Ust-Isim Weather Records (RSM00028382)

Record envelope, standing records and threshold days for Ust-Isim (RSM00028382), Russia, with 90 years of record.

Key Facts for Ust-Isim

Ust-Isim (RSM00028382) is a weather station in Russia at 57.72 latitude and 57.68 longitude, 56 m (184 ft) above sea level.
The station reports from 1936 to 2025, 90 years of record.
1,464 records set at Ust-Isim still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Ust-Isim set a daily record precipitation of 7.9 mm (0.31 in) on 26 April 2025.

About the Station

Location: Russia, 57.72 latitude, 57.68 longitude.
Elevation: 56 m (184 ft).
Period of record: 1936 to 2025, 90 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

6 days at or beyond a record

The band shows the record high and record low for each calendar day at Ust-Isim. The lines show the 2026 daily maximum and minimum. 6 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Ust-Isim, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	5.9 C (42.6 F)	-48.9 C (-56.0 F)	2.4 C (36.3 F)	-32.6 C (-26.7 F)
Feb	7.2 C (45.0 F)	-45.0 C (-49.0 F)	1.6 C (34.9 F)	-32.4 C (-26.3 F)
Mar	13.9 C (57.0 F)	-40.0 C (-40.0 F)	10.1 C (50.2 F)	-29.3 C (-20.7 F)
Apr	29.8 C (85.6 F)	-27.0 C (-16.6 F)	22.4 C (72.3 F)	-7.5 C (18.5 F)
May	36.6 C (97.9 F)	-11.5 C (11.3 F)	16.5 C (61.7 F)	-2.4 C (27.7 F)
Jun	38.0 C (100.4 F)	-2.8 C (27.0 F)	n/a	n/a
Jul	36.3 C (97.3 F)	0.0 C (32.0 F)	n/a	n/a
Aug	35.0 C (95.0 F)	-2.2 C (28.0 F)	n/a	n/a
Sep	30.3 C (86.5 F)	-8.0 C (17.6 F)	n/a	n/a
Oct	21.1 C (70.0 F)	-27.2 C (-17.0 F)	n/a	n/a
Nov	10.0 C (50.0 F)	-41.7 C (-43.1 F)	n/a	n/a
Dec	6.0 C (42.8 F)	-46.8 C (-52.2 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Ust-Isim still stand. 1969 holds the most, with 64.

Standing records at Ust-Isim by the year they were set
Year set	Standing records
1948	5
1949	9
1950	11
1951	14
1952	25
1953	10
1954	15
1955	15
1956	2
1957	3
1958	8
1959	2
1960	5
1961	7
1962	13
1963	18
1969	64
1970	36
1971	32
1973	28
1974	28
1975	24
1976	37
1977	25
1978	22
1979	35
1980	23
1981	16
1982	38
1983	20
1984	40
1985	14
1986	21
1987	24
1988	13
1989	24
1990	20
1991	21
1992	25
1993	19
1994	18
1995	28
1996	20
1997	36
1998	34
1999	28
2000	19
2001	21
2002	27
2003	20
2004	31
2005	18
2006	44
2007	20
2008	28
2009	23
2010	22
2011	22
2012	28
2013	10
2014	15
2015	22
2016	21
2017	5
2018	3
2019	11
2020	17
2021	11
2022	14
2023	16
2024	7
2025	14

All-Time Record Progression

3 new records

3 all-time records were set at Ust-Isim between 10 October 1977 and 14 July 2014. Each dot is a new record.

When Ust-Isim set new all-time records
Date	Kind	Detail
1977-10-10	Record daily precipitation	Record daily precipitation 55.9 mm (2.2 in)
1998-11-10	Record daily precipitation	Record daily precipitation 61.0 mm (2.4 in)
2014-07-14	Record daily precipitation	Record daily precipitation 71.1 mm (2.8 in)

Wettest Day of Each Month

Jul: 71.1 mm (2.8 in)

The wettest day on record for each calendar month at Ust-Isim. The most was 71.1 mm (2.8 in) on 14 July 2014.

Record daily precipitation for each month at Ust-Isim
Month	Record daily precipitation (mm)	Date
Jan	14.0 mm (0.6 in)	7 January 2017
Feb	16.2 mm (0.6 in)	15 February 1979
Mar	13.0 mm (0.5 in)	17 March 2025
Apr	22.1 mm (0.9 in)	16 April 1999
May	33.8 mm (1.3 in)	31 May 1949
Jun	38.5 mm (1.5 in)	10 June 1947
Jul	71.1 mm (2.8 in)	14 July 2014
Aug	65.0 mm (2.6 in)	23 August 2014
Sep	48.6 mm (1.9 in)	8 September 1949
Oct	55.9 mm (2.2 in)	10 October 1977
Nov	61.0 mm (2.4 in)	10 November 1998
Dec	12.9 mm (0.5 in)	3 December 1962

Period of Record Coverage

1948 to 2025

72 years of record at Ust-Isim, 1948 to 2025. 68 years have data for under 90 percent of days and are left out of rankings: 1948, 1949, 1950, 1951, 1952, 1953, 1954, 1955 and others.

Days with data per year at Ust-Isim
Year	Days with data	Share of year	Complete
1948	65	18%	No
1949	115	32%	No
1950	143	39%	No
1951	113	31%	No
1952	156	43%	No
1953	101	28%	No
1954	123	34%	No
1955	81	22%	No
1956	24	7%	No
1957	54	15%	No
1958	100	27%	No
1959	147	40%	No
1960	142	39%	No
1961	245	67%	No
1962	284	78%	No
1963	290	79%	No
1969	331	91%	Yes
1970	318	87%	No
1971	169	46%	No
1973	298	82%	No
1974	305	84%	No
1975	292	80%	No
1976	303	83%	No
1977	306	84%	No
1978	310	85%	No
1979	304	83%	No
1980	297	81%	No
1981	288	79%	No
1982	276	76%	No
1983	296	81%	No
1984	299	82%	No
1985	295	81%	No
1986	320	88%	No
1987	293	80%	No
1988	289	79%	No
1989	280	77%	No
1990	290	79%	No
1991	200	55%	No
1992	222	61%	No
1993	308	84%	No
1994	305	84%	No
1995	285	78%	No
1996	308	84%	No
1997	307	84%	No
1998	254	70%	No
1999	277	76%	No
2000	321	88%	No
2001	305	84%	No
2002	273	75%	No
2003	314	86%	No
2004	303	83%	No
2005	319	87%	No
2006	312	85%	No
2007	301	82%	No
2008	319	87%	No
2009	318	87%	No
2010	329	90%	Yes
2011	337	92%	Yes
2012	333	91%	Yes
2013	111	30%	No
2014	13	4%	No
2015	264	72%	No
2016	155	42%	No
2017	173	47%	No
2018	170	47%	No
2019	137	38%	No
2020	130	36%	No
2021	160	44%	No
2022	185	51%	No
2023	142	39%	No
2024	127	35%	No
2025	104	28%	No

Latest Records

Latest records at Ust-Isim
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
26 April 2025	Ust-Isim, RU	daily rain	7.9 mm (0.31 in)	2.7 mm (0.11 in)	63 years	20 of 100 (Routine)
12 April 2025	Ust-Isim, RU	daily rain	9.9 mm (0.39 in)	6.9 mm (0.27 in)	56 years	20 of 100 (Routine)
10 April 2025	Ust-Isim, RU	daily high max	22.4 C (72.3 F)	2.5 C (4.5 F)	12 years	13 of 100 (Routine)
3 April 2025	Ust-Isim, RU	daily rain	8.9 mm (0.35 in)	1.0 mm (0.04 in)	74 years	20 of 100 (Routine)
19 March 2025	Ust-Isim, RU	daily high min	0.2 C (32.4 F)	1.3 C (2.3 F)	11 years	11 of 100 (Routine)
18 March 2025	Ust-Isim, RU	daily high min	-0.9 C (30.4 F)	2.0 C (3.6 F)	12 years	12 of 100 (Routine)
17 March 2025	Ust-Isim, RU	monthly rain	13.0 mm (0.5 in)	1.1 mm (0.04 in)	8 years	20 of 100 (Routine)
17 March 2025	Ust-Isim, RU	daily high min	0.2 C (32.4 F)	3.6 C (6.5 F)	2 years	11 of 100 (Routine)
15 March 2025	Ust-Isim, RU	daily high min	0.2 C (32.4 F)	1.0 C (1.8 F)	4 years	9 of 100 (Routine)
13 February 2025	Ust-Isim, RU	daily rain (Tie)	4.8 mm (0.19 in)	tie	26 years	4 of 100 (Routine)
9 February 2025	Ust-Isim, RU	daily high max	-0.5 C (31.1 F)	0.3 C (0.5 F)	23 years	13 of 100 (Routine)
4 February 2025	Ust-Isim, RU	daily high min	-5.1 C (22.8 F)	0.9 C (1.6 F)	30 years	16 of 100 (Routine)
4 February 2025	Ust-Isim, RU	daily high max	-0.9 C (30.4 F)	1.1 C (2.0 F)	3 years	8 of 100 (Routine)
3 February 2025	Ust-Isim, RU	daily high min	-4.5 C (23.9 F)	8.4 C (15.1 F)	30 years	25 of 100 (Routine)
22 January 2025	Ust-Isim, RU	daily rain	4.1 mm (0.16 in)	0.3 mm (0.01 in)	12 years	13 of 100 (Routine)
21 January 2025	Ust-Isim, RU	daily rain	5.1 mm (0.20 in)	0.3 mm (0.01 in)	26 years	17 of 100 (Routine)
10 January 2025	Ust-Isim, RU	daily high max	1.0 C (33.8 F)	3.2 C (5.8 F)	42 years	22 of 100 (Routine)
5 January 2025	Ust-Isim, RU	daily high max	0.2 C (32.4 F)	3.2 C (5.8 F)	47 years	24 of 100 (Routine)
5 January 2025	Ust-Isim, RU	daily high min	-3.0 C (26.6 F)	3.5 C (6.3 F)	5 years	11 of 100 (Routine)
4 January 2025	Ust-Isim, RU	daily high min	-3.3 C (26.1 F)	4.7 C (8.5 F)	47 years	25 of 100 (Routine)

Extremes by Year

1936 to 2025

Yearly extremes at Ust-Isim: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.0 C (100.4 F)	1975	31.6 C (88.9 F)	72
Coldest night (TNn)	-48.9 C (-56.0 F)	1970	-40.0 C (-40.0 F)	70
Wettest day (Rx1day)	71.1 mm (2.8 in)	2014	25.5 mm (1.0 in)	83
Wettest five days (Rx5day)	112.2 mm (4.4 in)	2014	43.4 mm (1.7 in)	78
Longest dry spell (CDD)	63 days	1958	21 days	83

Hottest day (TXx)

The hottest day of the year at Ust-Isim, 1936 to 2025. The record is 38.0 C (100.4 F) in 1975, marked on the chart; the median year is 31.6 C (88.9 F).

Hottest day (TXx) at Ust-Isim by year
Year	Hottest day (TXx)
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	32.2 C (90.0 F)
1949	30.0 C (86.0 F)
1950	30.0 C (86.0 F)
1951	32.2 C (90.0 F)
1952	36.1 C (97.0 F)
1953	31.1 C (88.0 F)
1954	30.0 C (86.0 F)
1955	33.9 C (93.0 F)
1956	30.0 C (86.0 F)
1957	31.1 C (88.0 F)
1958	27.8 C (82.0 F)
1959	27.2 C (81.0 F)
1960	32.2 C (90.0 F)
1961	33.9 C (93.0 F)
1962	31.1 C (88.0 F)
1963	33.9 C (93.0 F)
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	35.0 C (95.0 F)
1970	32.2 C (90.0 F)
1971	30.0 C (86.0 F)
1972	n/a
1973	32.0 C (89.6 F)
1974	34.0 C (93.2 F)
1975	38.0 C (100.4 F)
1976	31.0 C (87.8 F)
1977	31.0 C (87.8 F)
1978	33.0 C (91.4 F)
1979	30.0 C (86.0 F)
1980	31.0 C (87.8 F)
1981	36.0 C (96.8 F)
1982	33.1 C (91.6 F)
1983	34.9 C (94.8 F)
1984	31.1 C (88.0 F)
1985	31.5 C (88.7 F)
1986	29.6 C (85.3 F)
1987	32.5 C (90.5 F)
1988	32.4 C (90.3 F)
1989	36.3 C (97.3 F)
1990	33.4 C (92.1 F)
1991	34.0 C (93.2 F)
1992	30.0 C (86.0 F)
1993	32.7 C (90.9 F)
1994	33.1 C (91.6 F)
1995	33.6 C (92.5 F)
1996	31.5 C (88.7 F)
1997	31.7 C (89.1 F)
1998	35.0 C (95.0 F)
1999	31.2 C (88.2 F)
2000	32.7 C (90.9 F)
2001	33.3 C (91.9 F)
2002	30.0 C (86.0 F)
2003	31.3 C (88.3 F)
2004	36.6 C (97.9 F)
2005	31.0 C (87.8 F)
2006	32.8 C (91.0 F)
2007	33.6 C (92.5 F)
2008	32.3 C (90.1 F)
2009	33.4 C (92.1 F)
2010	34.5 C (94.1 F)
2011	31.5 C (88.7 F)
2012	35.4 C (95.7 F)
2013	22.3 C (72.1 F)
2014	29.4 C (84.9 F)
2015	32.0 C (89.6 F)
2016	18.9 C (66.0 F)
2017	25.3 C (77.5 F)
2018	17.6 C (63.7 F)
2019	22.0 C (71.6 F)
2020	25.5 C (77.9 F)
2021	29.3 C (84.7 F)
2022	26.4 C (79.5 F)
2023	24.0 C (75.2 F)
2024	25.7 C (78.3 F)
2025	22.4 C (72.3 F)

Coldest night (TNn)

The coldest night of the year at Ust-Isim, 1936 to 2025. The record is -48.9 C (-56.0 F) in 1970, marked on the chart; the median year is -40.0 C (-40.0 F).

Coldest night (TNn) at Ust-Isim by year
Year	Coldest night (TNn)
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	-36.1 C (-33.0 F)
1949	-35.0 C (-31.0 F)
1950	-45.0 C (-49.0 F)
1951	-40.0 C (-40.0 F)
1952	-40.0 C (-40.0 F)
1953	-40.0 C (-40.0 F)
1954	-40.0 C (-40.0 F)
1955	-40.0 C (-40.0 F)
1956	-33.9 C (-29.0 F)
1957	n/a
1958	n/a
1959	-37.2 C (-35.0 F)
1960	-32.8 C (-27.0 F)
1961	-36.1 C (-33.0 F)
1962	-37.8 C (-36.0 F)
1963	-36.1 C (-33.0 F)
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	-46.1 C (-51.0 F)
1970	-48.9 C (-56.0 F)
1971	-42.8 C (-45.0 F)
1972	n/a
1973	-47.0 C (-52.6 F)
1974	-44.0 C (-47.2 F)
1975	-41.0 C (-41.8 F)
1976	-45.0 C (-49.0 F)
1977	-43.0 C (-45.4 F)
1978	-41.0 C (-41.8 F)
1979	-47.0 C (-52.6 F)
1980	-37.0 C (-34.6 F)
1981	-33.0 C (-27.4 F)
1982	-37.8 C (-36.0 F)
1983	-35.2 C (-31.4 F)
1984	-45.0 C (-49.0 F)
1985	-35.2 C (-31.4 F)
1986	-43.7 C (-46.7 F)
1987	-39.6 C (-39.3 F)
1988	-35.2 C (-31.4 F)
1989	-41.8 C (-43.2 F)
1990	-45.1 C (-49.2 F)
1991	-40.8 C (-41.4 F)
1992	-37.8 C (-36.0 F)
1993	-37.9 C (-36.2 F)
1994	-42.2 C (-44.0 F)
1995	-33.3 C (-27.9 F)
1996	-46.2 C (-51.2 F)
1997	-43.2 C (-45.8 F)
1998	-41.7 C (-43.1 F)
1999	-42.4 C (-44.3 F)
2000	-38.5 C (-37.3 F)
2001	-44.0 C (-47.2 F)
2002	-39.9 C (-39.8 F)
2003	-40.2 C (-40.4 F)
2004	-35.9 C (-32.6 F)
2005	-37.1 C (-34.8 F)
2006	-46.9 C (-52.4 F)
2007	-38.4 C (-37.1 F)
2008	-33.4 C (-28.1 F)
2009	-42.8 C (-45.0 F)
2010	-43.0 C (-45.4 F)
2011	-37.4 C (-35.3 F)
2012	-37.5 C (-35.5 F)
2013	-39.6 C (-39.3 F)
2014	-39.7 C (-39.5 F)
2015	-43.3 C (-45.9 F)
2016	-46.8 C (-52.2 F)
2017	-40.6 C (-41.1 F)
2018	-39.7 C (-39.5 F)
2019	-42.7 C (-44.9 F)
2020	-37.4 C (-35.3 F)
2021	-44.1 C (-47.4 F)
2022	-34.2 C (-29.6 F)
2023	-40.2 C (-40.4 F)
2024	-36.6 C (-33.9 F)
2025	-32.6 C (-26.7 F)

Wettest day (Rx1day)

The wettest day of the year at Ust-Isim, 1936 to 2025. The record is 71.1 mm (2.8 in) in 2014, marked on the chart; the median year is 25.5 mm (1.0 in).

Wettest day (Rx1day) at Ust-Isim by year
Year	Wettest day (Rx1day)
1936	26.1 mm (1.0 in)
1937	20.7 mm (0.8 in)
1938	31.3 mm (1.2 in)
1939	28.5 mm (1.1 in)
1940	26.4 mm (1.0 in)
1941	21.0 mm (0.8 in)
1942	35.5 mm (1.4 in)
1943	16.2 mm (0.6 in)
1944	32.2 mm (1.3 in)
1945	27.1 mm (1.1 in)
1946	26.2 mm (1.0 in)
1947	38.5 mm (1.5 in)
1948	25.0 mm (1.0 in)
1949	48.6 mm (1.9 in)
1950	18.1 mm (0.7 in)
1951	36.2 mm (1.4 in)
1952	16.7 mm (0.7 in)
1953	20.8 mm (0.8 in)
1954	24.6 mm (1.0 in)
1955	22.8 mm (0.9 in)
1956	19.9 mm (0.8 in)
1957	25.8 mm (1.0 in)
1958	26.2 mm (1.0 in)
1959	20.7 mm (0.8 in)
1960	16.2 mm (0.6 in)
1961	20.9 mm (0.8 in)
1962	20.0 mm (0.8 in)
1963	25.9 mm (1.0 in)
1964	34.9 mm (1.4 in)
1965	45.8 mm (1.8 in)
1966	19.1 mm (0.8 in)
1967	24.5 mm (1.0 in)
1968	29.7 mm (1.2 in)
1969	29.7 mm (1.2 in)
1970	32.1 mm (1.3 in)
1971	27.6 mm (1.1 in)
1972	16.9 mm (0.7 in)
1973	28.8 mm (1.1 in)
1974	25.5 mm (1.0 in)
1975	32.1 mm (1.3 in)
1976	15.1 mm (0.6 in)
1977	55.9 mm (2.2 in)
1978	28.2 mm (1.1 in)
1979	44.0 mm (1.7 in)
1980	34.3 mm (1.4 in)
1981	24.4 mm (1.0 in)
1982	29.7 mm (1.2 in)
1983	30.8 mm (1.2 in)
1984	20.0 mm (0.8 in)
1985	21.3 mm (0.8 in)
1986	19.5 mm (0.8 in)
1987	46.9 mm (1.8 in)
1988	39.4 mm (1.6 in)
1989	19.3 mm (0.8 in)
1990	29.4 mm (1.2 in)
1991	24.4 mm (1.0 in)
1992	32.0 mm (1.3 in)
1993	27.9 mm (1.1 in)
1994	50.4 mm (2.0 in)
1995	26.1 mm (1.0 in)
1996	34.0 mm (1.3 in)
1997	17.0 mm (0.7 in)
1998	61.0 mm (2.4 in)
1999	48.0 mm (1.9 in)
2000	0.0 mm (0.00 in)
2001	n/a
2002	0.0 mm (0.00 in)
2003	0.0 mm (0.00 in)
2004	0.0 mm (0.00 in)
2005	0.0 mm (0.00 in)
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	n/a
2012	22.4 mm (0.9 in)
2013	33.0 mm (1.3 in)
2014	71.1 mm (2.8 in)
2015	41.9 mm (1.6 in)
2016	11.9 mm (0.5 in)
2017	14.0 mm (0.6 in)
2018	11.9 mm (0.5 in)
2019	13.0 mm (0.5 in)
2020	21.1 mm (0.8 in)
2021	7.9 mm (0.31 in)
2022	10.9 mm (0.4 in)
2023	11.9 mm (0.5 in)
2024	14.0 mm (0.6 in)
2025	13.0 mm (0.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Ust-Isim, 1936 to 2025. The record is 112.2 mm (4.4 in) in 2014, marked on the chart; the median year is 43.4 mm (1.7 in).

Wettest five days (Rx5day) at Ust-Isim by year
Year	Wettest five days (Rx5day)
1936	42.6 mm (1.7 in)
1937	39.8 mm (1.6 in)
1938	42.0 mm (1.7 in)
1939	52.7 mm (2.1 in)
1940	61.6 mm (2.4 in)
1941	28.9 mm (1.1 in)
1942	76.0 mm (3.0 in)
1943	38.1 mm (1.5 in)
1944	69.3 mm (2.7 in)
1945	36.4 mm (1.4 in)
1946	37.0 mm (1.5 in)
1947	75.1 mm (3.0 in)
1948	33.3 mm (1.3 in)
1949	70.0 mm (2.8 in)
1950	56.8 mm (2.2 in)
1951	36.7 mm (1.4 in)
1952	27.5 mm (1.1 in)
1953	34.3 mm (1.4 in)
1954	64.0 mm (2.5 in)
1955	55.5 mm (2.2 in)
1956	33.5 mm (1.3 in)
1957	66.0 mm (2.6 in)
1958	29.9 mm (1.2 in)
1959	42.8 mm (1.7 in)
1960	34.0 mm (1.3 in)
1961	38.6 mm (1.5 in)
1962	45.5 mm (1.8 in)
1963	39.9 mm (1.6 in)
1964	48.0 mm (1.9 in)
1965	72.2 mm (2.8 in)
1966	37.7 mm (1.5 in)
1967	56.6 mm (2.2 in)
1968	43.8 mm (1.7 in)
1969	54.1 mm (2.1 in)
1970	43.7 mm (1.7 in)
1971	62.8 mm (2.5 in)
1972	26.6 mm (1.0 in)
1973	51.1 mm (2.0 in)
1974	38.0 mm (1.5 in)
1975	55.3 mm (2.2 in)
1976	30.3 mm (1.2 in)
1977	68.6 mm (2.7 in)
1978	51.6 mm (2.0 in)
1979	74.7 mm (2.9 in)
1980	53.9 mm (2.1 in)
1981	45.8 mm (1.8 in)
1982	45.0 mm (1.8 in)
1983	45.9 mm (1.8 in)
1984	43.0 mm (1.7 in)
1985	53.5 mm (2.1 in)
1986	27.9 mm (1.1 in)
1987	87.4 mm (3.4 in)
1988	48.4 mm (1.9 in)
1989	35.8 mm (1.4 in)
1990	47.4 mm (1.9 in)
1991	44.4 mm (1.7 in)
1992	56.9 mm (2.2 in)
1993	8.1 mm (0.32 in)
1994	72.8 mm (2.9 in)
1995	38.8 mm (1.5 in)
1996	40.1 mm (1.6 in)
1997	16.5 mm (0.6 in)
1998	79.0 mm (3.1 in)
1999	111.0 mm (4.4 in)
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	n/a
2012	31.8 mm (1.3 in)
2013	48.5 mm (1.9 in)
2014	112.2 mm (4.4 in)
2015	53.1 mm (2.1 in)
2016	22.5 mm (0.9 in)
2017	25.2 mm (1.0 in)
2018	26.2 mm (1.0 in)
2019	26.0 mm (1.0 in)
2020	38.7 mm (1.5 in)
2021	15.8 mm (0.6 in)
2022	17.3 mm (0.7 in)
2023	22.3 mm (0.9 in)
2024	26.6 mm (1.0 in)
2025	27.2 mm (1.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Ust-Isim, 1936 to 2025. The record is 63 days in 1958, marked on the chart; the median year is 21 days.

Longest dry spell (CDD) at Ust-Isim by year
Year	Longest dry spell (CDD)
1936	21 days
1937	29 days
1938	38 days
1939	17 days
1940	22 days
1941	17 days
1942	35 days
1943	23 days
1944	20 days
1945	31 days
1946	27 days
1947	27 days
1948	20 days
1949	35 days
1950	27 days
1951	30 days
1952	48 days
1953	31 days
1954	27 days
1955	24 days
1956	33 days
1957	21 days
1958	63 days
1959	18 days
1960	32 days
1961	18 days
1962	18 days
1963	25 days
1964	37 days
1965	20 days
1966	26 days
1967	23 days
1968	23 days
1969	20 days
1970	37 days
1971	22 days
1972	17 days
1973	28 days
1974	34 days
1975	18 days
1976	50 days
1977	14 days
1978	20 days
1979	21 days
1980	29 days
1981	22 days
1982	14 days
1983	17 days
1984	33 days
1985	36 days
1986	23 days
1987	46 days
1988	31 days
1989	25 days
1990	20 days
1991	24 days
1992	23 days
1993	8 days
1994	18 days
1995	21 days
1996	10 days
1997	8 days
1998	12 days
1999	15 days
2000	2 days
2001	n/a
2002	1 day
2003	1 day
2004	1 day
2005	1 day
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	n/a
2012	19 days
2013	13 days
2014	20 days
2015	20 days
2016	20 days
2017	19 days
2018	16 days
2019	36 days
2020	13 days
2021	11 days
2022	14 days
2023	24 days
2024	10 days
2025	11 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.

Rainfall Return Levels

61 years, 1936 to 2015

A day with at least 26.6 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 59.6 mm (2.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Ust-Isim: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	26.6 mm (1.0 in)
5 years	34.8 mm (1.4 in)
10 years	40.5 mm (1.6 in)
25 years	48.0 mm (1.9 in)
50 years	53.7 mm (2.1 in)
100 years	59.6 mm (2.3 in)	Longer than the 61 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, 61 years of values from 1936 to 2015.

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: 55.9 mm (2.2 in) in 1977; 50.4 mm (2.0 in) in 1994; 48.6 mm (1.9 in) in 1949.

Download the Data

Data for Ust-Isim standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ust-Isim 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).