Daily records
Page built 2026-10-16
Data as of 2026-10-14
Search
Built 2026-10-16 (16 October 2026)

Hysham 25 SSE Weather Records (USC00244364)

Record envelope, standing records and threshold days for Hysham 25 SSE (USC00244364), Montana, United States, with 76 years of record.

Key Facts for Hysham 25 SSE

  • Hysham 25 SSE (USC00244364) is a weather station in Montana, United States at 45.94 latitude and -107.14 longitude, 945 m (3,100 ft) above sea level.
  • The station reports from 1951 to 2026, 76 years of record.
  • 1,464 records set at Hysham 25 SSE still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Hysham 25 SSE set a daily record precipitation of 6.4 mm (0.25 in) on 11 October 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, 45.94 latitude, -107.14 longitude.
  • Elevation: 945 m (3,100 ft).
  • Period of record: 1951 to 2026, 76 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

18 days at or beyond a record
Daily record high and record low at Hysham 25 SSE, with 2026 drawn through them The band shows the record high and record low for each calendar day at Hysham 25 SSE. The lines show the 2026 daily maximum and minimum. 18 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -60-40-200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Hysham 25 SSE. The lines show the 2026 daily maximum and minimum. 18 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Hysham 25 SSE, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan18.3 C (64.9 F)-43.9 C (-47.0 F)16.7 C (62.1 F)-26.1 C (-15.0 F)
Feb21.7 C (71.1 F)-42.8 C (-45.0 F)20.6 C (69.1 F)-24.4 C (-11.9 F)
Mar28.3 C (82.9 F)-38.9 C (-38.0 F)27.8 C (82.0 F)-18.3 C (-0.9 F)
Apr31.7 C (89.1 F)-22.2 C (-8.0 F)27.2 C (81.0 F)-7.8 C (18.0 F)
May37.2 C (99.0 F)-12.2 C (10.0 F)34.4 C (93.9 F)-9.4 C (15.1 F)
Jun41.7 C (107.1 F)-2.8 C (27.0 F)31.1 C (88.0 F)0.6 C (33.1 F)
Jul45.0 C (113.0 F)-0.6 C (30.9 F)43.3 C (109.9 F)6.1 C (43.0 F)
Aug42.8 C (109.0 F)-2.8 C (27.0 F)41.1 C (106.0 F)1.7 C (35.1 F)
Sep40.0 C (104.0 F)-8.9 C (16.0 F)36.1 C (97.0 F)1.1 C (34.0 F)
Oct35.0 C (95.0 F)-26.1 C (-15.0 F)30.0 C (86.0 F)-1.1 C (30.0 F)
Nov27.2 C (81.0 F)-36.7 C (-34.1 F)n/an/a
Dec20.0 C (68.0 F)-45.6 C (-50.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Hysham 25 SSE by the year they were set 1,464 records at Hysham 25 SSE still stand. 1988 holds the most, with 46. 02040601959: 191960: 291961: 271962: 321963: 241964: 251965: 251966: 231967: 171968: 61969: 151970: 41971: 11972: 191973: 221974: 231975: 191976: 161977: 101978: 231979: 151980: 291981: 121982: 221983: 311984: 301985: 401986: 241987: 311988: 461989: 221990: 241991: 241992: 371993: 231994: 141995: 361996: 341997: 261998: 181999: 192000: 212001: 142002: 392003: 292004: 152005: 192006: 102007: 202008: 282009: 232010: 62011: 122012: 192013: 242014: 232015: 192016: 112017: 182018: 132019: 192020: 202021: 232022: 262023: 172024: 132025: 242026: 231959196619731980198719942001200820152022
1,464 records at Hysham 25 SSE still stand. 1988 holds the most, with 46.
Standing records at Hysham 25 SSE by the year they were set
Year setStanding records
195919
196029
196127
196232
196324
196425
196525
196623
196717
19686
196915
19704
19711
197219
197322
197423
197519
197616
197710
197823
197915
198029
198112
198222
198331
198430
198540
198624
198731
198846
198922
199024
199124
199237
199323
199414
199536
199634
199726
199818
199919
200021
200114
200239
200329
200415
200519
200610
200720
200828
200923
20106
201112
201219
201324
201423
201519
201611
201718
201813
201919
202020
202123
202226
202317
202413
202524
202623

All-Time Record Progression

3 new records
When Hysham 25 SSE set new all-time records 3 all-time records were set at Hysham 25 SSE between 15 July 2002 and 14 September 2013. Each dot is a new record. Record high maximum temperatureRecord high minimum temperatureRecord daily precipitation15 July 2002: Record high maximum temperature 45.0 C (113.0 F)19 July 2007: Record high minimum temperature 25.0 C (77.0 F)14 September 2013: Record daily precipitation 63.0 mm (2.5 in)20052010
3 all-time records were set at Hysham 25 SSE between 15 July 2002 and 14 September 2013. Each dot is a new record.
When Hysham 25 SSE set new all-time records
DateKindDetail
2002-07-15Record high maximum temperatureRecord high maximum temperature 45.0 C (113.0 F)
2007-07-19Record high minimum temperatureRecord high minimum temperature 25.0 C (77.0 F)
2013-09-14Record daily precipitationRecord daily precipitation 63.0 mm (2.5 in)

Wettest Day of Each Month

Sep: 63.0 mm (2.5 in)
Record daily precipitation for each month at Hysham 25 SSE The wettest day on record for each calendar month at Hysham 25 SSE. The most was 63.0 mm (2.5 in) on 14 September 2013. 020406080 Jan: 25.4 mm (1.0 in), 31 January 2007 Jan Feb: 17.8 mm (0.7 in), 23 February 1974 Feb Mar: 21.8 mm (0.9 in), 29 March 2007 Mar Apr: 59.2 mm (2.3 in), 26 April 1969 Apr May: 62.7 mm (2.5 in), 29 May 2018 May Jun: 57.2 mm (2.3 in), 5 June 2001 Jun Jul: 45.5 mm (1.8 in), 3 July 1974 Jul Aug: 48.8 mm (1.9 in), 19 August 1964 Aug Sep: 63.0 mm (2.5 in), 14 September 2013 Sep Oct: 48.0 mm (1.9 in), 8 October 1993 Oct Nov: 27.2 mm (1.1 in), 26 November 1999 Nov Dec: 18.3 mm (0.7 in), 23 December 1984 Dec
The wettest day on record for each calendar month at Hysham 25 SSE. The most was 63.0 mm (2.5 in) on 14 September 2013.
Record daily precipitation for each month at Hysham 25 SSE
MonthRecord daily precipitation (mm)Date
Jan25.4 mm (1.0 in)31 January 2007
Feb17.8 mm (0.7 in)23 February 1974
Mar21.8 mm (0.9 in)29 March 2007
Apr59.2 mm (2.3 in)26 April 1969
May62.7 mm (2.5 in)29 May 2018
Jun57.2 mm (2.3 in)5 June 2001
Jul45.5 mm (1.8 in)3 July 1974
Aug48.8 mm (1.9 in)19 August 1964
Sep63.0 mm (2.5 in)14 September 2013
Oct48.0 mm (1.9 in)8 October 1993
Nov27.2 mm (1.1 in)26 November 1999
Dec18.3 mm (0.7 in)23 December 1984

Period of Record Coverage

1951 to 2026
Days with data per year at Hysham 25 SSE 69 years of record at Hysham 25 SSE, 1951 to 2026. 19 years have data for under 90 percent of days and are left out of rankings: 1951, 1959, 1964, 1965, 1966, 1967, 1968, 1969 and others. 1951: 1 of 365 days1959: 181 of 365 days1960: 363 of 366 days1961: 342 of 365 days1962: 360 of 365 days1963: 353 of 365 days1964: 326 of 366 days1965: 269 of 365 days1966: 314 of 365 days1967: 262 of 365 days1968: 178 of 366 days1969: 242 of 365 days1970: 219 of 365 days1971: 167 of 365 days1972: 151 of 366 days1973: 359 of 365 days1974: 358 of 365 days1975: 358 of 365 days1976: 359 of 366 days1977: 357 of 365 days1978: 359 of 365 days1979: 356 of 365 days1980: 356 of 366 days1981: 357 of 365 days1982: 362 of 365 days1983: 361 of 365 days1984: 360 of 366 days1985: 363 of 365 days1986: 362 of 365 days1987: 363 of 365 days1988: 366 of 366 days1989: 359 of 365 days1990: 333 of 365 days1991: 362 of 365 days1992: 366 of 366 days1993: 363 of 365 days1994: 364 of 365 days1995: 361 of 365 days1996: 363 of 366 days1997: 364 of 365 days1998: 361 of 365 days1999: 365 of 365 days2000: 365 of 366 days2001: 363 of 365 days2002: 363 of 365 days2003: 359 of 365 days2004: 364 of 366 days2005: 289 of 365 days2006: 309 of 365 days2007: 358 of 365 days2008: 353 of 366 days2009: 310 of 365 days2010: 170 of 365 days2011: 312 of 365 days2012: 358 of 366 days2013: 363 of 365 days2014: 362 of 365 days2015: 357 of 365 days2016: 364 of 366 days2017: 362 of 365 days2018: 352 of 365 days2019: 364 of 365 days2020: 290 of 366 days2021: 281 of 365 days2022: 361 of 365 days2023: 362 of 365 days2024: 365 of 366 days2025: 359 of 365 days2026: 279 of 365 days1960197019801990200020102020
69 years of record at Hysham 25 SSE, 1951 to 2026. 19 years have data for under 90 percent of days and are left out of rankings: 1951, 1959, 1964, 1965, 1966, 1967, 1968, 1969 and others.
Days with data per year at Hysham 25 SSE
YearDays with dataShare of yearComplete
195110%No
195918150%No
196036399%Yes
196134294%Yes
196236099%Yes
196335397%Yes
196432689%No
196526974%No
196631486%No
196726272%No
196817849%No
196924266%No
197021960%No
197116746%No
197215141%No
197335998%Yes
197435898%Yes
197535898%Yes
197635998%Yes
197735798%Yes
197835998%Yes
197935698%Yes
198035697%Yes
198135798%Yes
198236299%Yes
198336199%Yes
198436098%Yes
198536399%Yes
198636299%Yes
198736399%Yes
1988366100%Yes
198935998%Yes
199033391%Yes
199136299%Yes
1992366100%Yes
199336399%Yes
1994364100%Yes
199536199%Yes
199636399%Yes
1997364100%Yes
199836199%Yes
1999365100%Yes
2000365100%Yes
200136399%Yes
200236399%Yes
200335998%Yes
200436499%Yes
200528979%No
200630985%No
200735898%Yes
200835396%Yes
200931085%No
201017047%No
201131285%No
201235898%Yes
201336399%Yes
201436299%Yes
201535798%Yes
201636499%Yes
201736299%Yes
201835296%Yes
2019364100%Yes
202029079%No
202128177%No
202236199%Yes
202336299%Yes
2024365100%Yes
202535998%Yes
202627976%No

Latest Records

20
Latest records at Hysham 25 SSE
DateStationRecordValueBeat old record byOld record stoodSignificance
11 October 2026Hysham 25 SSE, USdaily rain (Provisional)6.4 mm (0.25 in)1.1 mm (0.04 in)24 years15 of 100 (Routine)
25 September 2026Hysham 25 SSE, USdaily high min (Provisional)12.2 C (54.0 F)2.2 C (4.0 F)59 years28 of 100 (Routine)
21 September 2026Hysham 25 SSE, USdaily high min (Provisional)11.7 C (53.1 F)1.1 C (2.0 F)48 years23 of 100 (Routine)
21 September 2026Hysham 25 SSE, USdaily rain (Provisional)19.8 mm (0.8 in)8.1 mm (0.32 in)21 years20 of 100 (Routine)
20 September 2026Hysham 25 SSE, USdaily rain (Provisional)49.3 mm (1.9 in)39.4 mm (1.6 in)8 years49 of 100 (Notable)
20 September 2026Hysham 25 SSE, USdaily high min (Tie, Provisional)12.8 C (55.0 F)tie41 years4 of 100 (Routine)
22 August 2026Hysham 25 SSE, USdaily high min (Tie, Provisional)15.6 C (60.1 F)tie44 years5 of 100 (Routine)
14 August 2026Hysham 25 SSE, USdaily rain33.0 mm (1.3 in)24.9 mm (1.0 in)28 years54 of 100 (Notable)
4 August 2026Hysham 25 SSE, USdaily low min1.7 C (35.1 F)1.1 C (2.0 F)48 years23 of 100 (Routine)
4 August 2026Hysham 25 SSE, USdaily low max19.4 C (66.9 F)1.2 C (2.2 F)13 years13 of 100 (Routine)
2 August 2026Hysham 25 SSE, USdaily high max41.1 C (106.0 F)0.5 C (0.9 F)17 years12 of 100 (Routine)
30 July 2026Hysham 25 SSE, USdaily high min22.2 C (72.0 F)3.9 C (7.0 F)39 years28 of 100 (Routine)
13 July 2026Hysham 25 SSE, USdaily high max43.3 C (109.9 F)1.6 C (2.9 F)24 years17 of 100 (Routine)
12 July 2026Hysham 25 SSE, USdaily high max38.9 C (102.0 F)1.7 C (3.1 F)12 years13 of 100 (Routine)
28 June 2026Hysham 25 SSE, USdaily rain9.1 mm (0.36 in)1.5 mm (0.06 in)44 years20 of 100 (Routine)
1 June 2026Hysham 25 SSE, USdaily rain22.9 mm (0.9 in)8.2 mm (0.32 in)12 years20 of 100 (Routine)
31 May 2026Hysham 25 SSE, USdaily high min12.8 C (55.0 F)1.1 C (2.0 F)44 years22 of 100 (Routine)
27 May 2026Hysham 25 SSE, USdaily high min14.4 C (57.9 F)1.1 C (2.0 F)59 years26 of 100 (Routine)
26 May 2026Hysham 25 SSE, USdaily high max31.1 C (88.0 F)1.1 C (2.0 F)43 years20 of 100 (Routine)
25 May 2026Hysham 25 SSE, USdaily high min13.9 C (57.0 F)1.7 C (3.1 F)63 years28 of 100 (Routine)

Climate Trend

48 complete years, 1960 to 2025
Annual mean temperature at Hysham 25 SSE as warming stripes, 1960 to 2025 One stripe for each of 48 complete years at Hysham 25 SSE, 1960 to 2025. Blue stripes are years cooler than the station's own mean of 7.1 C (44.7 F); red stripes are warmer. The coolest year was 1978, at 4.8 C (40.6 F), and the warmest was 1999, at 8.9 C (48.0 F). The strongest colour marks a difference of 2.3 C (4.1 F). 1960: 7.7 C, +0.6 C from the station mean1962: 7.4 C, +0.3 C from the station mean1963: 7.9 C, +0.8 C from the station mean1973: 6.5 C, -0.6 C from the station mean1974: 7.0 C, 0.0 C from the station mean1975: 5.3 C, -1.7 C from the station mean1976: 7.4 C, +0.3 C from the station mean1977: 6.7 C, -0.3 C from the station mean1978: 4.8 C, -2.3 C from the station mean1979: 5.6 C, -1.4 C from the station mean1980: 7.3 C, +0.2 C from the station mean1981: 8.0 C, +0.9 C from the station mean1982: 5.3 C, -1.8 C from the station mean1983: 7.0 C, -0.1 C from the station mean1984: 6.6 C, -0.5 C from the station mean1985: 5.0 C, -2.1 C from the station mean1986: 8.0 C, +0.9 C from the station mean1987: 8.5 C, +1.4 C from the station mean1988: 8.6 C, +1.5 C from the station mean1989: 6.2 C, -0.9 C from the station mean1991: 7.6 C, +0.5 C from the station mean1992: 7.6 C, +0.5 C from the station mean1993: 5.3 C, -1.7 C from the station mean1994: 7.5 C, +0.4 C from the station mean1995: 7.2 C, +0.1 C from the station mean1996: 5.4 C, -1.7 C from the station mean1997: 7.2 C, +0.2 C from the station mean1998: 8.5 C, +1.5 C from the station mean1999: 8.9 C, +1.8 C from the station mean2000: 7.3 C, +0.2 C from the station mean2001: 8.0 C, +0.9 C from the station mean2002: 7.0 C, -0.1 C from the station mean2003: 7.8 C, +0.8 C from the station mean2004: 7.5 C, +0.4 C from the station mean2007: 8.0 C, +0.9 C from the station mean2008: 5.9 C, -1.2 C from the station mean2012: 8.7 C, +1.6 C from the station mean2013: 7.1 C, +0.1 C from the station mean2014: 6.7 C, -0.4 C from the station mean2015: 8.1 C, +1.0 C from the station mean2016: 8.3 C, +1.2 C from the station mean2017: 7.3 C, +0.3 C from the station mean2018: 5.5 C, -1.5 C from the station mean2019: 5.2 C, -1.8 C from the station mean2022: 6.3 C, -0.8 C from the station mean2023: 7.4 C, +0.3 C from the station mean2024: 7.9 C, +0.8 C from the station mean2025: 7.4 C, +0.3 C from the station mean1960197019801990200020102020
One stripe for each of 48 complete years at Hysham 25 SSE, 1960 to 2025. Blue stripes are years cooler than the station's own mean of 7.1 C (44.7 F); red stripes are warmer. The coolest year was 1978, at 4.8 C (40.6 F), and the warmest was 1999, at 8.9 C (48.0 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Hysham 25 SSE as warming stripes, 1960 to 2025
YearAnnual mean temperatureDifference from the station mean
19607.7 C+0.61 C
19627.4 C+0.35 C
19637.9 C+0.80 C
19736.5 C-0.57 C
19747.0 C-0.03 C
19755.3 C-1.73 C
19767.4 C+0.33 C
19776.7 C-0.33 C
19784.8 C-2.27 C
19795.6 C-1.43 C
19807.3 C+0.21 C
19818.0 C+0.95 C
19825.3 C-1.76 C
19837.0 C-0.07 C
19846.6 C-0.48 C
19855.0 C-2.07 C
19868.0 C+0.92 C
19878.5 C+1.43 C
19888.6 C+1.50 C
19896.2 C-0.88 C
19917.6 C+0.52 C
19927.6 C+0.53 C
19935.3 C-1.73 C
19947.5 C+0.44 C
19957.2 C+0.08 C
19965.4 C-1.72 C
19977.2 C+0.17 C
19988.5 C+1.47 C
19998.9 C+1.80 C
20007.3 C+0.20 C
20018.0 C+0.93 C
20027.0 C-0.11 C
20037.8 C+0.76 C
20047.5 C+0.40 C
20078.0 C+0.91 C
20085.9 C-1.19 C
20128.7 C+1.58 C
20137.1 C+0.06 C
20146.7 C-0.38 C
20158.1 C+1.00 C
20168.3 C+1.20 C
20177.3 C+0.26 C
20185.5 C-1.53 C
20195.2 C-1.84 C
20226.3 C-0.78 C
20237.4 C+0.35 C
20247.9 C+0.85 C
20257.4 C+0.32 C

The fitted trend in annual mean temperature here over 1960 to 2025 is 0.1 C (-0.1 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.2 to 0.4) per decade. The slope is a straight line fitted to 48 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Hysham 25 SSE
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.1 C (-0.1 to 0.2) per decade0.1 F (-0.2 to 0.4) per decade1960 to 202548Not clearly different from zero
Mean daily maximum-0.03 C (-0.25 to 0.19) per decade-0.1 F (-0.5 to 0.3) per decade1960 to 202548Not clearly different from zero
Mean daily minimum0.16 C (0.01 to 0.32) per decade0.30 F (0.01 to 0.58) per decade1960 to 202548Rise

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

1951 to 2026
Yearly extremes at Hysham 25 SSE: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)45.0 C (113.0 F)200239.4 C (102.9 F)69
Coldest night (TNn)-45.6 C (-50.1 F)1989-34.4 C (-29.9 F)69
Wettest day (Rx1day)63.0 mm (2.5 in)201327.7 mm (1.1 in)69
Wettest five days (Rx5day)119.1 mm (4.7 in)201146.1 mm (1.8 in)68
Longest dry spell (CDD)79 days196331 days68

Hottest day (TXx)

Hottest day (TXx) at Hysham 25 SSE by year The hottest day of the year at Hysham 25 SSE, 1951 to 2026. The record is 45.0 C (113.0 F) in 2002, marked on the chart; the median year is 39.4 C (102.9 F). 02040601960198020002020Record: 45.0 C (113.0 F) in 2002
The hottest day of the year at Hysham 25 SSE, 1951 to 2026. The record is 45.0 C (113.0 F) in 2002, marked on the chart; the median year is 39.4 C (102.9 F).
Hottest day (TXx) at Hysham 25 SSE by year
YearHottest day (TXx)
19510.0 C (32.0 F)
195942.8 C (109.0 F)
196042.8 C (109.0 F)
196142.8 C (109.0 F)
196239.4 C (102.9 F)
196338.3 C (100.9 F)
196441.1 C (106.0 F)
196540.6 C (105.1 F)
196642.8 C (109.0 F)
196736.1 C (97.0 F)
196836.1 C (97.0 F)
196935.0 C (95.0 F)
197031.1 C (88.0 F)
197137.8 C (100.0 F)
197231.7 C (89.1 F)
197339.4 C (102.9 F)
197438.3 C (100.9 F)
197540.0 C (104.0 F)
197641.1 C (106.0 F)
197738.9 C (102.0 F)
197839.4 C (102.9 F)
197938.9 C (102.0 F)
198040.0 C (104.0 F)
198138.9 C (102.0 F)
198240.0 C (104.0 F)
198341.7 C (107.1 F)
198438.3 C (100.9 F)
198539.4 C (102.9 F)
198637.8 C (100.0 F)
198738.3 C (100.9 F)
198841.7 C (107.1 F)
198941.7 C (107.1 F)
199040.0 C (104.0 F)
199138.9 C (102.0 F)
199237.8 C (100.0 F)
199333.9 C (93.0 F)
199437.8 C (100.0 F)
199542.2 C (108.0 F)
199639.4 C (102.9 F)
199738.3 C (100.9 F)
199839.4 C (102.9 F)
199941.1 C (106.0 F)
200040.6 C (105.1 F)
200141.1 C (106.0 F)
200245.0 C (113.0 F)
200341.1 C (106.0 F)
200440.6 C (105.1 F)
200541.1 C (106.0 F)
200639.4 C (102.9 F)
200743.3 C (109.9 F)
200840.6 C (105.1 F)
200937.2 C (99.0 F)
201038.9 C (102.0 F)
201137.2 C (99.0 F)
201241.1 C (106.0 F)
201337.2 C (99.0 F)
201438.9 C (102.0 F)
201540.0 C (104.0 F)
201639.4 C (102.9 F)
201738.9 C (102.0 F)
201838.9 C (102.0 F)
201936.7 C (98.1 F)
202039.4 C (102.9 F)
202141.1 C (106.0 F)
202240.0 C (104.0 F)
202338.9 C (102.0 F)
202440.6 C (105.1 F)
202538.9 C (102.0 F)
202643.3 C (109.9 F)

Coldest night (TNn)

Coldest night (TNn) at Hysham 25 SSE by year The coldest night of the year at Hysham 25 SSE, 1951 to 2026. The record is -45.6 C (-50.1 F) in 1989, marked on the chart; the median year is -34.4 C (-29.9 F). -50-40-30-20-101960198020002020Record: -45.6 C (-50.1 F) in 1989
The coldest night of the year at Hysham 25 SSE, 1951 to 2026. The record is -45.6 C (-50.1 F) in 1989, marked on the chart; the median year is -34.4 C (-29.9 F).
Coldest night (TNn) at Hysham 25 SSE by year
YearColdest night (TNn)
1951-16.7 C (1.9 F)
1959-36.7 C (-34.1 F)
1960-35.0 C (-31.0 F)
1961-30.6 C (-23.1 F)
1962-36.7 C (-34.1 F)
1963-41.7 C (-43.1 F)
1964-37.8 C (-36.0 F)
1965-32.2 C (-26.0 F)
1966-33.9 C (-29.0 F)
1967-35.0 C (-31.0 F)
1968-32.8 C (-27.0 F)
1969-41.1 C (-42.0 F)
1970-37.2 C (-35.0 F)
1971-33.9 C (-29.0 F)
1972-37.2 C (-35.0 F)
1973-34.4 C (-29.9 F)
1974-35.0 C (-31.0 F)
1975-31.1 C (-24.0 F)
1976-33.3 C (-27.9 F)
1977-34.4 C (-29.9 F)
1978-35.6 C (-32.1 F)
1979-34.4 C (-29.9 F)
1980-34.4 C (-29.9 F)
1981-36.1 C (-33.0 F)
1982-40.0 C (-40.0 F)
1983-43.9 C (-47.0 F)
1984-31.7 C (-25.1 F)
1985-39.4 C (-38.9 F)
1986-35.0 C (-31.0 F)
1987-23.9 C (-11.0 F)
1988-32.8 C (-27.0 F)
1989-45.6 C (-50.1 F)
1990-39.4 C (-38.9 F)
1991-35.6 C (-32.1 F)
1992-32.8 C (-27.0 F)
1993-33.9 C (-29.0 F)
1994-33.3 C (-27.9 F)
1995-35.6 C (-32.1 F)
1996-42.8 C (-45.0 F)
1997-42.8 C (-45.0 F)
1998-36.7 C (-34.1 F)
1999-22.8 C (-9.0 F)
2000-30.6 C (-23.1 F)
2001-28.3 C (-18.9 F)
2002-29.4 C (-20.9 F)
2003-33.9 C (-29.0 F)
2004-36.1 C (-33.0 F)
2005-32.2 C (-26.0 F)
2006-31.1 C (-24.0 F)
2007-31.1 C (-24.0 F)
2008-36.1 C (-33.0 F)
2009-35.0 C (-31.0 F)
2010-31.7 C (-25.1 F)
2011-33.9 C (-29.0 F)
2012-27.2 C (-17.0 F)
2013-37.2 C (-35.0 F)
2014-36.7 C (-34.1 F)
2015-31.1 C (-24.0 F)
2016-33.9 C (-29.0 F)
2017-31.1 C (-24.0 F)
2018-34.4 C (-29.9 F)
2019-38.9 C (-38.0 F)
2020-25.6 C (-14.1 F)
2021-35.0 C (-31.0 F)
2022-37.8 C (-36.0 F)
2023-33.9 C (-29.0 F)
2024-43.9 C (-47.0 F)
2025-38.3 C (-36.9 F)
2026-26.1 C (-15.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Hysham 25 SSE by year The wettest day of the year at Hysham 25 SSE, 1951 to 2026. The record is 63.0 mm (2.5 in) in 2013, marked on the chart; the median year is 27.7 mm (1.1 in). 0204060801960198020002020Record: 63.0 mm (2.5 in) in 2013
The wettest day of the year at Hysham 25 SSE, 1951 to 2026. The record is 63.0 mm (2.5 in) in 2013, marked on the chart; the median year is 27.7 mm (1.1 in).
Wettest day (Rx1day) at Hysham 25 SSE by year
YearWettest day (Rx1day)
19514.3 mm (0.17 in)
195927.4 mm (1.1 in)
196020.6 mm (0.8 in)
196137.8 mm (1.5 in)
196236.1 mm (1.4 in)
196341.1 mm (1.6 in)
196448.8 mm (1.9 in)
196521.1 mm (0.8 in)
196631.5 mm (1.2 in)
196727.9 mm (1.1 in)
196825.9 mm (1.0 in)
196959.2 mm (2.3 in)
197033.8 mm (1.3 in)
197116.3 mm (0.6 in)
197212.7 mm (0.5 in)
197338.6 mm (1.5 in)
197448.5 mm (1.9 in)
197519.1 mm (0.8 in)
197626.9 mm (1.1 in)
197722.1 mm (0.9 in)
197845.0 mm (1.8 in)
197937.8 mm (1.5 in)
198025.7 mm (1.0 in)
198123.6 mm (0.9 in)
198228.2 mm (1.1 in)
198325.4 mm (1.0 in)
198418.3 mm (0.7 in)
198524.1 mm (0.9 in)
198641.4 mm (1.6 in)
198730.0 mm (1.2 in)
198826.2 mm (1.0 in)
198920.1 mm (0.8 in)
199017.8 mm (0.7 in)
199143.4 mm (1.7 in)
199217.3 mm (0.7 in)
199352.1 mm (2.1 in)
199427.7 mm (1.1 in)
199528.4 mm (1.1 in)
199622.9 mm (0.9 in)
199739.9 mm (1.6 in)
199827.9 mm (1.1 in)
199927.2 mm (1.1 in)
200023.6 mm (0.9 in)
200157.2 mm (2.3 in)
200220.6 mm (0.8 in)
200319.3 mm (0.8 in)
200424.1 mm (0.9 in)
200540.6 mm (1.6 in)
200621.6 mm (0.9 in)
200739.4 mm (1.6 in)
200821.1 mm (0.8 in)
200919.8 mm (0.8 in)
201018.3 mm (0.7 in)
201146.2 mm (1.8 in)
201227.7 mm (1.1 in)
201363.0 mm (2.5 in)
201443.7 mm (1.7 in)
201524.4 mm (1.0 in)
201652.6 mm (2.1 in)
201718.5 mm (0.7 in)
201862.7 mm (2.5 in)
201934.0 mm (1.3 in)
202018.0 mm (0.7 in)
202119.3 mm (0.8 in)
202224.4 mm (1.0 in)
202356.4 mm (2.2 in)
202447.2 mm (1.9 in)
202527.9 mm (1.1 in)
202649.3 mm (1.9 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Hysham 25 SSE by year The wettest five days of the year at Hysham 25 SSE, 1951 to 2026. The record is 119.1 mm (4.7 in) in 2011, marked on the chart; the median year is 46.1 mm (1.8 in). 0501001501960198020002020Record: 119.1 mm (4.7 in) in 2011
The wettest five days of the year at Hysham 25 SSE, 1951 to 2026. The record is 119.1 mm (4.7 in) in 2011, marked on the chart; the median year is 46.1 mm (1.8 in).
Wettest five days (Rx5day) at Hysham 25 SSE by year
YearWettest five days (Rx5day)
1951n/a
195929.7 mm (1.2 in)
196022.3 mm (0.9 in)
196157.9 mm (2.3 in)
196239.9 mm (1.6 in)
196359.2 mm (2.3 in)
196457.9 mm (2.3 in)
196545.9 mm (1.8 in)
196660.4 mm (2.4 in)
196768.4 mm (2.7 in)
196857.6 mm (2.3 in)
1969100.6 mm (4.0 in)
197093.1 mm (3.7 in)
197120.9 mm (0.8 in)
197216.5 mm (0.6 in)
197357.7 mm (2.3 in)
197469.0 mm (2.7 in)
197530.2 mm (1.2 in)
197651.0 mm (2.0 in)
197765.5 mm (2.6 in)
197897.1 mm (3.8 in)
197938.3 mm (1.5 in)
198036.5 mm (1.4 in)
198155.9 mm (2.2 in)
198263.8 mm (2.5 in)
198334.2 mm (1.3 in)
198431.0 mm (1.2 in)
198543.6 mm (1.7 in)
198673.9 mm (2.9 in)
198735.6 mm (1.4 in)
198836.6 mm (1.4 in)
198941.9 mm (1.6 in)
199026.9 mm (1.1 in)
199179.4 mm (3.1 in)
199230.3 mm (1.2 in)
199377.5 mm (3.1 in)
199444.0 mm (1.7 in)
199546.2 mm (1.8 in)
199638.7 mm (1.5 in)
199741.5 mm (1.6 in)
199846.9 mm (1.8 in)
199930.1 mm (1.2 in)
200028.8 mm (1.1 in)
200170.1 mm (2.8 in)
200228.3 mm (1.1 in)
200332.2 mm (1.3 in)
200433.2 mm (1.3 in)
200550.3 mm (2.0 in)
200647.1 mm (1.9 in)
200772.9 mm (2.9 in)
200868.0 mm (2.7 in)
200925.4 mm (1.0 in)
201040.7 mm (1.6 in)
2011119.1 mm (4.7 in)
201247.5 mm (1.9 in)
2013111.7 mm (4.4 in)
201461.0 mm (2.4 in)
201530.7 mm (1.2 in)
201682.5 mm (3.2 in)
201734.8 mm (1.4 in)
2018102.3 mm (4.0 in)
201940.4 mm (1.6 in)
202027.1 mm (1.1 in)
202137.8 mm (1.5 in)
202240.7 mm (1.6 in)
202379.0 mm (3.1 in)
202495.0 mm (3.7 in)
202542.7 mm (1.7 in)
202669.1 mm (2.7 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Hysham 25 SSE by year The longest dry spell of the year at Hysham 25 SSE, 1951 to 2026. The record is 79 days in 1963, marked on the chart; the median year is 31 days. 0204060801960198020002020Record: 79 days in 1963
The longest dry spell of the year at Hysham 25 SSE, 1951 to 2026. The record is 79 days in 1963, marked on the chart; the median year is 31 days.
Longest dry spell (CDD) at Hysham 25 SSE by year
YearLongest dry spell (CDD)
1951n/a
195936 days
196038 days
196144 days
196227 days
196379 days
196432 days
196532 days
196642 days
196738 days
196821 days
196956 days
197021 days
197117 days
197233 days
197326 days
197430 days
197519 days
197626 days
197723 days
197820 days
197935 days
198023 days
198132 days
198220 days
198344 days
198424 days
198522 days
198625 days
198744 days
198837 days
198921 days
199038 days
199138 days
199253 days
199325 days
199433 days
199524 days
199631 days
199719 days
199835 days
199945 days
200036 days
200131 days
200231 days
200348 days
200427 days
200523 days
200630 days
200732 days
200823 days
200930 days
201017 days
201128 days
201228 days
201323 days
201424 days
201539 days
201622 days
201740 days
201823 days
201922 days
202032 days
202135 days
202232 days
202334 days
202428 days
202526 days
202640 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

48 years with a frost

Across 48 years with a frost, the median last spring frost at Hysham 25 SSE falls on 26 May and the median first autumn frost on 12 September, which leaves a median of 107 days between them.

Fitted over all years, the growing season changes by +1.6 days per decade at this station.

Frost dates and growing season at Hysham 25 SSE
MeasureMedian, all yearsEarliest periodRecent period (1988 to 2025)Recent against earliestFitted trend
Last spring frost26 Mayn/a26 Mayn/a+1.0 days per decade
First autumn frost12 Septembern/a13 Septembern/a+2.6 days per decade
Growing days107 daysn/a107 daysn/a+1.6 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

53 years, 1960 to 2025

A day with at least 29.5 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 79.5 mm (3.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Hysham 25 SSE: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years29.5 mm (1.2 in)
5 years41.1 mm (1.6 in)
10 years49.4 mm (1.9 in)
25 years60.8 mm (2.4 in)
50 years69.9 mm (2.8 in)
100 years79.5 mm (3.1 in)Longer than the 53 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, 53 years of values from 1960 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: 63.0 mm (2.5 in) in 2013; 62.7 mm (2.5 in) in 2018; 57.2 mm (2.3 in) in 2001.

Station Changes

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

Climate Twins

2004 to 2025 against 1961 to 1990

Over 2004 to 2025, Hysham 25 SSE had a mean temperature of 7.2 C (44.9 F) and 408.5 mm (16.1 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Gillette 3SE (United States, 228 km away), Moorcroft 3S (United States, 258 km away) and Biddle 8 SW (United States, 163 km away).

Climate twins of Hysham 25 SSE: stations whose 1961 to 1990 climate is closest to its 2004 to 2025 climate
Twin stationCountryDistance awayMean temperature, 1961-1990Rain a year, 1961-1990Climate difference
Gillette 3SEUnited States228 km (142 mi)7.2 C (45.0 F)421.5 mm (16.6 in)0.80
Moorcroft 3SUnited States258 km (160 mi)6.8 C (44.3 F)311.8 mm (12.3 in)0.86
Biddle 8 SWUnited States163 km (101 mi)7.4 C (45.2 F)342.3 mm (13.5 in)0.88

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 25 SSE standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Hysham 25 SSE 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 . Last revised (2026-10-14).