Hysham Weather Records (USC00244358)

Record envelope, standing records and threshold days for Hysham (USC00244358), Montana, United States, with 82 years of record.

Key Facts for Hysham

Hysham (USC00244358) is a weather station in Montana, United States at 46.29 latitude and -107.23 longitude, 814 m (2,669 ft) above sea level.
The station reports from 1945 to 2026, 82 years of record.
1,464 records set at Hysham still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Hysham set a daily record precipitation of 45.2 mm (1.8 in) on 20 September 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

Location: Montana, United States, 46.29 latitude, -107.23 longitude.
Elevation: 814 m (2,669 ft).
Period of record: 1945 to 2026, 82 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

20 days at or beyond a record

The band shows the record high and record low for each calendar day at Hysham. The lines show the 2026 daily maximum and minimum. 20 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Hysham, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	22.2 C (72.0 F)	-44.4 C (-47.9 F)	17.2 C (63.0 F)	-32.2 C (-26.0 F)
Feb	23.9 C (75.0 F)	-38.9 C (-38.0 F)	23.3 C (73.9 F)	-22.2 C (-8.0 F)
Mar	29.4 C (84.9 F)	-37.8 C (-36.0 F)	28.3 C (82.9 F)	-27.2 C (-17.0 F)
Apr	36.1 C (97.0 F)	-15.6 C (3.9 F)	30.0 C (86.0 F)	-12.8 C (9.0 F)
May	37.8 C (100.0 F)	-10.0 C (14.0 F)	35.0 C (95.0 F)	-6.7 C (19.9 F)
Jun	41.7 C (107.1 F)	-1.7 C (28.9 F)	32.2 C (90.0 F)	4.4 C (39.9 F)
Jul	43.9 C (111.0 F)	2.8 C (37.0 F)	42.2 C (108.0 F)	12.2 C (54.0 F)
Aug	42.2 C (108.0 F)	0.0 C (32.0 F)	40.0 C (104.0 F)	6.1 C (43.0 F)
Sep	40.6 C (105.1 F)	-7.2 C (19.0 F)	35.0 C (95.0 F)	5.0 C (41.0 F)
Oct	33.9 C (93.0 F)	-22.8 C (-9.0 F)	25.0 C (77.0 F)	4.4 C (39.9 F)
Nov	26.1 C (79.0 F)	-35.0 C (-31.0 F)	n/a	n/a
Dec	21.1 C (70.0 F)	-43.3 C (-45.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Hysham still stand. 1985 holds the most, with 41.

Standing records at Hysham by the year they were set
Year set	Standing records
1945	3
1946	20
1947	22
1948	22
1949	23
1950	36
1951	34
1952	19
1953	15
1954	30
1955	23
1956	11
1957	8
1958	14
1959	14
1960	23
1961	20
1962	17
1963	22
1964	13
1965	20
1966	18
1967	12
1968	12
1969	24
1970	7
1971	9
1972	25
1973	15
1974	14
1975	9
1976	13
1977	18
1978	15
1979	18
1980	28
1981	15
1982	12
1983	27
1984	19
1985	41
1986	20
1987	14
1988	24
1989	20
1990	21
1991	19
1992	34
1993	23
1994	13
1995	19
1996	22
1997	22
1998	12
1999	11
2000	16
2001	11
2002	28
2003	22
2004	17
2005	13
2006	12
2007	15
2008	11
2009	14
2010	8
2011	6
2012	23
2013	16
2014	13
2015	16
2016	15
2017	14
2018	14
2019	9
2020	25
2021	25
2022	24
2023	17
2024	14
2025	10
2026	22

All-Time Record Progression

8 new records

8 all-time records were set at Hysham between 24 December 1983 and 9 February 2018. Each dot is a new record.

When Hysham set new all-time records
Date	Kind	Detail
1983-12-24	Record low maximum temperature	Record low maximum temperature -28.9 C (-20.0 F)
2008-12-26	Record snow depth	Record snow depth 30.5 cm (12.0 in)
2012-01-19	Record snow depth	Record snow depth 38.1 cm (15.0 in)
2012-01-20	Record snow depth	Record snow depth 50.8 cm (20.0 in)
2013-05-30	Record daily precipitation	Record daily precipitation 81.3 mm (3.2 in)
2017-07-04	Record high minimum temperature	Record high minimum temperature 23.9 C (75.0 F)
2018-02-08	Record snow depth	Record snow depth 58.4 cm (23.0 in)
2018-02-09	Record snow depth	Record snow depth 71.1 cm (28.0 in)

Wettest Day of Each Month

May: 81.3 mm (3.2 in)

The wettest day on record for each calendar month at Hysham. The most was 81.3 mm (3.2 in) on 30 May 2013.

Record daily precipitation for each month at Hysham
Month	Record daily precipitation (mm)	Date
Jan	25.9 mm (1.0 in)	27 January 1971
Feb	17.8 mm (0.7 in)	20 February 1993
Mar	31.8 mm (1.3 in)	30 March 2006
Apr	41.9 mm (1.6 in)	28 April 1970
May	81.3 mm (3.2 in)	30 May 2013
Jun	46.0 mm (1.8 in)	21 June 1957
Jul	57.7 mm (2.3 in)	3 July 1993
Aug	73.7 mm (2.9 in)	24 August 2014
Sep	77.5 mm (3.1 in)	10 September 1961
Oct	40.6 mm (1.6 in)	22 October 1980
Nov	38.1 mm (1.5 in)	1 November 1957
Dec	20.3 mm (0.8 in)	3 December 2013

Period of Record Coverage

1945 to 2026

82 years of record at Hysham, 1945 to 2026. 9 years have data for under 90 percent of days and are left out of rankings: 1945, 1959, 1964, 1968, 1987, 1988, 2009, 2010 and others.

Days with data per year at Hysham
Year	Days with data	Share of year	Complete
1945	56	15%	No
1946	363	99%	Yes
1947	362	99%	Yes
1948	366	100%	Yes
1949	362	99%	Yes
1950	365	100%	Yes
1951	335	92%	Yes
1952	365	100%	Yes
1953	361	99%	Yes
1954	360	99%	Yes
1955	361	99%	Yes
1956	360	98%	Yes
1957	362	99%	Yes
1958	362	99%	Yes
1959	327	90%	No
1960	360	98%	Yes
1961	362	99%	Yes
1962	365	100%	Yes
1963	362	99%	Yes
1964	305	83%	No
1965	364	100%	Yes
1966	339	93%	Yes
1967	333	91%	Yes
1968	323	88%	No
1969	358	98%	Yes
1970	364	100%	Yes
1971	360	99%	Yes
1972	366	100%	Yes
1973	361	99%	Yes
1974	364	100%	Yes
1975	364	100%	Yes
1976	361	99%	Yes
1977	362	99%	Yes
1978	364	100%	Yes
1979	359	98%	Yes
1980	364	99%	Yes
1981	363	99%	Yes
1982	351	96%	Yes
1983	357	98%	Yes
1984	363	99%	Yes
1985	351	96%	Yes
1986	348	95%	Yes
1987	320	88%	No
1988	304	83%	No
1989	361	99%	Yes
1990	363	99%	Yes
1991	357	98%	Yes
1992	364	99%	Yes
1993	364	100%	Yes
1994	362	99%	Yes
1995	356	98%	Yes
1996	364	99%	Yes
1997	360	99%	Yes
1998	361	99%	Yes
1999	364	100%	Yes
2000	355	97%	Yes
2001	360	99%	Yes
2002	361	99%	Yes
2003	357	98%	Yes
2004	347	95%	Yes
2005	354	97%	Yes
2006	354	97%	Yes
2007	357	98%	Yes
2008	355	97%	Yes
2009	313	86%	No
2010	325	89%	No
2011	350	96%	Yes
2012	364	99%	Yes
2013	362	99%	Yes
2014	362	99%	Yes
2015	358	98%	Yes
2016	363	99%	Yes
2017	361	99%	Yes
2018	360	99%	Yes
2019	364	100%	Yes
2020	366	100%	Yes
2021	363	99%	Yes
2022	353	97%	Yes
2023	365	100%	Yes
2024	347	95%	Yes
2025	365	100%	Yes
2026	254	70%	No

Latest Records

Latest records at Hysham
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 September 2026	Hysham, US	daily rain (Provisional)	45.2 mm (1.8 in)	30.0 mm (1.2 in)	56 years	57 of 100 (Notable)
19 September 2026	Hysham, US	daily rain (Provisional)	29.2 mm (1.1 in)	3.8 mm (0.15 in)	43 years	24 of 100 (Routine)
3 August 2026	Hysham, US	daily high min (Tie)	18.9 C (66.0 F)	tie	23 years	3 of 100 (Routine)
2 August 2026	Hysham, US	daily high max	40.0 C (104.0 F)	1.1 C (2.0 F)	68 years	30 of 100 (Routine)
31 July 2026	Hysham, US	daily high min	22.2 C (72.0 F)	1.1 C (2.0 F)	3 years	11 of 100 (Routine)
17 July 2026	Hysham, US	daily rain	41.4 mm (1.6 in)	24.9 mm (1.0 in)	44 years	51 of 100 (Notable)
13 July 2026	Hysham, US	daily high max	42.2 C (108.0 F)	2.2 C (4.0 F)	24 years	20 of 100 (Routine)
28 June 2026	Hysham, US	daily rain	16.8 mm (0.7 in)	3.1 mm (0.12 in)	8 years	14 of 100 (Routine)
31 May 2026	Hysham, US	daily high min	15.6 C (60.1 F)	1.2 C (2.2 F)	63 years	28 of 100 (Routine)
29 May 2026	Hysham, US	daily high min	16.7 C (62.1 F)	1.1 C (2.0 F)	64 years	29 of 100 (Routine)
20 May 2026	Hysham, US	daily low min	-3.3 C (26.1 F)	1.1 C (2.0 F)	23 years	16 of 100 (Routine)
18 May 2026	Hysham, US	daily low min	-6.7 C (19.9 F)	4.5 C (8.1 F)	60 years	37 of 100 (Notable)
14 May 2026	Hysham, US	daily high max	35.0 C (95.0 F)	2.8 C (5.0 F)	41 years	24 of 100 (Routine)
7 May 2026	Hysham, US	daily low min (Tie)	-5.0 C (23.0 F)	tie	16 years	3 of 100 (Routine)
6 May 2026	Hysham, US	daily low min (Tie)	-2.8 C (27.0 F)	tie	64 years	6 of 100 (Routine)
27 April 2026	Hysham, US	daily snow depth	10.2 cm (4.0 in)	10.2 cm (4.0 in)	76 years	44 of 100 (Notable)
24 April 2026	Hysham, US	daily low min	-9.4 C (15.1 F)	4.4 C (7.9 F)	68 years	38 of 100 (Notable)
22 April 2026	Hysham, US	daily high max (Tie)	29.4 C (84.9 F)	tie	40 years	5 of 100 (Routine)
13 April 2026	Hysham, US	daily high min (Tie)	8.9 C (48.0 F)	tie	49 years	5 of 100 (Routine)
4 April 2026	Hysham, US	daily low min	-12.8 C (9.0 F)	0.6 C (1.1 F)	5 years	10 of 100 (Routine)

Climate Trend

69 complete years, 1946 to 2025

One stripe for each of 69 complete years at Hysham, 1946 to 2025. Blue stripes are years cooler than the station's own mean of 8.4 C (47.1 F); red stripes are warmer. The coolest year was 1950, at 5.8 C (42.5 F), and the warmest was 2007, at 10.2 C (50.3 F). The strongest colour marks a difference of 2.6 C (4.7 F).

Annual mean temperature at Hysham as warming stripes, 1946 to 2025
Year	Annual mean temperature	Difference from the station mean
1946	8.5 C	+0.13 C
1947	7.8 C	-0.55 C
1948	7.9 C	-0.53 C
1949	6.6 C	-1.79 C
1950	5.8 C	-2.56 C
1952	8.5 C	+0.09 C
1953	10.2 C	+1.76 C
1954	8.9 C	+0.48 C
1955	7.2 C	-1.21 C
1956	8.1 C	-0.30 C
1957	7.6 C	-0.79 C
1958	8.3 C	-0.06 C
1960	8.3 C	-0.12 C
1961	9.1 C	+0.68 C
1962	8.2 C	-0.23 C
1963	9.1 C	+0.74 C
1965	7.1 C	-1.29 C
1969	7.1 C	-1.28 C
1970	8.2 C	-0.16 C
1971	7.6 C	-0.83 C
1972	7.0 C	-1.37 C
1973	8.6 C	+0.21 C
1974	9.2 C	+0.79 C
1975	6.8 C	-1.62 C
1976	9.1 C	+0.75 C
1977	8.5 C	+0.15 C
1978	6.2 C	-2.17 C
1980	9.2 C	+0.83 C
1981	10.0 C	+1.58 C
1982	7.1 C	-1.32 C
1983	8.7 C	+0.35 C
1984	8.6 C	+0.17 C
1985	6.7 C	-1.72 C
1986	9.4 C	+1.03 C
1987	9.7 C	+1.35 C
1989	7.1 C	-1.29 C
1990	9.0 C	+0.60 C
1991	8.9 C	+0.47 C
1992	9.1 C	+0.71 C
1993	6.4 C	-1.97 C
1994	8.3 C	-0.12 C
1995	8.2 C	-0.23 C
1996	6.2 C	-2.18 C
1997	8.7 C	+0.33 C
1998	9.4 C	+0.96 C
1999	9.7 C	+1.34 C
2000	8.3 C	-0.05 C
2001	9.3 C	+0.93 C
2002	8.4 C	+0.03 C
2003	8.9 C	+0.49 C
2004	8.8 C	+0.37 C
2005	9.1 C	+0.66 C
2006	10.2 C	+1.78 C
2007	10.2 C	+1.80 C
2008	8.2 C	-0.20 C
2010	7.7 C	-0.65 C
2011	8.4 C	0.00 C
2012	10.1 C	+1.73 C
2013	8.8 C	+0.41 C
2014	8.1 C	-0.25 C
2015	9.6 C	+1.22 C
2016	9.7 C	+1.27 C
2017	8.9 C	+0.49 C
2018	7.1 C	-1.29 C
2019	6.8 C	-1.56 C
2020	8.7 C	+0.34 C
2021	8.8 C	+0.43 C
2023	9.8 C	+1.38 C
2025	9.4 C	+1.04 C

The annual mean temperature here has risen by 0.14 C (0.03 to 0.25) per decade over 1946 to 2025. In Fahrenheit: 0.3 F (0.1 to 0.5) per decade. The slope is a straight line fitted to 69 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Hysham
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.14 C (0.03 to 0.25) per decade	0.3 F (0.1 to 0.5) per decade	1946 to 2025	69	Rise
Mean daily maximum	-0.10 C (-0.23 to 0.03) per decade	-0.2 F (-0.4 to 0.1) per decade	1946 to 2025	69	Not clearly different from zero
Mean daily minimum	0.4 C (0.3 to 0.5) per decade	0.7 F (0.5 to 0.9) per decade	1946 to 2025	69	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

1945 to 2026

Yearly extremes at Hysham: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.9 C (111.0 F)	1947	38.9 C (102.0 F)	82
Coldest night (TNn)	-44.4 C (-47.9 F)	1954	-33.3 C (-27.9 F)	82
Wettest day (Rx1day)	81.3 mm (3.2 in)	2013	31.8 mm (1.3 in)	82
Wettest five days (Rx5day)	133.4 mm (5.3 in)	2014	49.3 mm (1.9 in)	82
Longest dry spell (CDD)	93 days	1987	34 days	82

Hottest day (TXx)

The hottest day of the year at Hysham, 1945 to 2026. The record is 43.9 C (111.0 F) in 1947, marked on the chart; the median year is 38.9 C (102.0 F).

Hottest day (TXx) at Hysham by year
Year	Hottest day (TXx)
1945	20.0 C (68.0 F)
1946	38.3 C (100.9 F)
1947	43.9 C (111.0 F)
1948	40.0 C (104.0 F)
1949	42.2 C (108.0 F)
1950	38.9 C (102.0 F)
1951	40.0 C (104.0 F)
1952	40.0 C (104.0 F)
1953	41.7 C (107.1 F)
1954	41.1 C (106.0 F)
1955	41.7 C (107.1 F)
1956	40.6 C (105.1 F)
1957	40.0 C (104.0 F)
1958	38.9 C (102.0 F)
1959	40.6 C (105.1 F)
1960	42.2 C (108.0 F)
1961	42.2 C (108.0 F)
1962	39.4 C (102.9 F)
1963	40.6 C (105.1 F)
1964	40.0 C (104.0 F)
1965	40.6 C (105.1 F)
1966	41.7 C (107.1 F)
1967	37.8 C (100.0 F)
1968	36.7 C (98.1 F)
1969	40.6 C (105.1 F)
1970	39.4 C (102.9 F)
1971	40.0 C (104.0 F)
1972	37.2 C (99.0 F)
1973	38.9 C (102.0 F)
1974	36.1 C (97.0 F)
1975	38.3 C (100.9 F)
1976	39.4 C (102.9 F)
1977	39.4 C (102.9 F)
1978	38.3 C (100.9 F)
1979	37.8 C (100.0 F)
1980	41.1 C (106.0 F)
1981	37.8 C (100.0 F)
1982	37.8 C (100.0 F)
1983	41.1 C (106.0 F)
1984	39.4 C (102.9 F)
1985	40.0 C (104.0 F)
1986	38.9 C (102.0 F)
1987	36.7 C (98.1 F)
1988	41.1 C (106.0 F)
1989	38.3 C (100.9 F)
1990	38.3 C (100.9 F)
1991	36.7 C (98.1 F)
1992	36.1 C (97.0 F)
1993	34.4 C (93.9 F)
1994	35.6 C (96.1 F)
1995	38.9 C (102.0 F)
1996	37.2 C (99.0 F)
1997	36.1 C (97.0 F)
1998	37.8 C (100.0 F)
1999	38.9 C (102.0 F)
2000	37.8 C (100.0 F)
2001	38.9 C (102.0 F)
2002	42.2 C (108.0 F)
2003	38.3 C (100.9 F)
2004	38.3 C (100.9 F)
2005	37.8 C (100.0 F)
2006	37.8 C (100.0 F)
2007	40.0 C (104.0 F)
2008	37.2 C (99.0 F)
2009	35.0 C (95.0 F)
2010	38.3 C (100.9 F)
2011	36.1 C (97.0 F)
2012	38.9 C (102.0 F)
2013	35.0 C (95.0 F)
2014	37.2 C (99.0 F)
2015	37.2 C (99.0 F)
2016	36.1 C (97.0 F)
2017	37.8 C (100.0 F)
2018	36.1 C (97.0 F)
2019	36.1 C (97.0 F)
2020	38.3 C (100.9 F)
2021	41.7 C (107.1 F)
2022	40.0 C (104.0 F)
2023	38.3 C (100.9 F)
2024	38.9 C (102.0 F)
2025	38.3 C (100.9 F)
2026	42.2 C (108.0 F)

Coldest night (TNn)

The coldest night of the year at Hysham, 1945 to 2026. The record is -44.4 C (-47.9 F) in 1954, marked on the chart; the median year is -33.3 C (-27.9 F).

Coldest night (TNn) at Hysham by year
Year	Coldest night (TNn)
1945	-37.8 C (-36.0 F)
1946	-32.8 C (-27.0 F)
1947	-33.9 C (-29.0 F)
1948	-30.6 C (-23.1 F)
1949	-38.9 C (-38.0 F)
1950	-36.7 C (-34.1 F)
1951	-34.4 C (-29.9 F)
1952	-37.8 C (-36.0 F)
1953	-26.1 C (-15.0 F)
1954	-44.4 C (-47.9 F)
1955	-33.3 C (-27.9 F)
1956	-32.2 C (-26.0 F)
1957	-40.6 C (-41.1 F)
1958	-28.3 C (-18.9 F)
1959	-33.3 C (-27.9 F)
1960	-32.8 C (-27.0 F)
1961	-27.8 C (-18.0 F)
1962	-34.4 C (-29.9 F)
1963	-36.7 C (-34.1 F)
1964	-35.0 C (-31.0 F)
1965	-30.0 C (-22.0 F)
1966	-29.4 C (-20.9 F)
1967	-23.3 C (-9.9 F)
1968	-34.4 C (-29.9 F)
1969	-40.6 C (-41.1 F)
1970	-31.1 C (-24.0 F)
1971	-38.9 C (-38.0 F)
1972	-36.1 C (-33.0 F)
1973	-31.7 C (-25.1 F)
1974	-33.9 C (-29.0 F)
1975	-31.7 C (-25.1 F)
1976	-34.4 C (-29.9 F)
1977	-35.6 C (-32.1 F)
1978	-33.3 C (-27.9 F)
1979	-36.7 C (-34.1 F)
1980	-30.6 C (-23.1 F)
1981	-28.9 C (-20.0 F)
1982	-37.2 C (-35.0 F)
1983	-41.7 C (-43.1 F)
1984	-33.9 C (-29.0 F)
1985	-38.9 C (-38.0 F)
1986	-31.7 C (-25.1 F)
1987	-22.2 C (-8.0 F)
1988	-29.4 C (-20.9 F)
1989	-43.3 C (-45.9 F)
1990	-36.1 C (-33.0 F)
1991	-31.1 C (-24.0 F)
1992	-31.7 C (-25.1 F)
1993	-32.2 C (-26.0 F)
1994	-33.3 C (-27.9 F)
1995	-28.9 C (-20.0 F)
1996	-38.3 C (-36.9 F)
1997	-37.2 C (-35.0 F)
1998	-36.7 C (-34.1 F)
1999	-20.6 C (-5.1 F)
2000	-27.8 C (-18.0 F)
2001	-27.8 C (-18.0 F)
2002	-30.0 C (-22.0 F)
2003	-29.4 C (-20.9 F)
2004	-31.1 C (-24.0 F)
2005	-36.1 C (-33.0 F)
2006	-28.3 C (-18.9 F)
2007	-31.7 C (-25.1 F)
2008	-29.4 C (-20.9 F)
2009	-29.4 C (-20.9 F)
2010	-31.1 C (-24.0 F)
2011	-33.9 C (-29.0 F)
2012	-23.3 C (-9.9 F)
2013	-33.3 C (-27.9 F)
2014	-32.2 C (-26.0 F)
2015	-28.3 C (-18.9 F)
2016	-36.1 C (-33.0 F)
2017	-30.0 C (-22.0 F)
2018	-34.4 C (-29.9 F)
2019	-37.8 C (-36.0 F)
2020	-23.9 C (-11.0 F)
2021	-38.3 C (-36.9 F)
2022	-33.3 C (-27.9 F)
2023	-30.0 C (-22.0 F)
2024	-37.8 C (-36.0 F)
2025	-36.7 C (-34.1 F)
2026	-32.2 C (-26.0 F)

Wettest day (Rx1day)

The wettest day of the year at Hysham, 1945 to 2026. The record is 81.3 mm (3.2 in) in 2013, marked on the chart; the median year is 31.8 mm (1.3 in).

Wettest day (Rx1day) at Hysham by year
Year	Wettest day (Rx1day)
1945	7.1 mm (0.28 in)
1946	33.8 mm (1.3 in)
1947	17.0 mm (0.7 in)
1948	27.9 mm (1.1 in)
1949	24.1 mm (0.9 in)
1950	35.6 mm (1.4 in)
1951	31.0 mm (1.2 in)
1952	16.5 mm (0.6 in)
1953	27.9 mm (1.1 in)
1954	22.9 mm (0.9 in)
1955	23.4 mm (0.9 in)
1956	36.1 mm (1.4 in)
1957	46.0 mm (1.8 in)
1958	30.5 mm (1.2 in)
1959	19.1 mm (0.8 in)
1960	14.5 mm (0.6 in)
1961	77.5 mm (3.1 in)
1962	45.2 mm (1.8 in)
1963	33.5 mm (1.3 in)
1964	43.2 mm (1.7 in)
1965	27.9 mm (1.1 in)
1966	50.8 mm (2.0 in)
1967	34.3 mm (1.4 in)
1968	31.8 mm (1.3 in)
1969	29.2 mm (1.1 in)
1970	41.9 mm (1.6 in)
1971	43.2 mm (1.7 in)
1972	24.4 mm (1.0 in)
1973	25.4 mm (1.0 in)
1974	27.9 mm (1.1 in)
1975	57.2 mm (2.3 in)
1976	30.5 mm (1.2 in)
1977	55.1 mm (2.2 in)
1978	50.8 mm (2.0 in)
1979	31.8 mm (1.3 in)
1980	40.6 mm (1.6 in)
1981	38.1 mm (1.5 in)
1982	45.0 mm (1.8 in)
1983	25.4 mm (1.0 in)
1984	18.3 mm (0.7 in)
1985	38.1 mm (1.5 in)
1986	57.2 mm (2.3 in)
1987	27.9 mm (1.1 in)
1988	34.3 mm (1.4 in)
1989	27.9 mm (1.1 in)
1990	18.3 mm (0.7 in)
1991	45.7 mm (1.8 in)
1992	28.2 mm (1.1 in)
1993	57.7 mm (2.3 in)
1994	25.4 mm (1.0 in)
1995	32.3 mm (1.3 in)
1996	22.9 mm (0.9 in)
1997	47.0 mm (1.9 in)
1998	38.1 mm (1.5 in)
1999	31.8 mm (1.3 in)
2000	19.8 mm (0.8 in)
2001	36.1 mm (1.4 in)
2002	26.2 mm (1.0 in)
2003	20.8 mm (0.8 in)
2004	40.6 mm (1.6 in)
2005	28.4 mm (1.1 in)
2006	31.8 mm (1.3 in)
2007	24.1 mm (0.9 in)
2008	29.5 mm (1.2 in)
2009	39.4 mm (1.6 in)
2010	35.6 mm (1.4 in)
2011	50.8 mm (2.0 in)
2012	15.2 mm (0.6 in)
2013	81.3 mm (3.2 in)
2014	73.7 mm (2.9 in)
2015	16.8 mm (0.7 in)
2016	33.8 mm (1.3 in)
2017	40.6 mm (1.6 in)
2018	18.3 mm (0.7 in)
2019	51.3 mm (2.0 in)
2020	24.1 mm (0.9 in)
2021	20.8 mm (0.8 in)
2022	23.4 mm (0.9 in)
2023	52.1 mm (2.1 in)
2024	38.1 mm (1.5 in)
2025	38.1 mm (1.5 in)
2026	45.2 mm (1.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Hysham, 1945 to 2026. The record is 133.4 mm (5.3 in) in 2014, marked on the chart; the median year is 49.3 mm (1.9 in).

Wettest five days (Rx5day) at Hysham by year
Year	Wettest five days (Rx5day)
1945	10.2 mm (0.4 in)
1946	68.3 mm (2.7 in)
1947	33.5 mm (1.3 in)
1948	43.4 mm (1.7 in)
1949	49.7 mm (2.0 in)
1950	40.5 mm (1.6 in)
1951	60.4 mm (2.4 in)
1952	25.9 mm (1.0 in)
1953	38.3 mm (1.5 in)
1954	33.6 mm (1.3 in)
1955	31.6 mm (1.2 in)
1956	46.3 mm (1.8 in)
1957	77.1 mm (3.0 in)
1958	46.5 mm (1.8 in)
1959	30.5 mm (1.2 in)
1960	23.8 mm (0.9 in)
1961	93.2 mm (3.7 in)
1962	62.5 mm (2.5 in)
1963	75.7 mm (3.0 in)
1964	63.5 mm (2.5 in)
1965	48.8 mm (1.9 in)
1966	50.8 mm (2.0 in)
1967	42.7 mm (1.7 in)
1968	54.7 mm (2.2 in)
1969	60.9 mm (2.4 in)
1970	70.4 mm (2.8 in)
1971	66.0 mm (2.6 in)
1972	36.6 mm (1.4 in)
1973	61.0 mm (2.4 in)
1974	49.2 mm (1.9 in)
1975	58.5 mm (2.3 in)
1976	52.1 mm (2.1 in)
1977	118.3 mm (4.7 in)
1978	92.2 mm (3.6 in)
1979	41.5 mm (1.6 in)
1980	40.6 mm (1.6 in)
1981	75.8 mm (3.0 in)
1982	74.2 mm (2.9 in)
1983	48.2 mm (1.9 in)
1984	29.2 mm (1.1 in)
1985	58.5 mm (2.3 in)
1986	90.1 mm (3.5 in)
1987	40.8 mm (1.6 in)
1988	35.8 mm (1.4 in)
1989	46.7 mm (1.8 in)
1990	21.1 mm (0.8 in)
1991	67.0 mm (2.6 in)
1992	42.4 mm (1.7 in)
1993	87.4 mm (3.4 in)
1994	37.6 mm (1.5 in)
1995	59.5 mm (2.3 in)
1996	49.3 mm (1.9 in)
1997	71.6 mm (2.8 in)
1998	48.7 mm (1.9 in)
1999	52.6 mm (2.1 in)
2000	24.3 mm (1.0 in)
2001	53.6 mm (2.1 in)
2002	30.5 mm (1.2 in)
2003	33.0 mm (1.3 in)
2004	43.9 mm (1.7 in)
2005	60.9 mm (2.4 in)
2006	47.5 mm (1.9 in)
2007	53.4 mm (2.1 in)
2008	73.7 mm (2.9 in)
2009	41.0 mm (1.6 in)
2010	58.0 mm (2.3 in)
2011	86.1 mm (3.4 in)
2012	36.0 mm (1.4 in)
2013	131.3 mm (5.2 in)
2014	133.4 mm (5.3 in)
2015	23.9 mm (0.9 in)
2016	63.7 mm (2.5 in)
2017	47.2 mm (1.9 in)
2018	42.4 mm (1.7 in)
2019	66.6 mm (2.6 in)
2020	28.5 mm (1.1 in)
2021	32.0 mm (1.3 in)
2022	31.8 mm (1.3 in)
2023	73.2 mm (2.9 in)
2024	65.1 mm (2.6 in)
2025	57.2 mm (2.3 in)
2026	43.7 mm (1.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Hysham, 1945 to 2026. The record is 93 days in 1987, marked on the chart; the median year is 34 days.

Longest dry spell (CDD) at Hysham by year
Year	Longest dry spell (CDD)
1945	21 days
1946	41 days
1947	30 days
1948	85 days
1949	49 days
1950	26 days
1951	45 days
1952	66 days
1953	39 days
1954	66 days
1955	73 days
1956	75 days
1957	46 days
1958	29 days
1959	56 days
1960	50 days
1961	30 days
1962	30 days
1963	30 days
1964	39 days
1965	42 days
1966	35 days
1967	49 days
1968	22 days
1969	38 days
1970	30 days
1971	58 days
1972	26 days
1973	37 days
1974	36 days
1975	23 days
1976	54 days
1977	33 days
1978	33 days
1979	30 days
1980	27 days
1981	29 days
1982	19 days
1983	24 days
1984	29 days
1985	33 days
1986	32 days
1987	93 days
1988	38 days
1989	14 days
1990	31 days
1991	49 days
1992	53 days
1993	44 days
1994	40 days
1995	26 days
1996	39 days
1997	19 days
1998	33 days
1999	46 days
2000	47 days
2001	36 days
2002	33 days
2003	35 days
2004	34 days
2005	24 days
2006	41 days
2007	37 days
2008	23 days
2009	23 days
2010	29 days
2011	26 days
2012	44 days
2013	25 days
2014	53 days
2015	26 days
2016	22 days
2017	29 days
2018	23 days
2019	17 days
2020	20 days
2021	26 days
2022	20 days
2023	34 days
2024	39 days
2025	34 days
2026	39 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

69 years with a frost

Across 69 years with a frost, the median last spring frost at Hysham falls on 13 May and the median first autumn frost on 22 September, which leaves a median of 130 days between them.

In 1993 to 2025 the median growing season was 145 days. That is 20 days more than in 1946 to 1982.

Fitted over all years, the growing season changes by +4.1 days per decade at this station.

Frost dates and growing season at Hysham
Measure	Median, all years	Earliest period (1946 to 1982)	Recent period (1993 to 2025)	Recent against earliest	Fitted trend
Last spring frost	13 May	14 May	11 May	3 days earlier	-1.9 days per decade
First autumn frost	22 September	19 September	3 October	14 days later	+2.2 days per decade
Growing days	130 days	125 days	145 days	20 days more	+4.1 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

77 years, 1946 to 2025

A day with at least 31.7 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 82.0 mm (3.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Hysham: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	31.7 mm (1.2 in)
5 years	43.9 mm (1.7 in)
10 years	52.5 mm (2.1 in)
25 years	63.9 mm (2.5 in)
50 years	72.8 mm (2.9 in)
100 years	82.0 mm (3.2 in)	Longer than the 77 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, 77 years of values from 1946 to 2025.

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: 81.3 mm (3.2 in) in 2013; 77.5 mm (3.1 in) in 1961; 73.7 mm (2.9 in) in 2014.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Climate Twins

2008 to 2025 against 1961 to 1990

Over 2008 to 2025, Hysham had a mean temperature of 8.7 C (47.6 F) and 389.8 mm (15.3 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Oral (United States, 448 km away), Oelrichs (United States, 467 km away) and Chadron 3SW (United States, 509 km away).

Climate twins of Hysham: stations whose 1961 to 1990 climate is closest to its 2008 to 2025 climate
Twin station	Country	Distance away	Mean temperature, 1961-1990	Rain a year, 1961-1990	Climate difference
Oral	United States	448 km (278 mi)	8.8 C (47.8 F)	390.2 mm (15.4 in)	0.83
Oelrichs	United States	467 km (290 mi)	8.9 C (48.1 F)	428.1 mm (16.9 in)	0.99
Chadron 3SW	United States	509 km (316 mi)	8.7 C (47.6 F)	377.4 mm (14.9 in)	1.00

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 Hysham standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Hysham 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.

Data as of 2026-10-14. Last revised 14 October 2026 (2026-10-14).