Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Isit. The lines show the 2026 daily maximum and minimum. 4 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Isit, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
2.0 C (35.6 F)
-54.4 C (-65.9 F)
-5.2 C (22.6 F)
-49.7 C (-57.5 F)
Feb
-0.1 C (31.8 F)
-53.3 C (-63.9 F)
-4.3 C (24.3 F)
-41.2 C (-42.2 F)
Mar
10.8 C (51.4 F)
-47.6 C (-53.7 F)
-0.4 C (31.3 F)
-39.1 C (-38.4 F)
Apr
18.5 C (65.3 F)
-35.9 C (-32.6 F)
14.9 C (58.8 F)
-20.4 C (-4.7 F)
May
29.5 C (85.1 F)
-17.0 C (1.4 F)
29.3 C (84.7 F)
-3.5 C (25.7 F)
Jun
35.2 C (95.4 F)
-4.1 C (24.6 F)
28.0 C (82.4 F)
-1.1 C (30.0 F)
Jul
37.5 C (99.5 F)
-1.7 C (28.9 F)
29.0 C (84.2 F)
5.2 C (41.4 F)
Aug
36.3 C (97.3 F)
-4.9 C (23.2 F)
28.1 C (82.6 F)
5.1 C (41.2 F)
Sep
31.7 C (89.1 F)
-14.0 C (6.8 F)
n/a
n/a
Oct
18.8 C (65.8 F)
-34.8 C (-30.6 F)
n/a
n/a
Nov
6.4 C (43.5 F)
-47.8 C (-54.0 F)
n/a
n/a
Dec
1.3 C (34.3 F)
-54.9 C (-66.8 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Isit still stand. 1979 holds the most, with 38.
Standing records at Isit by the year they were set
Year set
Standing records
1936
9
1937
19
1938
9
1939
24
1940
13
1941
15
1942
15
1943
2
1946
4
1947
20
1948
24
1949
9
1950
14
1951
21
1952
29
1953
10
1954
30
1955
34
1956
17
1957
16
1958
17
1959
10
1960
9
1961
15
1962
22
1963
14
1964
28
1965
15
1966
17
1967
27
1968
34
1969
24
1970
13
1971
17
1972
15
1973
15
1974
10
1975
12
1976
10
1977
21
1978
16
1979
38
1980
10
1981
18
1982
30
1983
19
1984
14
1985
10
1986
17
1987
28
1988
19
1989
17
1990
17
1991
9
1992
21
1993
34
1994
21
1995
13
1996
13
1997
14
1998
17
1999
29
2000
13
2001
11
2002
25
2003
19
2004
26
2005
8
2006
5
2007
18
2008
26
2009
9
2010
9
2011
17
2012
13
2013
13
2014
17
2015
13
2016
9
2017
25
2018
10
2019
10
2020
20
2021
14
2022
3
2023
13
2024
5
2025
10
All-Time Record Progression
9 new records
9 all-time records were set at Isit between 7 July 1970 and 1 July 2017. Each dot is a new record.
When Isit set new all-time records
Date
Kind
Detail
1970-07-07
Record high minimum temperature
Record high minimum temperature 22.3 C (72.1 F)
1987-01-06
Record low maximum temperature
Record low maximum temperature -51.3 C (-60.3 F)
1993-12-18
Record low maximum temperature
Record low maximum temperature -51.5 C (-60.7 F)
1993-12-18
Record low minimum temperature
Record low minimum temperature -54.9 C (-66.8 F)
1994-01-12
Record low maximum temperature
Record low maximum temperature -51.6 C (-60.9 F)
2002-07-02
Record high minimum temperature
Record high minimum temperature 23.4 C (74.1 F)
2011-07-17
Record high maximum temperature
Record high maximum temperature 36.6 C (97.9 F)
2013-08-03
Record daily precipitation
Record daily precipitation 86.1 mm (3.4 in)
2017-07-01
Record high maximum temperature
Record high maximum temperature 37.5 C (99.5 F)
Wettest Day of Each Month
Aug: 86.1 mm (3.4 in)
The wettest day on record for each calendar month at Isit. The most was 86.1 mm (3.4 in) on 3 August 2013.
Record daily precipitation for each month at Isit
Month
Record daily precipitation (mm)
Date
Jan
6.5 mm (0.26 in)
11 January 1980
Feb
6.0 mm (0.24 in)
15 February 2019
Mar
16.0 mm (0.6 in)
31 March 1977
Apr
11.7 mm (0.5 in)
7 April 1953
May
26.5 mm (1.0 in)
28 May 2015
Jun
33.6 mm (1.3 in)
28 June 2015
Jul
49.4 mm (1.9 in)
22 July 2012
Aug
86.1 mm (3.4 in)
3 August 2013
Sep
43.3 mm (1.7 in)
8 September 1990
Oct
15.0 mm (0.6 in)
12 October 1999
Nov
11.9 mm (0.5 in)
9 November 2006
Dec
6.1 mm (0.24 in)
5 December 2022
Period of Record Coverage
1936 to 2025
Complete yearUnder 90 percent of days
87 years of record at Isit, 1936 to 2025. 9 years have data for under 90 percent of days and are left out of rankings: 1943, 1947, 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 Isit, 1937 to 2018. Blue stripes are years cooler than the station's own mean of -7.5 C (18.5 F); red stripes are warmer. The coolest year was 1987, at -9.9 C (14.1 F), and the warmest was 2011, at -5.0 C (23.0 F). The strongest colour marks a difference of 2.5 C (4.5 F).
Annual mean temperature at Isit as warming stripes, 1937 to 2018
Year
Annual mean temperature
Difference from the station mean
1937
-7.6 C
-0.12 C
1938
-6.6 C
+0.86 C
1939
-6.3 C
+1.15 C
1940
-8.3 C
-0.85 C
1941
-8.9 C
-1.41 C
1942
-7.7 C
-0.25 C
1948
-5.6 C
+1.84 C
1949
-6.8 C
+0.71 C
1950
-8.6 C
-1.16 C
1951
-6.7 C
+0.80 C
1953
-6.9 C
+0.54 C
1954
-7.8 C
-0.32 C
1955
-9.1 C
-1.62 C
1956
-8.9 C
-1.43 C
1957
-8.7 C
-1.24 C
1958
-9.5 C
-1.99 C
1959
-6.7 C
+0.72 C
1960
-9.5 C
-2.08 C
1961
-8.3 C
-0.80 C
1962
-7.1 C
+0.37 C
1963
-6.7 C
+0.73 C
1964
-8.4 C
-0.93 C
1965
-9.8 C
-2.36 C
1966
-9.4 C
-1.98 C
1967
-6.7 C
+0.75 C
1968
-7.3 C
+0.19 C
1969
-9.6 C
-2.14 C
1970
-8.4 C
-0.96 C
1971
-7.5 C
-0.01 C
1972
-9.8 C
-2.29 C
1973
-7.2 C
+0.29 C
1974
-9.0 C
-1.54 C
1975
-6.4 C
+1.05 C
1976
-8.8 C
-1.31 C
1977
-9.4 C
-1.95 C
1978
-7.6 C
-0.15 C
1979
-9.6 C
-2.16 C
1980
-8.5 C
-1.01 C
1981
-7.2 C
+0.28 C
1983
-7.0 C
+0.50 C
1984
-8.4 C
-0.89 C
1985
-7.9 C
-0.46 C
1986
-7.5 C
-0.02 C
1987
-9.9 C
-2.46 C
1988
-6.0 C
+1.46 C
1989
-6.6 C
+0.85 C
1990
-6.6 C
+0.90 C
1991
-6.9 C
+0.58 C
1992
-6.5 C
+1.00 C
1993
-6.7 C
+0.74 C
1994
-8.7 C
-1.22 C
1995
-6.5 C
+0.92 C
1996
-7.4 C
+0.04 C
1997
-6.6 C
+0.89 C
1998
-7.7 C
-0.19 C
1999
-8.2 C
-0.72 C
2000
-7.7 C
-0.21 C
2001
-7.1 C
+0.35 C
2002
-5.9 C
+1.55 C
2003
-6.1 C
+1.39 C
2004
-8.4 C
-0.90 C
2005
-6.3 C
+1.20 C
2006
-7.7 C
-0.25 C
2007
-5.4 C
+2.05 C
2008
-5.0 C
+2.48 C
2009
-7.1 C
+0.34 C
2010
-6.9 C
+0.56 C
2011
-5.0 C
+2.49 C
2012
-7.2 C
+0.27 C
2013
-6.7 C
+0.75 C
2014
-6.7 C
+0.79 C
2015
-5.4 C
+2.07 C
2016
-6.5 C
+0.92 C
2017
-5.3 C
+2.12 C
2018
-5.8 C
+1.64 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1937 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 Isit
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.3) per decade
0.4 F (0.2 to 0.6) per decade
1937 to 2018
75
Rise
Mean daily maximum
0.13 C (0.01 to 0.26) per decade
0.24 F (0.02 to 0.46) per decade
1937 to 2018
75
Rise
Mean daily minimum
0.3 C (0.2 to 0.4) per decade
0.6 F (0.4 to 0.8) per decade
1937 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 Isit: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
37.5 C (99.5 F)
2017
32.7 C (90.9 F)
87
Coldest night (TNn)
-54.9 C (-66.8 F)
1993
-49.4 C (-57.0 F)
88
Wettest day (Rx1day)
86.1 mm (3.4 in)
2013
24.4 mm (1.0 in)
87
Wettest five days (Rx5day)
119.9 mm (4.7 in)
2013
42.3 mm (1.7 in)
87
Longest dry spell (CDD)
98 days
1948
33 days
87
Hottest day (TXx)
The hottest day of the year at Isit, 1936 to 2025. The record is 37.5 C (99.5 F) in 2017, marked on the chart; the median year is 32.7 C (90.9 F).
Hottest day (TXx) at Isit by year
Year
Hottest day (TXx)
1936
31.7 C (89.1 F)
1937
32.5 C (90.5 F)
1938
31.6 C (88.9 F)
1939
33.9 C (93.0 F)
1940
30.6 C (87.1 F)
1941
34.0 C (93.2 F)
1942
35.5 C (95.9 F)
1943
30.7 C (87.3 F)
1946
n/a
1947
34.2 C (93.6 F)
1948
36.4 C (97.5 F)
1949
34.0 C (93.2 F)
1950
31.7 C (89.1 F)
1951
32.7 C (90.9 F)
1952
36.3 C (97.3 F)
1953
33.5 C (92.3 F)
1954
35.4 C (95.7 F)
1955
32.4 C (90.3 F)
1956
33.5 C (92.3 F)
1957
32.5 C (90.5 F)
1958
33.5 C (92.3 F)
1959
30.0 C (86.0 F)
1960
34.1 C (93.4 F)
1961
34.2 C (93.6 F)
1962
32.4 C (90.3 F)
1963
32.0 C (89.6 F)
1964
31.4 C (88.5 F)
1965
30.4 C (86.7 F)
1966
34.6 C (94.3 F)
1967
31.1 C (88.0 F)
1968
32.7 C (90.9 F)
1969
34.3 C (93.7 F)
1970
34.7 C (94.5 F)
1971
32.3 C (90.1 F)
1972
28.6 C (83.5 F)
1973
33.8 C (92.8 F)
1974
30.6 C (87.1 F)
1975
32.5 C (90.5 F)
1976
30.5 C (86.9 F)
1977
31.8 C (89.2 F)
1978
30.9 C (87.6 F)
1979
31.2 C (88.2 F)
1980
33.4 C (92.1 F)
1981
30.6 C (87.1 F)
1982
30.0 C (86.0 F)
1983
31.5 C (88.7 F)
1984
29.7 C (85.5 F)
1985
32.7 C (90.9 F)
1986
35.8 C (96.4 F)
1987
30.7 C (87.3 F)
1988
34.6 C (94.3 F)
1989
31.5 C (88.7 F)
1990
32.0 C (89.6 F)
1991
33.4 C (92.1 F)
1992
32.3 C (90.1 F)
1993
33.7 C (92.7 F)
1994
30.6 C (87.1 F)
1995
33.9 C (93.0 F)
1996
34.9 C (94.8 F)
1997
33.4 C (92.1 F)
1998
33.4 C (92.1 F)
1999
34.6 C (94.3 F)
2000
32.6 C (90.7 F)
2001
34.9 C (94.8 F)
2002
34.3 C (93.7 F)
2003
33.4 C (92.1 F)
2004
30.6 C (87.1 F)
2005
31.1 C (88.0 F)
2006
30.7 C (87.3 F)
2007
32.1 C (89.8 F)
2008
34.0 C (93.2 F)
2009
32.5 C (90.5 F)
2010
34.6 C (94.3 F)
2011
36.6 C (97.9 F)
2012
34.9 C (94.8 F)
2013
31.0 C (87.8 F)
2014
32.6 C (90.7 F)
2015
32.7 C (90.9 F)
2016
30.4 C (86.7 F)
2017
37.5 C (99.5 F)
2018
34.8 C (94.6 F)
2019
32.6 C (90.7 F)
2020
34.0 C (93.2 F)
2021
36.0 C (96.8 F)
2022
33.3 C (91.9 F)
2023
33.0 C (91.4 F)
2024
33.1 C (91.6 F)
2025
29.3 C (84.7 F)
Coldest night (TNn)
The coldest night of the year at Isit, 1936 to 2025. The record is -54.9 C (-66.8 F) in 1993, marked on the chart; the median year is -49.4 C (-57.0 F).
Coldest night (TNn) at Isit by year
Year
Coldest night (TNn)
1936
-52.1 C (-61.8 F)
1937
-47.5 C (-53.5 F)
1938
-49.0 C (-56.2 F)
1939
-51.8 C (-61.2 F)
1940
-46.9 C (-52.4 F)
1941
-52.9 C (-63.2 F)
1942
-51.6 C (-60.9 F)
1943
-52.4 C (-62.3 F)
1946
-49.0 C (-56.2 F)
1947
-49.1 C (-56.4 F)
1948
-50.4 C (-58.7 F)
1949
-47.4 C (-53.3 F)
1950
-54.1 C (-65.4 F)
1951
-53.9 C (-65.0 F)
1952
-52.1 C (-61.8 F)
1953
-49.7 C (-57.5 F)
1954
-48.4 C (-55.1 F)
1955
-53.3 C (-63.9 F)
1956
-50.8 C (-59.4 F)
1957
-49.3 C (-56.7 F)
1958
-49.4 C (-56.9 F)
1959
-51.4 C (-60.5 F)
1960
-50.9 C (-59.6 F)
1961
-50.6 C (-59.1 F)
1962
-48.0 C (-54.4 F)
1963
-44.7 C (-48.5 F)
1964
-52.3 C (-62.1 F)
1965
-52.8 C (-63.0 F)
1966
-51.4 C (-60.5 F)
1967
-50.9 C (-59.6 F)
1968
-48.5 C (-55.3 F)
1969
-53.3 C (-63.9 F)
1970
-48.4 C (-55.1 F)
1971
-48.6 C (-55.5 F)
1972
-53.5 C (-64.3 F)
1973
-48.7 C (-55.7 F)
1974
-52.0 C (-61.6 F)
1975
-48.1 C (-54.6 F)
1976
-51.8 C (-61.2 F)
1977
-49.6 C (-57.3 F)
1978
-49.8 C (-57.6 F)
1979
-53.5 C (-64.3 F)
1980
-48.3 C (-54.9 F)
1981
-50.3 C (-58.5 F)
1982
-51.9 C (-61.4 F)
1983
-51.1 C (-60.0 F)
1984
-50.1 C (-58.2 F)
1985
-49.6 C (-57.3 F)
1986
-52.2 C (-62.0 F)
1987
-53.6 C (-64.5 F)
1988
-51.3 C (-60.3 F)
1989
-46.6 C (-51.9 F)
1990
-50.9 C (-59.6 F)
1991
-48.1 C (-54.6 F)
1992
-45.0 C (-49.0 F)
1993
-54.9 C (-66.8 F)
1994
-54.4 C (-65.9 F)
1995
-47.0 C (-52.6 F)
1996
-50.5 C (-58.9 F)
1997
-49.2 C (-56.6 F)
1998
-47.5 C (-53.5 F)
1999
-51.5 C (-60.7 F)
2000
-47.3 C (-53.1 F)
2001
-46.5 C (-51.7 F)
2002
-48.5 C (-55.3 F)
2003
-45.9 C (-50.6 F)
2004
-48.4 C (-55.1 F)
2005
-48.0 C (-54.4 F)
2006
-50.3 C (-58.5 F)
2007
-47.0 C (-52.6 F)
2008
-49.5 C (-57.1 F)
2009
-44.5 C (-48.1 F)
2010
-48.4 C (-55.1 F)
2011
-47.2 C (-53.0 F)
2012
-49.0 C (-56.2 F)
2013
-45.1 C (-49.2 F)
2014
-47.7 C (-53.9 F)
2015
-47.5 C (-53.5 F)
2016
-46.7 C (-52.1 F)
2017
-44.4 C (-47.9 F)
2018
-46.6 C (-51.9 F)
2019
-47.3 C (-53.1 F)
2020
-47.8 C (-54.0 F)
2021
-51.1 C (-60.0 F)
2022
-44.5 C (-48.1 F)
2023
-53.2 C (-63.8 F)
2024
-46.2 C (-51.2 F)
2025
-49.7 C (-57.5 F)
Wettest day (Rx1day)
The wettest day of the year at Isit, 1936 to 2025. The record is 86.1 mm (3.4 in) in 2013, marked on the chart; the median year is 24.4 mm (1.0 in).
Wettest day (Rx1day) at Isit by year
Year
Wettest day (Rx1day)
1936
23.7 mm (0.9 in)
1937
36.2 mm (1.4 in)
1938
52.6 mm (2.1 in)
1939
20.7 mm (0.8 in)
1940
19.4 mm (0.8 in)
1941
10.9 mm (0.4 in)
1942
14.9 mm (0.6 in)
1943
n/a
1946
15.4 mm (0.6 in)
1947
17.3 mm (0.7 in)
1948
62.7 mm (2.5 in)
1949
22.0 mm (0.9 in)
1950
16.5 mm (0.6 in)
1951
62.0 mm (2.4 in)
1952
23.8 mm (0.9 in)
1953
27.0 mm (1.1 in)
1954
17.0 mm (0.7 in)
1955
13.7 mm (0.5 in)
1956
21.8 mm (0.9 in)
1957
29.3 mm (1.2 in)
1958
20.3 mm (0.8 in)
1959
19.1 mm (0.8 in)
1960
34.3 mm (1.4 in)
1961
20.8 mm (0.8 in)
1962
14.9 mm (0.6 in)
1963
20.7 mm (0.8 in)
1964
32.9 mm (1.3 in)
1965
21.5 mm (0.8 in)
1966
24.4 mm (1.0 in)
1967
23.0 mm (0.9 in)
1968
25.1 mm (1.0 in)
1969
27.6 mm (1.1 in)
1970
27.1 mm (1.1 in)
1971
16.4 mm (0.6 in)
1972
32.5 mm (1.3 in)
1973
16.9 mm (0.7 in)
1974
26.5 mm (1.0 in)
1975
31.2 mm (1.2 in)
1976
22.9 mm (0.9 in)
1977
33.9 mm (1.3 in)
1978
53.0 mm (2.1 in)
1979
26.5 mm (1.0 in)
1980
16.7 mm (0.7 in)
1981
21.7 mm (0.9 in)
1982
31.2 mm (1.2 in)
1983
31.4 mm (1.2 in)
1984
15.5 mm (0.6 in)
1985
13.3 mm (0.5 in)
1986
11.2 mm (0.4 in)
1987
32.6 mm (1.3 in)
1988
41.4 mm (1.6 in)
1989
29.5 mm (1.2 in)
1990
43.3 mm (1.7 in)
1991
23.7 mm (0.9 in)
1992
10.7 mm (0.4 in)
1993
16.0 mm (0.6 in)
1994
29.4 mm (1.2 in)
1995
32.5 mm (1.3 in)
1996
17.9 mm (0.7 in)
1997
24.6 mm (1.0 in)
1998
22.7 mm (0.9 in)
1999
22.8 mm (0.9 in)
2000
12.9 mm (0.5 in)
2001
29.8 mm (1.2 in)
2002
24.1 mm (0.9 in)
2003
32.1 mm (1.3 in)
2004
24.4 mm (1.0 in)
2005
24.4 mm (1.0 in)
2006
43.5 mm (1.7 in)
2007
33.8 mm (1.3 in)
2008
30.5 mm (1.2 in)
2009
13.0 mm (0.5 in)
2010
21.7 mm (0.9 in)
2011
41.2 mm (1.6 in)
2012
49.4 mm (1.9 in)
2013
86.1 mm (3.4 in)
2014
25.5 mm (1.0 in)
2015
33.6 mm (1.3 in)
2016
26.6 mm (1.0 in)
2017
24.0 mm (0.9 in)
2018
32.9 mm (1.3 in)
2019
30.0 mm (1.2 in)
2020
15.0 mm (0.6 in)
2021
34.0 mm (1.3 in)
2022
23.9 mm (0.9 in)
2023
55.9 mm (2.2 in)
2024
20.1 mm (0.8 in)
2025
29.0 mm (1.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Isit, 1936 to 2025. The record is 119.9 mm (4.7 in) in 2013, marked on the chart; the median year is 42.3 mm (1.7 in).
Wettest five days (Rx5day) at Isit by year
Year
Wettest five days (Rx5day)
1936
28.1 mm (1.1 in)
1937
64.0 mm (2.5 in)
1938
62.6 mm (2.5 in)
1939
27.5 mm (1.1 in)
1940
39.7 mm (1.6 in)
1941
16.4 mm (0.6 in)
1942
19.5 mm (0.8 in)
1943
n/a
1946
22.3 mm (0.9 in)
1947
38.8 mm (1.5 in)
1948
97.2 mm (3.8 in)
1949
64.7 mm (2.5 in)
1950
19.6 mm (0.8 in)
1951
87.0 mm (3.4 in)
1952
58.7 mm (2.3 in)
1953
52.0 mm (2.0 in)
1954
22.9 mm (0.9 in)
1955
23.1 mm (0.9 in)
1956
21.8 mm (0.9 in)
1957
52.6 mm (2.1 in)
1958
33.3 mm (1.3 in)
1959
32.8 mm (1.3 in)
1960
44.4 mm (1.7 in)
1961
41.5 mm (1.6 in)
1962
31.0 mm (1.2 in)
1963
34.2 mm (1.3 in)
1964
46.2 mm (1.8 in)
1965
33.3 mm (1.3 in)
1966
53.0 mm (2.1 in)
1967
58.6 mm (2.3 in)
1968
40.3 mm (1.6 in)
1969
35.3 mm (1.4 in)
1970
43.0 mm (1.7 in)
1971
30.5 mm (1.2 in)
1972
60.0 mm (2.4 in)
1973
28.0 mm (1.1 in)
1974
31.7 mm (1.2 in)
1975
50.4 mm (2.0 in)
1976
36.7 mm (1.4 in)
1977
46.4 mm (1.8 in)
1978
58.1 mm (2.3 in)
1979
49.8 mm (2.0 in)
1980
25.2 mm (1.0 in)
1981
44.2 mm (1.7 in)
1982
54.7 mm (2.2 in)
1983
58.6 mm (2.3 in)
1984
29.9 mm (1.2 in)
1985
16.9 mm (0.7 in)
1986
21.7 mm (0.9 in)
1987
48.4 mm (1.9 in)
1988
44.4 mm (1.7 in)
1989
30.9 mm (1.2 in)
1990
55.2 mm (2.2 in)
1991
46.8 mm (1.8 in)
1992
16.9 mm (0.7 in)
1993
26.0 mm (1.0 in)
1994
51.4 mm (2.0 in)
1995
43.2 mm (1.7 in)
1996
59.8 mm (2.4 in)
1997
28.0 mm (1.1 in)
1998
26.6 mm (1.0 in)
1999
42.9 mm (1.7 in)
2000
19.3 mm (0.8 in)
2001
31.8 mm (1.3 in)
2002
25.8 mm (1.0 in)
2003
55.7 mm (2.2 in)
2004
43.1 mm (1.7 in)
2005
39.2 mm (1.5 in)
2006
84.8 mm (3.3 in)
2007
62.1 mm (2.4 in)
2008
48.4 mm (1.9 in)
2009
25.4 mm (1.0 in)
2010
26.8 mm (1.1 in)
2011
55.5 mm (2.2 in)
2012
60.5 mm (2.4 in)
2013
119.9 mm (4.7 in)
2014
37.8 mm (1.5 in)
2015
53.1 mm (2.1 in)
2016
35.9 mm (1.4 in)
2017
68.4 mm (2.7 in)
2018
42.3 mm (1.7 in)
2019
56.9 mm (2.2 in)
2020
22.1 mm (0.9 in)
2021
73.4 mm (2.9 in)
2022
36.3 mm (1.4 in)
2023
88.4 mm (3.5 in)
2024
29.2 mm (1.1 in)
2025
50.0 mm (2.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Isit, 1936 to 2025. The record is 98 days in 1948, marked on the chart; the median year is 33 days.
Longest dry spell (CDD) at Isit by year
Year
Longest dry spell (CDD)
1936
77 days
1937
53 days
1938
41 days
1939
54 days
1940
75 days
1941
63 days
1942
58 days
1943
n/a
1946
31 days
1947
53 days
1948
98 days
1949
37 days
1950
47 days
1951
91 days
1952
60 days
1953
33 days
1954
35 days
1955
27 days
1956
42 days
1957
31 days
1958
31 days
1959
24 days
1960
45 days
1961
28 days
1962
23 days
1963
48 days
1964
49 days
1965
78 days
1966
52 days
1967
29 days
1968
41 days
1969
57 days
1970
31 days
1971
38 days
1972
53 days
1973
55 days
1974
35 days
1975
28 days
1976
19 days
1977
40 days
1978
18 days
1979
84 days
1980
68 days
1981
77 days
1982
31 days
1983
26 days
1984
32 days
1985
38 days
1986
28 days
1987
34 days
1988
31 days
1989
23 days
1990
23 days
1991
31 days
1992
29 days
1993
21 days
1994
27 days
1995
46 days
1996
20 days
1997
29 days
1998
28 days
1999
46 days
2000
46 days
2001
40 days
2002
22 days
2003
24 days
2004
25 days
2005
37 days
2006
53 days
2007
34 days
2008
28 days
2009
37 days
2010
48 days
2011
30 days
2012
24 days
2013
40 days
2014
22 days
2015
34 days
2016
24 days
2017
26 days
2018
27 days
2019
15 days
2020
27 days
2021
18 days
2022
21 days
2023
16 days
2024
23 days
2025
17 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
75 years with a frost
Across 75 years with a frost, the median last spring frost at Isit falls on 28 May and the median first autumn frost on 5 September, which leaves a median of 98 days between them.
In 1989 to 2018 the median growing season was 100 days. That is 3 days more than in 1937 to 1972.
Fitted over all years, the growing season changes by +0.3 days per decade at this station.
Frost dates and growing season at Isit
Measure
Median, all years
Earliest period (1937 to 1972)
Recent period (1989 to 2018)
Recent against earliest
Fitted trend
Last spring frost
28 May
29 May
28 May
1 day earlier
0.0 days per decade
First autumn frost
5 September
4 September
7 September
3 days later
+0.3 days per decade
Growing days
98 days
97 days
100 days
3 days more
+0.3 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
83 years, 1936 to 2023
A day with at least 24.6 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 74.3 mm (2.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Isit: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
24.6 mm (1.0 in)
5 years
35.1 mm (1.4 in)
10 years
43.1 mm (1.7 in)
25 years
54.5 mm (2.1 in)
50 years
63.9 mm (2.5 in)
100 years
74.3 mm (2.9 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 2023.
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: 86.1 mm (3.4 in) in 2013; 62.7 mm (2.5 in) in 1948; 62.0 mm (2.4 in) in 1951.
Climate Twins
2004 to 2018 against 1961 to 1990
Over 2004 to 2018, Isit had a mean temperature of -6.4 C (20.5 F) and 366.2 mm (14.4 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Uchur (Russia, 377 km away), Dzhikimda (Russia, 281 km away) and Srednjaja Olekma (Russia, 661 km away).
Climate twins of Isit: stations whose 1961 to 1990 climate is closest to its 2004 to 2018 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 Isit standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Isit 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.