Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Onega. 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 Onega, 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)
-42.1 C (-43.8 F)
-6.7 C (19.9 F)
n/a
Feb
5.3 C (41.5 F)
-42.5 C (-44.5 F)
n/a
n/a
Mar
13.4 C (56.1 F)
-38.5 C (-37.3 F)
-2.3 C (27.9 F)
-6.8 C (19.8 F)
Apr
25.9 C (78.6 F)
-26.0 C (-14.8 F)
n/a
n/a
May
32.5 C (90.5 F)
-14.6 C (5.7 F)
n/a
n/a
Jun
33.2 C (91.8 F)
-3.4 C (25.9 F)
n/a
n/a
Jul
35.8 C (96.4 F)
-0.4 C (31.3 F)
n/a
n/a
Aug
34.4 C (93.9 F)
-3.0 C (26.6 F)
n/a
n/a
Sep
27.4 C (81.3 F)
-4.9 C (23.2 F)
n/a
n/a
Oct
19.8 C (67.6 F)
-19.3 C (-2.7 F)
n/a
n/a
Nov
11.1 C (52.0 F)
-31.5 C (-24.7 F)
n/a
n/a
Dec
7.7 C (45.9 F)
-41.2 C (-42.2 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Onega still stand. 1999 holds the most, with 47.
Standing records at Onega by the year they were set
Year set
Standing records
1936
24
1937
16
1938
22
1939
13
1940
25
1941
41
1942
16
1943
8
1944
16
1945
16
1946
9
1947
11
1948
19
1949
13
1950
7
1951
11
1952
14
1953
17
1954
4
1955
23
1956
26
1957
21
1958
14
1959
10
1960
13
1961
6
1962
4
1963
16
1964
12
1965
9
1966
26
1967
20
1968
17
1969
17
1970
9
1971
19
1972
30
1973
17
1974
10
1975
16
1976
18
1977
16
1978
31
1979
22
1980
14
1981
8
1982
21
1983
15
1984
6
1985
17
1986
16
1987
29
1988
12
1989
24
1990
19
1991
12
1992
31
1993
13
1994
5
1995
17
1996
24
1997
16
1998
26
1999
47
2000
18
2001
25
2002
15
2003
13
2004
10
2005
23
2006
30
2007
17
2008
16
2009
6
2010
36
2011
15
2012
6
2013
15
2014
25
2015
19
2016
14
2017
10
2018
18
2019
8
2020
9
2021
13
2022
5
2023
2
All-Time Record Progression
9 new records
9 all-time records were set at Onega between 8 July 1972 and 13 August 2018. Each dot is a new record.
When Onega set new all-time records
Date
Kind
Detail
1972-07-08
Record high maximum temperature
Record high maximum temperature 34.1 C (93.4 F)
1972-07-09
Record high maximum temperature
Record high maximum temperature 35.8 C (96.4 F)
1972-07-09
Record high minimum temperature
Record high minimum temperature 23.2 C (73.8 F)
1972-07-13
Record high minimum temperature
Record high minimum temperature 24.4 C (75.9 F)
1985-01-04
Record low maximum temperature
Record low maximum temperature -35.7 C (-32.3 F)
1985-08-02
Record daily precipitation
Record daily precipitation 57.6 mm (2.3 in)
1987-01-11
Record low maximum temperature
Record low maximum temperature -35.8 C (-32.4 F)
1987-01-12
Record low maximum temperature
Record low maximum temperature -36.4 C (-33.5 F)
2018-08-13
Record daily precipitation
Record daily precipitation 63.0 mm (2.5 in)
Wettest Day of Each Month
Aug: 63.0 mm (2.5 in)
The wettest day on record for each calendar month at Onega. The most was 63.0 mm (2.5 in) on 13 August 2018.
Record daily precipitation for each month at Onega
Month
Record daily precipitation (mm)
Date
Jan
20.5 mm (0.8 in)
9 January 1957
Feb
16.3 mm (0.6 in)
21 February 1990
Mar
21.2 mm (0.8 in)
3 March 1997
Apr
20.1 mm (0.8 in)
29 April 1981
May
24.1 mm (0.9 in)
16 May 1957
Jun
51.5 mm (2.0 in)
20 June 2007
Jul
55.1 mm (2.2 in)
19 July 2012
Aug
63.0 mm (2.5 in)
13 August 2018
Sep
44.5 mm (1.8 in)
5 September 1996
Oct
27.6 mm (1.1 in)
5 October 1948
Nov
24.2 mm (1.0 in)
22 November 1980
Dec
19.7 mm (0.8 in)
19 December 2003
Period of Record Coverage
1936 to 2025
Complete yearUnder 90 percent of days
90 years of record at Onega, 1936 to 2025. 9 years have data for under 90 percent of days and are left out of rankings: 1943, 1944, 2019, 2020, 2021, 2022, 2023, 2024 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 75 complete years at Onega, 1936 to 2018. Blue stripes are years cooler than the station's own mean of 1.9 C (35.5 F); red stripes are warmer. The coolest year was 1941, at -1.7 C (28.9 F), and the warmest was 2015, at 4.2 C (39.6 F). The strongest colour marks a difference of 3.7 C (6.7 F).
Annual mean temperature at Onega as warming stripes, 1936 to 2018
Year
Annual mean temperature
Difference from the station mean
1936
3.0 C
+1.03 C
1937
3.1 C
+1.18 C
1939
1.3 C
-0.61 C
1940
0.2 C
-1.72 C
1941
-1.7 C
-3.67 C
1942
0.3 C
-1.66 C
1945
0.6 C
-1.32 C
1946
1.8 C
-0.15 C
1947
0.6 C
-1.31 C
1948
2.5 C
+0.51 C
1949
3.0 C
+1.09 C
1950
2.1 C
+0.18 C
1951
2.2 C
+0.22 C
1952
1.4 C
-0.53 C
1953
2.2 C
+0.21 C
1954
2.7 C
+0.72 C
1955
-0.2 C
-2.17 C
1956
0.3 C
-1.69 C
1957
2.8 C
+0.81 C
1958
0.4 C
-1.51 C
1959
2.0 C
+0.09 C
1960
1.7 C
-0.29 C
1961
3.2 C
+1.21 C
1962
2.2 C
+0.26 C
1963
0.8 C
-1.13 C
1964
2.1 C
+0.11 C
1965
1.1 C
-0.89 C
1966
-0.8 C
-2.74 C
1967
3.0 C
+1.09 C
1968
0.2 C
-1.74 C
1969
-0.1 C
-2.04 C
1970
2.1 C
+0.15 C
1971
0.7 C
-1.20 C
1972
2.9 C
+0.99 C
1973
1.5 C
-0.43 C
1974
3.5 C
+1.57 C
1975
3.3 C
+1.36 C
1976
0.8 C
-1.16 C
1977
2.0 C
+0.03 C
1978
-0.3 C
-2.28 C
1979
1.6 C
-0.35 C
1980
1.2 C
-0.74 C
1981
2.6 C
+0.66 C
1982
2.0 C
+0.02 C
1983
2.6 C
+0.69 C
1984
2.4 C
+0.49 C
1985
-0.2 C
-2.13 C
1986
1.5 C
-0.49 C
1987
0.0 C
-1.99 C
1988
2.2 C
+0.30 C
1989
4.2 C
+2.22 C
1990
2.6 C
+0.65 C
1991
2.5 C
+0.52 C
1992
2.5 C
+0.55 C
1993
1.6 C
-0.39 C
1994
1.9 C
-0.06 C
1995
3.3 C
+1.37 C
1996
2.2 C
+0.26 C
1997
1.3 C
-0.62 C
1998
1.0 C
-0.92 C
1999
2.1 C
+0.11 C
2000
3.8 C
+1.83 C
2001
2.1 C
+0.19 C
2002
1.7 C
-0.23 C
2003
3.0 C
+1.02 C
2004
3.1 C
+1.16 C
2010
2.0 C
+0.03 C
2011
3.8 C
+1.82 C
2012
2.3 C
+0.33 C
2013
3.9 C
+1.94 C
2014
3.7 C
+1.75 C
2015
4.2 C
+2.30 C
2016
4.0 C
+2.03 C
2017
3.0 C
+1.10 C
2018
3.6 C
+1.64 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.4) per decade over 1936 to 2018. In Fahrenheit: 0.4 F (0.2 to 0.6) per decade. The slope is a straight line fitted to 75 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Onega
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.4) per decade
0.4 F (0.2 to 0.6) per decade
1936 to 2018
75
Rise
Mean daily maximum
0.2 C (0.1 to 0.3) per decade
0.4 F (0.2 to 0.6) per decade
1936 to 2018
75
Rise
Mean daily minimum
0.3 C (0.2 to 0.4) per decade
0.5 F (0.3 to 0.7) per decade
1936 to 2018
75
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
1936 to 2025
Yearly extremes at Onega: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
35.8 C (96.4 F)
1972
30.2 C (86.4 F)
90
Coldest night (TNn)
-42.5 C (-44.5 F)
1946
-33.4 C (-28.1 F)
90
Wettest day (Rx1day)
63.0 mm (2.5 in)
2018
25.5 mm (1.0 in)
90
Wettest five days (Rx5day)
101.9 mm (4.0 in)
2015
45.4 mm (1.8 in)
88
Longest dry spell (CDD)
42 days
1978
18 days
90
Hottest day (TXx)
The hottest day of the year at Onega, 1936 to 2025. The record is 35.8 C (96.4 F) in 1972, marked on the chart; the median year is 30.2 C (86.4 F).
Hottest day (TXx) at Onega by year
Year
Hottest day (TXx)
1936
32.2 C (90.0 F)
1937
31.5 C (88.7 F)
1938
31.3 C (88.3 F)
1939
30.4 C (86.7 F)
1940
31.9 C (89.4 F)
1941
32.3 C (90.1 F)
1942
28.7 C (83.7 F)
1943
31.8 C (89.2 F)
1944
18.6 C (65.5 F)
1945
30.8 C (87.4 F)
1946
31.2 C (88.2 F)
1947
31.5 C (88.7 F)
1948
32.9 C (91.2 F)
1949
27.1 C (80.8 F)
1950
28.2 C (82.8 F)
1951
28.7 C (83.7 F)
1952
28.9 C (84.0 F)
1953
29.9 C (85.8 F)
1954
31.7 C (89.1 F)
1955
27.6 C (81.7 F)
1956
30.2 C (86.4 F)
1957
30.9 C (87.6 F)
1958
29.7 C (85.5 F)
1959
28.6 C (83.5 F)
1960
33.2 C (91.8 F)
1961
30.0 C (86.0 F)
1962
26.4 C (79.5 F)
1963
30.2 C (86.4 F)
1964
30.5 C (86.9 F)
1965
27.1 C (80.8 F)
1966
28.1 C (82.6 F)
1967
31.5 C (88.7 F)
1968
29.0 C (84.2 F)
1969
30.5 C (86.9 F)
1970
32.3 C (90.1 F)
1971
29.0 C (84.2 F)
1972
35.8 C (96.4 F)
1973
29.6 C (85.3 F)
1974
31.4 C (88.5 F)
1975
30.6 C (87.1 F)
1976
26.7 C (80.1 F)
1977
30.7 C (87.3 F)
1978
29.5 C (85.1 F)
1979
28.5 C (83.3 F)
1980
29.2 C (84.6 F)
1981
31.6 C (88.9 F)
1982
31.4 C (88.5 F)
1983
30.0 C (86.0 F)
1984
28.5 C (83.3 F)
1985
28.8 C (83.8 F)
1986
29.5 C (85.1 F)
1987
27.8 C (82.0 F)
1988
31.5 C (88.7 F)
1989
31.5 C (88.7 F)
1990
30.5 C (86.9 F)
1991
28.5 C (83.3 F)
1992
29.1 C (84.4 F)
1993
26.8 C (80.2 F)
1994
28.5 C (83.3 F)
1995
28.9 C (84.0 F)
1996
32.8 C (91.0 F)
1997
28.9 C (84.0 F)
1998
31.6 C (88.9 F)
1999
32.1 C (89.8 F)
2000
31.8 C (89.2 F)
2001
34.3 C (93.7 F)
2002
31.4 C (88.5 F)
2003
31.3 C (88.3 F)
2004
31.6 C (88.9 F)
2005
29.7 C (85.5 F)
2006
31.9 C (89.4 F)
2007
30.3 C (86.5 F)
2008
28.2 C (82.8 F)
2009
28.6 C (83.5 F)
2010
34.6 C (94.3 F)
2011
34.0 C (93.2 F)
2012
30.2 C (86.4 F)
2013
31.5 C (88.7 F)
2014
32.0 C (89.6 F)
2015
25.4 C (77.7 F)
2016
31.6 C (88.9 F)
2017
27.1 C (80.8 F)
2018
29.5 C (85.1 F)
2019
30.7 C (87.3 F)
2020
28.0 C (82.4 F)
2021
33.2 C (91.8 F)
2022
29.8 C (85.6 F)
2023
25.3 C (77.5 F)
2024
21.8 C (71.2 F)
2025
-2.3 C (27.9 F)
Coldest night (TNn)
The coldest night of the year at Onega, 1936 to 2025. The record is -42.5 C (-44.5 F) in 1946, marked on the chart; the median year is -33.4 C (-28.1 F).
Coldest night (TNn) at Onega by year
Year
Coldest night (TNn)
1936
-40.1 C (-40.2 F)
1937
-29.3 C (-20.7 F)
1938
-33.1 C (-27.6 F)
1939
-34.8 C (-30.6 F)
1940
-38.9 C (-38.0 F)
1941
-39.6 C (-39.3 F)
1942
-35.9 C (-32.6 F)
1943
-29.9 C (-21.8 F)
1944
-22.7 C (-8.9 F)
1945
-36.6 C (-33.9 F)
1946
-42.5 C (-44.5 F)
1947
-34.1 C (-29.4 F)
1948
-30.2 C (-22.4 F)
1949
-32.0 C (-25.6 F)
1950
-38.9 C (-38.0 F)
1951
-33.9 C (-29.0 F)
1952
-34.1 C (-29.4 F)
1953
-35.4 C (-31.7 F)
1954
-31.7 C (-25.1 F)
1955
-35.7 C (-32.3 F)
1956
-36.5 C (-33.7 F)
1957
-38.5 C (-37.3 F)
1958
-37.7 C (-35.9 F)
1959
-30.6 C (-23.1 F)
1960
-34.0 C (-29.2 F)
1961
-27.8 C (-18.0 F)
1962
-29.1 C (-20.4 F)
1963
-33.7 C (-28.7 F)
1964
-33.3 C (-27.9 F)
1965
-30.6 C (-23.1 F)
1966
-37.3 C (-35.1 F)
1967
-35.3 C (-31.5 F)
1968
-38.0 C (-36.4 F)
1969
-34.5 C (-30.1 F)
1970
-35.6 C (-32.1 F)
1971
-31.7 C (-25.1 F)
1972
-33.5 C (-28.3 F)
1973
-34.6 C (-30.3 F)
1974
-26.8 C (-16.2 F)
1975
-30.9 C (-23.6 F)
1976
-34.1 C (-29.4 F)
1977
-33.6 C (-28.5 F)
1978
-41.2 C (-42.2 F)
1979
-37.8 C (-36.0 F)
1980
-33.0 C (-27.4 F)
1981
-32.7 C (-26.9 F)
1982
-41.9 C (-43.4 F)
1983
-27.8 C (-18.0 F)
1984
-27.0 C (-16.6 F)
1985
-38.4 C (-37.1 F)
1986
-35.0 C (-31.0 F)
1987
-42.1 C (-43.8 F)
1988
-32.3 C (-26.1 F)
1989
-32.5 C (-26.5 F)
1990
-35.3 C (-31.5 F)
1991
-32.0 C (-25.6 F)
1992
-30.0 C (-22.0 F)
1993
-30.3 C (-22.5 F)
1994
-37.8 C (-36.0 F)
1995
-31.3 C (-24.3 F)
1996
-30.0 C (-22.0 F)
1997
-30.9 C (-23.6 F)
1998
-36.7 C (-34.1 F)
1999
-40.7 C (-41.3 F)
2000
-29.5 C (-21.1 F)
2001
-34.1 C (-29.4 F)
2002
-34.3 C (-29.7 F)
2003
-35.4 C (-31.7 F)
2004
-30.7 C (-23.3 F)
2005
-26.2 C (-15.2 F)
2006
-36.0 C (-32.8 F)
2007
-36.3 C (-33.3 F)
2008
-21.7 C (-7.1 F)
2009
-32.9 C (-27.2 F)
2010
-35.2 C (-31.4 F)
2011
-32.7 C (-26.9 F)
2012
-29.7 C (-21.5 F)
2013
-28.5 C (-19.3 F)
2014
-30.6 C (-23.1 F)
2015
-30.2 C (-22.4 F)
2016
-28.4 C (-19.1 F)
2017
-38.5 C (-37.3 F)
2018
-29.4 C (-20.9 F)
2019
-27.3 C (-17.1 F)
2020
-30.0 C (-22.0 F)
2021
-33.8 C (-28.8 F)
2022
-24.9 C (-12.8 F)
2023
-25.4 C (-13.7 F)
2024
-3.3 C (26.1 F)
2025
-6.8 C (19.8 F)
Wettest day (Rx1day)
The wettest day of the year at Onega, 1936 to 2025. The record is 63.0 mm (2.5 in) in 2018, marked on the chart; the median year is 25.5 mm (1.0 in).
Wettest day (Rx1day) at Onega by year
Year
Wettest day (Rx1day)
1936
46.8 mm (1.8 in)
1937
17.1 mm (0.7 in)
1938
18.4 mm (0.7 in)
1939
17.5 mm (0.7 in)
1940
28.2 mm (1.1 in)
1941
17.0 mm (0.7 in)
1942
30.4 mm (1.2 in)
1943
12.8 mm (0.5 in)
1944
18.8 mm (0.7 in)
1945
21.9 mm (0.9 in)
1946
25.0 mm (1.0 in)
1947
19.7 mm (0.8 in)
1948
52.4 mm (2.1 in)
1949
23.2 mm (0.9 in)
1950
38.4 mm (1.5 in)
1951
24.1 mm (0.9 in)
1952
17.6 mm (0.7 in)
1953
19.0 mm (0.7 in)
1954
24.8 mm (1.0 in)
1955
22.2 mm (0.9 in)
1956
18.6 mm (0.7 in)
1957
40.0 mm (1.6 in)
1958
13.6 mm (0.5 in)
1959
27.0 mm (1.1 in)
1960
43.6 mm (1.7 in)
1961
27.6 mm (1.1 in)
1962
20.8 mm (0.8 in)
1963
33.1 mm (1.3 in)
1964
42.8 mm (1.7 in)
1965
21.5 mm (0.8 in)
1966
29.6 mm (1.2 in)
1967
24.6 mm (1.0 in)
1968
28.0 mm (1.1 in)
1969
26.8 mm (1.1 in)
1970
34.1 mm (1.3 in)
1971
21.2 mm (0.8 in)
1972
27.1 mm (1.1 in)
1973
15.8 mm (0.6 in)
1974
25.2 mm (1.0 in)
1975
23.0 mm (0.9 in)
1976
23.2 mm (0.9 in)
1977
44.2 mm (1.7 in)
1978
21.3 mm (0.8 in)
1979
27.3 mm (1.1 in)
1980
24.2 mm (1.0 in)
1981
30.6 mm (1.2 in)
1982
23.6 mm (0.9 in)
1983
22.9 mm (0.9 in)
1984
26.6 mm (1.0 in)
1985
57.6 mm (2.3 in)
1986
25.8 mm (1.0 in)
1987
36.3 mm (1.4 in)
1988
25.0 mm (1.0 in)
1989
35.5 mm (1.4 in)
1990
26.0 mm (1.0 in)
1991
31.7 mm (1.2 in)
1992
17.7 mm (0.7 in)
1993
28.7 mm (1.1 in)
1994
19.5 mm (0.8 in)
1995
32.7 mm (1.3 in)
1996
44.5 mm (1.8 in)
1997
41.5 mm (1.6 in)
1998
44.8 mm (1.8 in)
1999
26.5 mm (1.0 in)
2000
32.2 mm (1.3 in)
2001
27.5 mm (1.1 in)
2002
19.2 mm (0.8 in)
2003
25.1 mm (1.0 in)
2004
40.3 mm (1.6 in)
2005
31.3 mm (1.2 in)
2006
19.2 mm (0.8 in)
2007
51.5 mm (2.0 in)
2008
30.2 mm (1.2 in)
2009
30.2 mm (1.2 in)
2010
22.9 mm (0.9 in)
2011
18.3 mm (0.7 in)
2012
55.1 mm (2.2 in)
2013
22.3 mm (0.9 in)
2014
19.6 mm (0.8 in)
2015
41.1 mm (1.6 in)
2016
27.7 mm (1.1 in)
2017
38.1 mm (1.5 in)
2018
63.0 mm (2.5 in)
2019
19.1 mm (0.8 in)
2020
23.9 mm (0.9 in)
2021
16.0 mm (0.6 in)
2022
25.9 mm (1.0 in)
2023
17.8 mm (0.7 in)
2024
1.0 mm (0.04 in)
2025
2.0 mm (0.08 in)
Wettest five days (Rx5day)
The wettest five days of the year at Onega, 1936 to 2025. The record is 101.9 mm (4.0 in) in 2015, marked on the chart; the median year is 45.4 mm (1.8 in).
Wettest five days (Rx5day) at Onega by year
Year
Wettest five days (Rx5day)
1936
55.5 mm (2.2 in)
1937
28.8 mm (1.1 in)
1938
36.9 mm (1.5 in)
1939
43.7 mm (1.7 in)
1940
58.0 mm (2.3 in)
1941
38.0 mm (1.5 in)
1942
51.0 mm (2.0 in)
1943
19.3 mm (0.8 in)
1944
48.1 mm (1.9 in)
1945
41.6 mm (1.6 in)
1946
49.7 mm (2.0 in)
1947
29.7 mm (1.2 in)
1948
69.3 mm (2.7 in)
1949
57.5 mm (2.3 in)
1950
67.5 mm (2.7 in)
1951
43.6 mm (1.7 in)
1952
38.5 mm (1.5 in)
1953
47.8 mm (1.9 in)
1954
48.7 mm (1.9 in)
1955
41.1 mm (1.6 in)
1956
30.6 mm (1.2 in)
1957
51.2 mm (2.0 in)
1958
26.6 mm (1.0 in)
1959
59.8 mm (2.4 in)
1960
74.0 mm (2.9 in)
1961
39.8 mm (1.6 in)
1962
44.4 mm (1.7 in)
1963
42.9 mm (1.7 in)
1964
45.8 mm (1.8 in)
1965
32.0 mm (1.3 in)
1966
62.5 mm (2.5 in)
1967
35.1 mm (1.4 in)
1968
38.1 mm (1.5 in)
1969
39.6 mm (1.6 in)
1970
49.1 mm (1.9 in)
1971
45.0 mm (1.8 in)
1972
58.0 mm (2.3 in)
1973
38.4 mm (1.5 in)
1974
41.3 mm (1.6 in)
1975
32.9 mm (1.3 in)
1976
52.5 mm (2.1 in)
1977
52.6 mm (2.1 in)
1978
50.1 mm (2.0 in)
1979
59.0 mm (2.3 in)
1980
38.7 mm (1.5 in)
1981
51.5 mm (2.0 in)
1982
36.4 mm (1.4 in)
1983
44.0 mm (1.7 in)
1984
63.9 mm (2.5 in)
1985
78.5 mm (3.1 in)
1986
33.7 mm (1.3 in)
1987
53.0 mm (2.1 in)
1988
36.1 mm (1.4 in)
1989
44.4 mm (1.7 in)
1990
44.1 mm (1.7 in)
1991
50.0 mm (2.0 in)
1992
36.6 mm (1.4 in)
1993
32.1 mm (1.3 in)
1994
44.7 mm (1.8 in)
1995
69.0 mm (2.7 in)
1996
54.7 mm (2.2 in)
1997
60.3 mm (2.4 in)
1998
77.9 mm (3.1 in)
1999
42.3 mm (1.7 in)
2000
39.0 mm (1.5 in)
2001
34.9 mm (1.4 in)
2002
33.1 mm (1.3 in)
2003
52.8 mm (2.1 in)
2004
62.9 mm (2.5 in)
2005
34.3 mm (1.4 in)
2006
57.6 mm (2.3 in)
2007
83.0 mm (3.3 in)
2008
55.3 mm (2.2 in)
2009
51.6 mm (2.0 in)
2010
48.7 mm (1.9 in)
2011
32.9 mm (1.3 in)
2012
88.4 mm (3.5 in)
2013
61.0 mm (2.4 in)
2014
37.8 mm (1.5 in)
2015
101.9 mm (4.0 in)
2016
58.9 mm (2.3 in)
2017
58.6 mm (2.3 in)
2018
67.8 mm (2.7 in)
2019
25.2 mm (1.0 in)
2020
23.7 mm (0.9 in)
2021
29.2 mm (1.1 in)
2022
47.0 mm (1.9 in)
2023
25.4 mm (1.0 in)
2024
n/a
2025
n/a
Longest dry spell (CDD)
The longest dry spell of the year at Onega, 1936 to 2025. The record is 42 days in 1978, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Onega by year
Year
Longest dry spell (CDD)
1936
18 days
1937
27 days
1938
14 days
1939
32 days
1940
32 days
1941
13 days
1942
23 days
1943
17 days
1944
22 days
1945
16 days
1946
14 days
1947
24 days
1948
21 days
1949
13 days
1950
22 days
1951
30 days
1952
24 days
1953
16 days
1954
19 days
1955
19 days
1956
31 days
1957
11 days
1958
25 days
1959
30 days
1960
23 days
1961
13 days
1962
17 days
1963
33 days
1964
20 days
1965
31 days
1966
16 days
1967
17 days
1968
11 days
1969
19 days
1970
24 days
1971
14 days
1972
25 days
1973
25 days
1974
24 days
1975
18 days
1976
23 days
1977
15 days
1978
42 days
1979
12 days
1980
35 days
1981
14 days
1982
25 days
1983
14 days
1984
17 days
1985
36 days
1986
25 days
1987
17 days
1988
13 days
1989
11 days
1990
32 days
1991
17 days
1992
16 days
1993
18 days
1994
21 days
1995
16 days
1996
26 days
1997
18 days
1998
27 days
1999
25 days
2000
18 days
2001
23 days
2002
25 days
2003
16 days
2004
25 days
2005
23 days
2006
23 days
2007
18 days
2008
11 days
2009
15 days
2010
13 days
2011
16 days
2012
16 days
2013
26 days
2014
15 days
2015
14 days
2016
22 days
2017
14 days
2018
18 days
2019
14 days
2020
6 days
2021
12 days
2022
18 days
2023
18 days
2024
2 days
2025
1 day
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
75 years with a frost
Across 75 years with a frost, the median last spring frost at Onega falls on 30 May and the median first autumn frost on 15 September, which leaves a median of 112 days between them.
In 1984 to 2018 the median growing season was 121 days. That is 16 days more than in 1936 to 1968.
Fitted over all years, the growing season changes by +3.1 days per decade at this station.
Frost dates and growing season at Onega
Measure
Median, all years
Earliest period (1936 to 1968)
Recent period (1984 to 2018)
Recent against earliest
Fitted trend
Last spring frost
30 May
1 June
28 May
4 days earlier
-1.2 days per decade
First autumn frost
15 September
14 September
18 September
4 days later
+1.9 days per decade
Growing days
112 days
105 days
121 days
16 days more
+3.1 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
83 years, 1936 to 2018
A day with at least 26.4 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 68.0 mm (2.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Onega: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
26.4 mm (1.0 in)
5 years
35.7 mm (1.4 in)
10 years
42.5 mm (1.7 in)
25 years
52.0 mm (2.0 in)
50 years
59.7 mm (2.4 in)
100 years
68.0 mm (2.7 in)
Longer than the 83 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, 83 years of values from 1936 to 2018.
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: 63.0 mm (2.5 in) in 2018; 57.6 mm (2.3 in) in 1985; 55.1 mm (2.2 in) in 2012.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Onega, at 1957. Each is measured against neighbouring stations.
Relative to 4 neighbouring stations, the station's annual mean temperature from 1957 ran 0.4 C (0.7 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Onega, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1957
+0.4
+0.7
likely
4
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Onega standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Onega 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.