 C (-47.9 F)
n/a
n/a
Mar
16.7 C (62.1 F)
-40.0 C (-40.0 F)
n/a
n/a
Apr
31.1 C (88.0 F)
-27.2 C (-17.0 F)
n/a
n/a
May
36.1 C (97.0 F)
-9.4 C (15.1 F)
n/a
n/a
Jun
38.9 C (102.0 F)
-4.4 C (24.1 F)
n/a
n/a
Jul
39.4 C (102.9 F)
-0.6 C (30.9 F)
n/a
n/a
Aug
37.2 C (99.0 F)
-1.1 C (30.0 F)
n/a
n/a
Sep
36.1 C (97.0 F)
-13.3 C (8.1 F)
n/a
n/a
Oct
29.4 C (84.9 F)
-24.4 C (-11.9 F)
n/a
n/a
Nov
16.7 C (62.1 F)
-35.0 C (-31.0 F)
n/a
n/a
Dec
9.4 C (48.9 F)
-46.1 C (-51.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Rosthern still stand. 1919 holds the most, with 62.
Standing records at Rosthern by the year they were set
Year set
Standing records
1911
58
1912
37
1913
35
1914
30
1915
32
1916
28
1917
56
1918
48
1919
62
1920
25
1921
45
1922
23
1923
37
1924
31
1925
28
1926
35
1927
27
1928
43
1929
22
1930
31
1931
37
1932
29
1933
13
1934
43
1935
39
1936
58
1937
27
1938
23
1939
42
1940
6
1954
20
1955
26
1956
39
1957
21
1958
25
1959
27
1960
15
1961
26
1962
23
1963
24
1964
17
1965
20
1966
24
1967
24
1968
45
1969
35
1970
3
All-Time Record Progression
2 new records
2 all-time records were set at Rosthern between 6 August 1961 and 1 July 1962. Each dot is a new record.
When Rosthern set new all-time records
Date
Kind
Detail
1961-08-06
Record high minimum temperature
Record high minimum temperature 21.7 C (71.1 F)
1962-07-01
Record daily precipitation
Record daily precipitation 154.7 mm (6.1 in)
Wettest Day of Each Month
Jul: 154.7 mm (6.1 in)
The wettest day on record for each calendar month at Rosthern. The most was 154.7 mm (6.1 in) on 1 July 1962.
Record daily precipitation for each month at Rosthern
Month
Record daily precipitation (mm)
Date
Jan
15.2 mm (0.6 in)
19 January 1911
Feb
16.5 mm (0.6 in)
15 February 1921
Mar
45.7 mm (1.8 in)
1 March 1932
Apr
38.1 mm (1.5 in)
6 April 1929
May
35.6 mm (1.4 in)
30 May 1968
Jun
51.1 mm (2.0 in)
30 June 1931
Jul
154.7 mm (6.1 in)
1 July 1962
Aug
54.9 mm (2.2 in)
21 August 1924
Sep
40.9 mm (1.6 in)
5 September 1925
Oct
35.6 mm (1.4 in)
15 October 1930
Nov
14.2 mm (0.6 in)
22 November 1939
Dec
20.3 mm (0.8 in)
5 December 1929
Period of Record Coverage
1910 to 1970
Complete yearUnder 90 percent of days
48 years of record at Rosthern, 1910 to 1970. 5 years have data for under 90 percent of days and are left out of rankings: 1910, 1940, 1954, 1961, 1970.
Cooler than the station meanWarmer than the station mean
One stripe for each of 42 complete years at Rosthern, 1911 to 1969. Blue stripes are years cooler than the station's own mean of 1.0 C (33.9 F); red stripes are warmer. The coolest year was 1911, at -1.3 C (29.7 F), and the warmest was 1931, at 4.0 C (39.3 F). The strongest colour marks a difference of 3.0 C (5.4 F).
Annual mean temperature at Rosthern as warming stripes, 1911 to 1969
Year
Annual mean temperature
Difference from the station mean
1911
-1.3 C
-2.31 C
1912
-0.2 C
-1.25 C
1913
-0.5 C
-1.50 C
1914
0.7 C
-0.39 C
1915
1.3 C
+0.29 C
1916
-0.8 C
-1.87 C
1917
-0.7 C
-1.73 C
1918
1.3 C
+0.27 C
1919
0.6 C
-0.41 C
1920
1.6 C
+0.53 C
1921
1.3 C
+0.28 C
1922
1.2 C
+0.19 C
1923
1.6 C
+0.56 C
1924
0.8 C
-0.20 C
1925
1.3 C
+0.21 C
1926
2.0 C
+0.94 C
1927
-0.2 C
-1.27 C
1928
2.6 C
+1.56 C
1929
0.2 C
-0.81 C
1930
2.1 C
+1.05 C
1931
4.0 C
+2.99 C
1932
0.8 C
-0.29 C
1933
0.3 C
-0.70 C
1934
2.6 C
+1.58 C
1935
0.1 C
-0.96 C
1937
0.7 C
-0.35 C
1938
2.4 C
+1.34 C
1939
1.8 C
+0.74 C
1955
-0.4 C
-1.46 C
1956
0.5 C
-0.59 C
1957
1.4 C
+0.36 C
1958
2.0 C
+0.99 C
1959
1.2 C
+0.20 C
1960
1.5 C
+0.44 C
1962
1.9 C
+0.82 C
1963
2.4 C
+1.31 C
1964
1.7 C
+0.61 C
1965
0.3 C
-0.76 C
1966
0.3 C
-0.76 C
1967
1.1 C
+0.01 C
1968
1.9 C
+0.83 C
1969
0.6 C
-0.40 C
The fitted trend in annual mean temperature here over 1911 to 1969 is 0.13 C (-0.04 to 0.31) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.2 F (-0.1 to 0.5) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Rosthern
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.13 C (-0.04 to 0.31) per decade
0.2 F (-0.1 to 0.5) per decade
1911 to 1969
42
Not clearly different from zero
Mean daily maximum
0.04 C (-0.15 to 0.23) per decade
0.1 F (-0.3 to 0.4) per decade
1911 to 1969
42
Not clearly different from zero
Mean daily minimum
0.2 C (0.1 to 0.4) per decade
0.4 F (0.1 to 0.7) per decade
1911 to 1969
42
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
1910 to 1970
Yearly extremes at Rosthern: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
39.4 C (102.9 F)
1937
34.2 C (93.5 F)
48
Coldest night (TNn)
-50.6 C (-59.1 F)
1916
-40.8 C (-41.5 F)
48
Wettest day (Rx1day)
154.7 mm (6.1 in)
1962
32.0 mm (1.3 in)
48
Wettest five days (Rx5day)
155.0 mm (6.1 in)
1962
54.0 mm (2.1 in)
48
Longest dry spell (CDD)
48 days
1932
30 days
48
Hottest day (TXx)
The hottest day of the year at Rosthern, 1910 to 1970. The record is 39.4 C (102.9 F) in 1937, marked on the chart; the median year is 34.2 C (93.5 F).
Hottest day (TXx) at Rosthern by year
Year
Hottest day (TXx)
1910
2.2 C (36.0 F)
1911
31.1 C (88.0 F)
1912
34.4 C (93.9 F)
1913
30.0 C (86.0 F)
1914
34.4 C (93.9 F)
1915
34.4 C (93.9 F)
1916
30.6 C (87.1 F)
1917
31.7 C (89.1 F)
1918
37.2 C (99.0 F)
1919
38.9 C (102.0 F)
1920
35.0 C (95.0 F)
1921
32.8 C (91.0 F)
1922
36.1 C (97.0 F)
1923
32.8 C (91.0 F)
1924
32.8 C (91.0 F)
1925
33.3 C (91.9 F)
1926
35.6 C (96.1 F)
1927
31.1 C (88.0 F)
1928
33.9 C (93.0 F)
1929
33.3 C (91.9 F)
1930
35.0 C (95.0 F)
1931
36.7 C (98.1 F)
1932
31.1 C (88.0 F)
1933
36.1 C (97.0 F)
1934
33.9 C (93.0 F)
1935
33.9 C (93.0 F)
1936
36.1 C (97.0 F)
1937
39.4 C (102.9 F)
1938
34.4 C (93.9 F)
1939
35.0 C (95.0 F)
1940
32.2 C (90.0 F)
1954
30.0 C (86.0 F)
1955
36.7 C (98.1 F)
1956
35.6 C (96.1 F)
1957
36.7 C (98.1 F)
1958
33.3 C (91.9 F)
1959
37.8 C (100.0 F)
1960
32.8 C (91.0 F)
1961
37.2 C (99.0 F)
1962
35.0 C (95.0 F)
1963
32.2 C (90.0 F)
1964
37.2 C (99.0 F)
1965
32.2 C (90.0 F)
1966
33.3 C (91.9 F)
1967
36.1 C (97.0 F)
1968
34.4 C (93.9 F)
1969
33.9 C (93.0 F)
1970
28.3 C (82.9 F)
Coldest night (TNn)
The coldest night of the year at Rosthern, 1910 to 1970. The record is -50.6 C (-59.1 F) in 1916, marked on the chart; the median year is -40.8 C (-41.5 F).
Coldest night (TNn) at Rosthern by year
Year
Coldest night (TNn)
1910
-33.3 C (-27.9 F)
1911
-42.8 C (-45.0 F)
1912
-47.8 C (-54.0 F)
1913
-45.6 C (-50.1 F)
1914
-44.4 C (-47.9 F)
1915
-43.3 C (-45.9 F)
1916
-50.6 C (-59.1 F)
1917
-46.1 C (-51.0 F)
1918
-42.8 C (-45.0 F)
1919
-42.8 C (-45.0 F)
1920
-42.8 C (-45.0 F)
1921
-40.0 C (-40.0 F)
1922
-42.8 C (-45.0 F)
1923
-40.0 C (-40.0 F)
1924
-40.6 C (-41.1 F)
1925
-36.7 C (-34.1 F)
1926
-35.6 C (-32.1 F)
1927
-42.8 C (-45.0 F)
1928
-41.1 C (-42.0 F)
1929
-42.2 C (-44.0 F)
1930
-45.6 C (-50.1 F)
1931
-30.0 C (-22.0 F)
1932
-40.0 C (-40.0 F)
1933
-41.1 C (-42.0 F)
1934
-43.3 C (-45.9 F)
1935
-45.0 C (-49.0 F)
1936
-44.4 C (-47.9 F)
1937
-43.9 C (-47.0 F)
1938
-40.6 C (-41.1 F)
1939
-40.6 C (-41.1 F)
1940
-38.9 C (-38.0 F)
1954
-31.1 C (-24.0 F)
1955
-37.2 C (-35.0 F)
1956
-41.7 C (-43.1 F)
1957
-34.4 C (-29.9 F)
1958
-37.2 C (-35.0 F)
1959
-40.6 C (-41.1 F)
1960
-33.9 C (-29.0 F)
1961
-35.6 C (-32.1 F)
1962
-40.0 C (-40.0 F)
1963
-36.7 C (-34.1 F)
1964
-35.0 C (-31.0 F)
1965
-38.9 C (-38.0 F)
1966
-43.9 C (-47.0 F)
1967
-40.0 C (-40.0 F)
1968
-41.1 C (-42.0 F)
1969
-43.3 C (-45.9 F)
1970
-39.4 C (-38.9 F)
Wettest day (Rx1day)
The wettest day of the year at Rosthern, 1910 to 1970. The record is 154.7 mm (6.1 in) in 1962, marked on the chart; the median year is 32.0 mm (1.3 in).
Wettest day (Rx1day) at Rosthern by year
Year
Wettest day (Rx1day)
1910
12.7 mm (0.5 in)
1911
31.8 mm (1.3 in)
1912
32.0 mm (1.3 in)
1913
37.6 mm (1.5 in)
1914
30.0 mm (1.2 in)
1915
22.1 mm (0.9 in)
1916
24.4 mm (1.0 in)
1917
24.1 mm (0.9 in)
1918
35.6 mm (1.4 in)
1919
25.1 mm (1.0 in)
1920
49.0 mm (1.9 in)
1921
28.2 mm (1.1 in)
1922
30.2 mm (1.2 in)
1923
38.6 mm (1.5 in)
1924
54.9 mm (2.2 in)
1925
40.9 mm (1.6 in)
1926
16.5 mm (0.6 in)
1927
49.0 mm (1.9 in)
1928
81.0 mm (3.2 in)
1929
38.1 mm (1.5 in)
1930
35.6 mm (1.4 in)
1931
51.1 mm (2.0 in)
1932
45.7 mm (1.8 in)
1933
21.6 mm (0.9 in)
1934
33.0 mm (1.3 in)
1935
27.4 mm (1.1 in)
1936
30.5 mm (1.2 in)
1937
92.2 mm (3.6 in)
1938
29.7 mm (1.2 in)
1939
23.9 mm (0.9 in)
1940
26.9 mm (1.1 in)
1954
47.8 mm (1.9 in)
1955
33.3 mm (1.3 in)
1956
31.0 mm (1.2 in)
1957
25.4 mm (1.0 in)
1958
66.3 mm (2.6 in)
1959
32.3 mm (1.3 in)
1960
40.9 mm (1.6 in)
1961
12.7 mm (0.5 in)
1962
154.7 mm (6.1 in)
1963
36.8 mm (1.4 in)
1964
22.6 mm (0.9 in)
1965
20.1 mm (0.8 in)
1966
32.0 mm (1.3 in)
1967
22.1 mm (0.9 in)
1968
61.5 mm (2.4 in)
1969
44.5 mm (1.8 in)
1970
25.4 mm (1.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Rosthern, 1910 to 1970. The record is 155.0 mm (6.1 in) in 1962, marked on the chart; the median year is 54.0 mm (2.1 in).
Wettest five days (Rx5day) at Rosthern by year
Year
Wettest five days (Rx5day)
1910
15.2 mm (0.6 in)
1911
63.3 mm (2.5 in)
1912
65.0 mm (2.6 in)
1913
64.5 mm (2.5 in)
1914
33.0 mm (1.3 in)
1915
22.6 mm (0.9 in)
1916
56.7 mm (2.2 in)
1917
34.1 mm (1.3 in)
1918
38.9 mm (1.5 in)
1919
35.5 mm (1.4 in)
1920
57.7 mm (2.3 in)
1921
57.6 mm (2.3 in)
1922
48.7 mm (1.9 in)
1923
64.8 mm (2.6 in)
1924
62.3 mm (2.5 in)
1925
62.5 mm (2.5 in)
1926
32.0 mm (1.3 in)
1927
66.3 mm (2.6 in)
1928
82.3 mm (3.2 in)
1929
50.5 mm (2.0 in)
1930
68.6 mm (2.7 in)
1931
54.4 mm (2.1 in)
1932
53.9 mm (2.1 in)
1933
39.8 mm (1.6 in)
1934
54.3 mm (2.1 in)
1935
60.1 mm (2.4 in)
1936
43.4 mm (1.7 in)
1937
93.0 mm (3.7 in)
1938
48.5 mm (1.9 in)
1939
54.1 mm (2.1 in)
1940
34.9 mm (1.4 in)
1954
55.0 mm (2.2 in)
1955
39.9 mm (1.6 in)
1956
31.0 mm (1.2 in)
1957
35.0 mm (1.4 in)
1958
68.3 mm (2.7 in)
1959
59.7 mm (2.4 in)
1960
58.7 mm (2.3 in)
1961
21.6 mm (0.9 in)
1962
155.0 mm (6.1 in)
1963
53.0 mm (2.1 in)
1964
31.8 mm (1.3 in)
1965
47.5 mm (1.9 in)
1966
46.0 mm (1.8 in)
1967
35.9 mm (1.4 in)
1968
80.9 mm (3.2 in)
1969
73.1 mm (2.9 in)
1970
25.4 mm (1.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Rosthern, 1910 to 1970. The record is 48 days in 1932, marked on the chart; the median year is 30 days.
Longest dry spell (CDD) at Rosthern by year
Year
Longest dry spell (CDD)
1910
27 days
1911
39 days
1912
38 days
1913
32 days
1914
43 days
1915
29 days
1916
32 days
1917
27 days
1918
42 days
1919
22 days
1920
21 days
1921
20 days
1922
23 days
1923
28 days
1924
27 days
1925
24 days
1926
33 days
1927
28 days
1928
44 days
1929
31 days
1930
31 days
1931
34 days
1932
48 days
1933
23 days
1934
46 days
1935
37 days
1936
30 days
1937
24 days
1938
33 days
1939
25 days
1940
30 days
1954
31 days
1955
19 days
1956
41 days
1957
18 days
1958
28 days
1959
40 days
1960
30 days
1961
28 days
1962
28 days
1963
22 days
1964
39 days
1965
40 days
1966
22 days
1967
32 days
1968
15 days
1969
29 days
1970
23 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
42 years with a frost
Across 42 years with a frost, the median last spring frost at Rosthern falls on 23 May and the median first autumn frost on 11 September, which leaves a median of 115 days between them.
Fitted over all years, the growing season changes by +1.1 days per decade at this station.
Frost dates and growing season at Rosthern
Measure
Median, all years
Earliest period
Recent period (1923 to 1969)
Recent against earliest
Fitted trend
Last spring frost
23 May
n/a
22 May
n/a
+0.8 days per decade
First autumn frost
11 September
n/a
15 September
n/a
+1.9 days per decade
Growing days
115 days
n/a
116 days
n/a
+1.1 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
35 years, 1911 to 1964
A day with at least 32.8 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 106.0 mm (4.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Rosthern: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
32.8 mm (1.3 in)
5 years
45.3 mm (1.8 in)
10 years
55.9 mm (2.2 in)
25 years
72.5 mm (2.9 in)
50 years
87.8 mm (3.5 in)
Longer than the 35 years of record
100 years
106.0 mm (4.2 in)
Longer than the 35 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, 35 years of values from 1911 to 1964.
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: 92.2 mm (3.6 in) in 1937; 81.0 mm (3.2 in) in 1928; 66.3 mm (2.6 in) in 1958.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Rosthern standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Rosthern 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.