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Black Mtn Weather Records (USC00480778)

Record envelope, standing records and threshold days for Black Mtn (USC00480778), Wyoming, United States, with 64 years of record.

Key Facts for Black Mtn

  • Black Mtn (USC00480778) is a weather station in Wyoming, United States at 43.66 latitude and -107.74 longitude, 1,718 m (5,635 ft) above sea level.
  • The station reports from 1963 to 2026, 64 years of record.
  • 1,464 records set at Black Mtn still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Black Mtn set a daily record high maximum temperature of 27.8 C (82.0 F) on 9 October 2026 (provisional).

Provisional Records

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

About the Station

  • Location: Wyoming, United States, 43.66 latitude, -107.74 longitude.
  • Elevation: 1,718 m (5,635 ft).
  • Period of record: 1963 to 2026, 64 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

27 days at or beyond a record
Daily record high and record low at Black Mtn, with 2026 drawn through them The band shows the record high and record low for each calendar day at Black Mtn. The lines show the 2026 daily maximum and minimum. 27 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-2002040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Black Mtn. The lines show the 2026 daily maximum and minimum. 27 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Black Mtn, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan15.6 C (60.1 F)-35.0 C (-31.0 F)12.2 C (54.0 F)-20.0 C (-4.0 F)
Feb18.3 C (64.9 F)-37.8 C (-36.0 F)16.1 C (61.0 F)-18.3 C (-0.9 F)
Mar25.0 C (77.0 F)-25.6 C (-14.1 F)25.0 C (77.0 F)-13.3 C (8.1 F)
Apr28.9 C (84.0 F)-16.1 C (3.0 F)25.0 C (77.0 F)-11.1 C (12.0 F)
May33.9 C (93.0 F)-8.9 C (16.0 F)31.1 C (88.0 F)-2.8 C (27.0 F)
Jun38.9 C (102.0 F)-4.4 C (24.1 F)33.3 C (91.9 F)-3.3 C (26.1 F)
Jul40.0 C (104.0 F)2.8 C (37.0 F)40.0 C (104.0 F)7.2 C (45.0 F)
Aug38.9 C (102.0 F)1.7 C (35.1 F)37.2 C (99.0 F)5.0 C (41.0 F)
Sep37.2 C (99.0 F)-12.2 C (10.0 F)30.0 C (86.0 F)-4.4 C (24.1 F)
Oct30.0 C (86.0 F)-18.9 C (-2.0 F)27.8 C (82.0 F)-1.1 C (30.0 F)
Nov23.9 C (75.0 F)-28.3 C (-18.9 F)n/an/a
Dec17.2 C (63.0 F)-36.7 C (-34.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Black Mtn by the year they were set 1,464 records at Black Mtn still stand. 1985 holds the most, with 48. 02040601963: 41964: 181965: 381966: 241967: 121968: 221969: 221970: 191971: 101972: 411973: 301974: 161975: 141976: 91977: 131978: 241979: 211980: 131981: 281982: 241983: 241984: 211985: 481986: 291987: 211988: 221989: 321990: 241991: 181992: 271993: 201994: 91995: 301996: 391997: 191998: 151999: 152000: 292001: 142002: 302003: 422004: 72005: 232006: 252007: 402008: 182009: 232010: 142011: 182012: 312013: 132014: 312015: 152016: 162017: 222018: 132019: 192020: 302021: 322022: 342023: 122024: 302025: 362026: 321963197019771984199119982005201220192026
1,464 records at Black Mtn still stand. 1985 holds the most, with 48.
Standing records at Black Mtn by the year they were set
Year setStanding records
19634
196418
196538
196624
196712
196822
196922
197019
197110
197241
197330
197416
197514
19769
197713
197824
197921
198013
198128
198224
198324
198421
198548
198629
198721
198822
198932
199024
199118
199227
199320
19949
199530
199639
199719
199815
199915
200029
200114
200230
200342
20047
200523
200625
200740
200818
200923
201014
201118
201231
201313
201431
201515
201616
201722
201813
201919
202030
202132
202234
202312
202430
202536
202632

All-Time Record Progression

2 new records
When Black Mtn set new all-time records 2 all-time records were set at Black Mtn between 14 July 2002 and 22 July 2007. Each dot is a new record. Record high maximum temperatureRecord high minimum temperature14 July 2002: Record high maximum temperature 40.0 C (104.0 F)22 July 2007: Record high minimum temperature 25.0 C (77.0 F)2005
2 all-time records were set at Black Mtn between 14 July 2002 and 22 July 2007. Each dot is a new record.
When Black Mtn set new all-time records
DateKindDetail
2002-07-14Record high maximum temperatureRecord high maximum temperature 40.0 C (104.0 F)
2007-07-22Record high minimum temperatureRecord high minimum temperature 25.0 C (77.0 F)

Wettest Day of Each Month

Apr: 59.7 mm (2.4 in)
Record daily precipitation for each month at Black Mtn The wettest day on record for each calendar month at Black Mtn. The most was 59.7 mm (2.4 in) on 28 April 1978. 0204060 Jan: 20.1 mm (0.8 in), 3 January 1972 Jan Feb: 22.9 mm (0.9 in), 1 February 2003 Feb Mar: 31.5 mm (1.2 in), 24 March 2017 Mar Apr: 59.7 mm (2.4 in), 28 April 1978 Apr May: 54.6 mm (2.1 in), 28 May 2019 May Jun: 49.5 mm (1.9 in), 16 June 2023 Jun Jul: 58.4 mm (2.3 in), 16 July 2026 Jul Aug: 35.1 mm (1.4 in), 10 August 1968 Aug Sep: 40.6 mm (1.6 in), 26 September 2013 Sep Oct: 40.6 mm (1.6 in), 3 October 2013 Oct Nov: 26.2 mm (1.0 in), 9 November 2012 Nov Dec: 20.3 mm (0.8 in), 2 December 1982 Dec
The wettest day on record for each calendar month at Black Mtn. The most was 59.7 mm (2.4 in) on 28 April 1978.
Record daily precipitation for each month at Black Mtn
MonthRecord daily precipitation (mm)Date
Jan20.1 mm (0.8 in)3 January 1972
Feb22.9 mm (0.9 in)1 February 2003
Mar31.5 mm (1.2 in)24 March 2017
Apr59.7 mm (2.4 in)28 April 1978
May54.6 mm (2.1 in)28 May 2019
Jun49.5 mm (1.9 in)16 June 2023
Jul58.4 mm (2.3 in)16 July 2026
Aug35.1 mm (1.4 in)10 August 1968
Sep40.6 mm (1.6 in)26 September 2013
Oct40.6 mm (1.6 in)3 October 2013
Nov26.2 mm (1.0 in)9 November 2012
Dec20.3 mm (0.8 in)2 December 1982

Period of Record Coverage

1963 to 2026
Days with data per year at Black Mtn 64 years of record at Black Mtn, 1963 to 2026. 6 years have data for under 90 percent of days and are left out of rankings: 1963, 1976, 1980, 1987, 2001, 2026. 1963: 76 of 365 days1964: 347 of 366 days1965: 365 of 365 days1966: 364 of 365 days1967: 365 of 365 days1968: 366 of 366 days1969: 365 of 365 days1970: 363 of 365 days1971: 365 of 365 days1972: 366 of 366 days1973: 362 of 365 days1974: 331 of 365 days1975: 329 of 365 days1976: 279 of 366 days1977: 362 of 365 days1978: 358 of 365 days1979: 362 of 365 days1980: 327 of 366 days1981: 356 of 365 days1982: 357 of 365 days1983: 336 of 365 days1984: 338 of 366 days1985: 357 of 365 days1986: 343 of 365 days1987: 325 of 365 days1988: 334 of 366 days1989: 359 of 365 days1990: 365 of 365 days1991: 365 of 365 days1992: 364 of 366 days1993: 362 of 365 days1994: 362 of 365 days1995: 364 of 365 days1996: 359 of 366 days1997: 330 of 365 days1998: 359 of 365 days1999: 330 of 365 days2000: 361 of 366 days2001: 302 of 365 days2002: 333 of 365 days2003: 360 of 365 days2004: 366 of 366 days2005: 364 of 365 days2006: 362 of 365 days2007: 363 of 365 days2008: 363 of 366 days2009: 333 of 365 days2010: 355 of 365 days2011: 365 of 365 days2012: 365 of 366 days2013: 365 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 366 of 366 days2017: 365 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 335 of 366 days2021: 365 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 366 of 366 days2025: 364 of 365 days2026: 275 of 365 days197019801990200020102020
64 years of record at Black Mtn, 1963 to 2026. 6 years have data for under 90 percent of days and are left out of rankings: 1963, 1976, 1980, 1987, 2001, 2026.
Days with data per year at Black Mtn
YearDays with dataShare of yearComplete
19637621%No
196434795%Yes
1965365100%Yes
1966364100%Yes
1967365100%Yes
1968366100%Yes
1969365100%Yes
197036399%Yes
1971365100%Yes
1972366100%Yes
197336299%Yes
197433191%Yes
197532990%Yes
197627976%No
197736299%Yes
197835898%Yes
197936299%Yes
198032789%No
198135698%Yes
198235798%Yes
198333692%Yes
198433892%Yes
198535798%Yes
198634394%Yes
198732589%No
198833491%Yes
198935998%Yes
1990365100%Yes
1991365100%Yes
199236499%Yes
199336299%Yes
199436299%Yes
1995364100%Yes
199635998%Yes
199733090%Yes
199835998%Yes
199933090%Yes
200036199%Yes
200130283%No
200233391%Yes
200336099%Yes
2004366100%Yes
2005364100%Yes
200636299%Yes
200736399%Yes
200836399%Yes
200933391%Yes
201035597%Yes
2011365100%Yes
2012365100%Yes
2013365100%Yes
2014365100%Yes
2015365100%Yes
2016366100%Yes
2017365100%Yes
2018365100%Yes
2019365100%Yes
202033592%Yes
2021365100%Yes
2022365100%Yes
2023365100%Yes
2024366100%Yes
2025364100%Yes
202627575%No

Latest Records

20
Latest records at Black Mtn
DateStationRecordValueBeat old record byOld record stoodSignificance
9 October 2026Black Mtn, USdaily high max (Provisional)27.8 C (82.0 F)1.1 C (2.0 F)23 years13 of 100 (Routine)
20 September 2026Black Mtn, USdaily rain (Provisional)22.9 mm (0.9 in)4.6 mm (0.18 in)31 years20 of 100 (Routine)
9 August 2026Black Mtn, USdaily high max (Tie)36.7 C (98.1 F)tie55 years5 of 100 (Routine)
8 August 2026Black Mtn, USdaily low min (Tie)5.6 C (42.1 F)tie1 year1 of 100 (Routine)
5 August 2026Black Mtn, USdaily low max18.9 C (66.0 F)3.9 C (7.0 F)3 years14 of 100 (Routine)
3 August 2026Black Mtn, USdaily high max37.2 C (99.0 F)0.5 C (0.9 F)24 years14 of 100 (Routine)
27 July 2026Black Mtn, USdaily high max (Tie)36.7 C (98.1 F)tie25 years3 of 100 (Routine)
16 July 2026Black Mtn, USmonthly rain58.4 mm (2.3 in)26.4 mm (1.0 in)35 years66 of 100 (Major)
13 July 2026Black Mtn, USall-time high max (Tie)40.0 C (104.0 F)tie23 years8 of 100 (Routine)
13 July 2026Black Mtn, USdaily high min (Tie)21.7 C (71.1 F)tie24 years3 of 100 (Routine)
12 July 2026Black Mtn, USdaily high max (Tie)37.2 C (99.0 F)tie20 years3 of 100 (Routine)
1 June 2026Black Mtn, USdaily low min-3.3 C (26.1 F)5.0 C (9.0 F)48 years30 of 100 (Routine)
31 May 2026Black Mtn, USdaily low min-2.2 C (28.0 F)1.6 C (2.9 F)40 years21 of 100 (Routine)
14 May 2026Black Mtn, USdaily high max31.1 C (88.0 F)1.1 C (2.0 F)37 years18 of 100 (Routine)
25 April 2026Black Mtn, USdaily low min-11.1 C (12.0 F)6.1 C (11.0 F)17 years23 of 100 (Routine)
24 April 2026Black Mtn, USdaily low min-10.6 C (12.9 F)5.0 C (9.0 F)24 years22 of 100 (Routine)
24 April 2026Black Mtn, USdaily snow depth (Tie)10.2 cm (4.0 in)tie17 years2 of 100 (Routine)
21 April 2026Black Mtn, USdaily high min11.7 C (53.1 F)0.6 C (1.1 F)36 years17 of 100 (Routine)
30 March 2026Black Mtn, USmonthly high min12.2 C (54.0 F)0.5 C (0.9 F)11 years19 of 100 (Routine)
30 March 2026Black Mtn, USdaily high max (Tie)21.1 C (70.0 F)tie48 years5 of 100 (Routine)

Climate Trend

49 complete years, 1965 to 2025
Annual mean temperature at Black Mtn as warming stripes, 1965 to 2025 One stripe for each of 49 complete years at Black Mtn, 1965 to 2025. Blue stripes are years cooler than the station's own mean of 8.1 C (46.5 F); red stripes are warmer. The coolest year was 1985, at 5.9 C (42.6 F), and the warmest was 2012, at 10.6 C (51.1 F). The strongest colour marks a difference of 2.6 C (4.7 F). 1965: 7.6 C, -0.5 C from the station mean1966: 8.6 C, +0.6 C from the station mean1967: 7.5 C, -0.5 C from the station mean1968: 7.2 C, -0.8 C from the station mean1969: 8.1 C, 0.0 C from the station mean1970: 7.5 C, -0.5 C from the station mean1971: 7.2 C, -0.9 C from the station mean1972: 6.9 C, -1.1 C from the station mean1973: 7.4 C, -0.7 C from the station mean1975: 6.4 C, -1.6 C from the station mean1977: 8.2 C, +0.2 C from the station mean1978: 6.6 C, -1.4 C from the station mean1979: 7.9 C, -0.2 C from the station mean1982: 6.3 C, -1.8 C from the station mean1983: 7.2 C, -0.9 C from the station mean1985: 5.9 C, -2.2 C from the station mean1986: 7.4 C, -0.7 C from the station mean1987: 7.7 C, -0.4 C from the station mean1989: 7.2 C, -0.9 C from the station mean1990: 8.4 C, +0.3 C from the station mean1991: 8.1 C, 0.0 C from the station mean1992: 9.0 C, +1.0 C from the station mean1993: 6.9 C, -1.2 C from the station mean1994: 9.3 C, +1.2 C from the station mean1995: 7.8 C, -0.2 C from the station mean1996: 7.6 C, -0.5 C from the station mean1998: 8.4 C, +0.3 C from the station mean2000: 8.6 C, +0.6 C from the station mean2003: 8.5 C, +0.5 C from the station mean2004: 8.7 C, +0.6 C from the station mean2005: 9.3 C, +1.2 C from the station mean2006: 9.6 C, +1.5 C from the station mean2007: 9.5 C, +1.4 C from the station mean2008: 8.2 C, +0.1 C from the station mean2010: 8.9 C, +0.8 C from the station mean2011: 8.4 C, +0.3 C from the station mean2012: 10.6 C, +2.5 C from the station mean2013: 8.6 C, +0.5 C from the station mean2014: 7.7 C, -0.4 C from the station mean2015: 9.2 C, +1.2 C from the station mean2016: 9.4 C, +1.3 C from the station mean2017: 8.6 C, +0.6 C from the station mean2018: 8.1 C, 0.0 C from the station mean2019: 6.7 C, -1.3 C from the station mean2021: 8.8 C, +0.8 C from the station mean2022: 7.6 C, -0.4 C from the station mean2023: 8.4 C, +0.3 C from the station mean2024: 9.2 C, +1.1 C from the station mean2025: 8.4 C, +0.3 C from the station mean1965197019801990200020102020
One stripe for each of 49 complete years at Black Mtn, 1965 to 2025. Blue stripes are years cooler than the station's own mean of 8.1 C (46.5 F); red stripes are warmer. The coolest year was 1985, at 5.9 C (42.6 F), and the warmest was 2012, at 10.6 C (51.1 F). The strongest colour marks a difference of 2.6 C (4.7 F).
Annual mean temperature at Black Mtn as warming stripes, 1965 to 2025
YearAnnual mean temperatureDifference from the station mean
19657.6 C-0.45 C
19668.6 C+0.56 C
19677.5 C-0.53 C
19687.2 C-0.84 C
19698.1 C+0.03 C
19707.5 C-0.54 C
19717.2 C-0.91 C
19726.9 C-1.12 C
19737.4 C-0.70 C
19756.4 C-1.64 C
19778.2 C+0.17 C
19786.6 C-1.44 C
19797.9 C-0.20 C
19826.3 C-1.76 C
19837.2 C-0.90 C
19855.9 C-2.19 C
19867.4 C-0.68 C
19877.7 C-0.40 C
19897.2 C-0.90 C
19908.4 C+0.32 C
19918.1 C+0.01 C
19929.0 C+0.98 C
19936.9 C-1.21 C
19949.3 C+1.21 C
19957.8 C-0.24 C
19967.6 C-0.49 C
19988.4 C+0.31 C
20008.6 C+0.57 C
20038.5 C+0.48 C
20048.7 C+0.60 C
20059.3 C+1.21 C
20069.6 C+1.50 C
20079.5 C+1.42 C
20088.2 C+0.11 C
20108.9 C+0.85 C
20118.4 C+0.29 C
201210.6 C+2.55 C
20138.6 C+0.49 C
20147.7 C-0.36 C
20159.2 C+1.18 C
20169.4 C+1.29 C
20178.6 C+0.56 C
20188.1 C+0.05 C
20196.7 C-1.33 C
20218.8 C+0.77 C
20227.6 C-0.42 C
20238.4 C+0.33 C
20249.2 C+1.10 C
20258.4 C+0.34 C

The annual mean temperature here has risen by 0.3 C (0.1 to 0.4) per decade over 1965 to 2025. In Fahrenheit: 0.5 F (0.3 to 0.7) per decade. The slope is a straight line fitted to 49 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Black Mtn
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.3 C (0.1 to 0.4) per decade0.5 F (0.3 to 0.7) per decade1965 to 202549Rise
Mean daily maximum0.2 C (0.1 to 0.4) per decade0.4 F (0.2 to 0.7) per decade1965 to 202549Rise
Mean daily minimum0.3 C (0.1 to 0.5) per decade0.5 F (0.2 to 0.8) per decade1965 to 202549Rise

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

1963 to 2026
Yearly extremes at Black Mtn: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)40.0 C (104.0 F)200236.4 C (97.5 F)64
Coldest night (TNn)-37.8 C (-36.0 F)1989-25.6 C (-14.1 F)64
Wettest day (Rx1day)59.7 mm (2.4 in)197830.3 mm (1.2 in)64
Wettest five days (Rx5day)103.4 mm (4.1 in)197848.6 mm (1.9 in)64
Longest dry spell (CDD)85 days200633 days64

Hottest day (TXx)

Hottest day (TXx) at Black Mtn by year The hottest day of the year at Black Mtn, 1963 to 2026. The record is 40.0 C (104.0 F) in 2002, marked on the chart; the median year is 36.4 C (97.5 F). 2025303540198020002020Record: 40.0 C (104.0 F) in 2002
The hottest day of the year at Black Mtn, 1963 to 2026. The record is 40.0 C (104.0 F) in 2002, marked on the chart; the median year is 36.4 C (97.5 F).
Hottest day (TXx) at Black Mtn by year
YearHottest day (TXx)
196323.3 C (73.9 F)
196435.0 C (95.0 F)
196534.4 C (93.9 F)
196636.7 C (98.1 F)
196732.8 C (91.0 F)
196833.9 C (93.0 F)
196935.6 C (96.1 F)
197036.1 C (97.0 F)
197136.7 C (98.1 F)
197235.6 C (96.1 F)
197337.2 C (99.0 F)
197435.0 C (95.0 F)
197535.0 C (95.0 F)
197632.8 C (91.0 F)
197736.7 C (98.1 F)
197835.0 C (95.0 F)
197937.8 C (100.0 F)
198035.6 C (96.1 F)
198137.8 C (100.0 F)
198236.7 C (98.1 F)
198337.2 C (99.0 F)
198435.6 C (96.1 F)
198536.7 C (98.1 F)
198635.6 C (96.1 F)
198732.2 C (90.0 F)
198838.9 C (102.0 F)
198938.3 C (100.9 F)
199036.7 C (98.1 F)
199136.1 C (97.0 F)
199235.0 C (95.0 F)
199335.0 C (95.0 F)
199435.6 C (96.1 F)
199536.7 C (98.1 F)
199636.7 C (98.1 F)
199737.2 C (99.0 F)
199838.3 C (100.9 F)
199936.7 C (98.1 F)
200037.8 C (100.0 F)
200138.9 C (102.0 F)
200240.0 C (104.0 F)
200339.4 C (102.9 F)
200436.1 C (97.0 F)
200538.9 C (102.0 F)
200640.0 C (104.0 F)
200739.4 C (102.9 F)
200836.7 C (98.1 F)
200935.0 C (95.0 F)
201036.7 C (98.1 F)
201136.1 C (97.0 F)
201237.8 C (100.0 F)
201336.7 C (98.1 F)
201436.1 C (97.0 F)
201534.4 C (93.9 F)
201636.1 C (97.0 F)
201735.6 C (96.1 F)
201837.2 C (99.0 F)
201934.4 C (93.9 F)
202035.0 C (95.0 F)
202138.3 C (100.9 F)
202237.2 C (99.0 F)
202335.0 C (95.0 F)
202436.1 C (97.0 F)
202536.1 C (97.0 F)
202640.0 C (104.0 F)

Coldest night (TNn)

Coldest night (TNn) at Black Mtn by year The coldest night of the year at Black Mtn, 1963 to 2026. The record is -37.8 C (-36.0 F) in 1989, marked on the chart; the median year is -25.6 C (-14.1 F). -40-30-20-10198020002020Record: -37.8 C (-36.0 F) in 1989
The coldest night of the year at Black Mtn, 1963 to 2026. The record is -37.8 C (-36.0 F) in 1989, marked on the chart; the median year is -25.6 C (-14.1 F).
Coldest night (TNn) at Black Mtn by year
YearColdest night (TNn)
1963-21.1 C (-6.0 F)
1964-32.8 C (-27.0 F)
1965-24.4 C (-11.9 F)
1966-25.6 C (-14.1 F)
1967-21.7 C (-7.1 F)
1968-29.4 C (-20.9 F)
1969-23.9 C (-11.0 F)
1970-24.4 C (-11.9 F)
1971-21.1 C (-6.0 F)
1972-36.7 C (-34.1 F)
1973-27.2 C (-17.0 F)
1974-26.1 C (-15.0 F)
1975-24.4 C (-11.9 F)
1976-23.9 C (-11.0 F)
1977-26.1 C (-15.0 F)
1978-27.2 C (-17.0 F)
1979-27.8 C (-18.0 F)
1980-27.8 C (-18.0 F)
1981-30.0 C (-22.0 F)
1982-28.3 C (-18.9 F)
1983-34.4 C (-29.9 F)
1984-27.2 C (-17.0 F)
1985-31.1 C (-24.0 F)
1986-28.3 C (-18.9 F)
1987-20.0 C (-4.0 F)
1988-22.2 C (-8.0 F)
1989-37.8 C (-36.0 F)
1990-36.1 C (-33.0 F)
1991-25.0 C (-13.0 F)
1992-25.0 C (-13.0 F)
1993-26.1 C (-15.0 F)
1994-23.3 C (-9.9 F)
1995-23.3 C (-9.9 F)
1996-27.8 C (-18.0 F)
1997-16.1 C (3.0 F)
1998-32.8 C (-27.0 F)
1999-16.7 C (1.9 F)
2000-24.4 C (-11.9 F)
2001-15.0 C (5.0 F)
2002-23.3 C (-9.9 F)
2003-27.8 C (-18.0 F)
2004-26.7 C (-16.1 F)
2005-23.9 C (-11.0 F)
2006-28.3 C (-18.9 F)
2007-24.4 C (-11.9 F)
2008-26.7 C (-16.1 F)
2009-22.2 C (-8.0 F)
2010-24.4 C (-11.9 F)
2011-26.7 C (-16.1 F)
2012-16.7 C (1.9 F)
2013-27.8 C (-18.0 F)
2014-29.4 C (-20.9 F)
2015-20.6 C (-5.1 F)
2016-25.6 C (-14.1 F)
2017-22.2 C (-8.0 F)
2018-24.4 C (-11.9 F)
2019-25.0 C (-13.0 F)
2020-18.9 C (-2.0 F)
2021-27.8 C (-18.0 F)
2022-32.8 C (-27.0 F)
2023-27.2 C (-17.0 F)
2024-35.0 C (-31.0 F)
2025-23.9 C (-11.0 F)
2026-20.0 C (-4.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Black Mtn by year The wettest day of the year at Black Mtn, 1963 to 2026. The record is 59.7 mm (2.4 in) in 1978, marked on the chart; the median year is 30.3 mm (1.2 in). 0204060198020002020Record: 59.7 mm (2.4 in) in 1978
The wettest day of the year at Black Mtn, 1963 to 2026. The record is 59.7 mm (2.4 in) in 1978, marked on the chart; the median year is 30.3 mm (1.2 in).
Wettest day (Rx1day) at Black Mtn by year
YearWettest day (Rx1day)
196310.7 mm (0.4 in)
196452.8 mm (2.1 in)
196520.8 mm (0.8 in)
196618.8 mm (0.7 in)
196730.0 mm (1.2 in)
196835.1 mm (1.4 in)
196922.9 mm (0.9 in)
197020.1 mm (0.8 in)
197133.8 mm (1.3 in)
197223.4 mm (0.9 in)
197326.7 mm (1.1 in)
197420.6 mm (0.8 in)
197538.6 mm (1.5 in)
197626.7 mm (1.1 in)
197734.3 mm (1.4 in)
197859.7 mm (2.4 in)
197935.3 mm (1.4 in)
198015.2 mm (0.6 in)
198135.8 mm (1.4 in)
198238.1 mm (1.5 in)
198331.8 mm (1.3 in)
198415.5 mm (0.6 in)
198524.1 mm (0.9 in)
198624.6 mm (1.0 in)
198726.7 mm (1.1 in)
198829.2 mm (1.1 in)
198930.5 mm (1.2 in)
199032.0 mm (1.3 in)
199124.6 mm (1.0 in)
199225.4 mm (1.0 in)
199331.8 mm (1.3 in)
199434.3 mm (1.4 in)
199538.9 mm (1.5 in)
199633.5 mm (1.3 in)
199726.7 mm (1.1 in)
199830.5 mm (1.2 in)
199931.8 mm (1.3 in)
200048.3 mm (1.9 in)
200123.9 mm (0.9 in)
200220.6 mm (0.8 in)
200323.9 mm (0.9 in)
200428.7 mm (1.1 in)
200531.8 mm (1.3 in)
200624.4 mm (1.0 in)
200726.2 mm (1.0 in)
200826.2 mm (1.0 in)
200932.5 mm (1.3 in)
201019.8 mm (0.8 in)
201139.4 mm (1.6 in)
201226.2 mm (1.0 in)
201340.6 mm (1.6 in)
201433.5 mm (1.3 in)
201537.3 mm (1.5 in)
201639.4 mm (1.6 in)
201736.3 mm (1.4 in)
201828.7 mm (1.1 in)
201954.6 mm (2.1 in)
202022.6 mm (0.9 in)
202117.3 mm (0.7 in)
202234.8 mm (1.4 in)
202349.5 mm (1.9 in)
202434.3 mm (1.4 in)
202525.4 mm (1.0 in)
202658.4 mm (2.3 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Black Mtn by year The wettest five days of the year at Black Mtn, 1963 to 2026. The record is 103.4 mm (4.1 in) in 1978, marked on the chart; the median year is 48.6 mm (1.9 in). 0255075100125198020002020Record: 103.4 mm (4.1 in) in 1978
The wettest five days of the year at Black Mtn, 1963 to 2026. The record is 103.4 mm (4.1 in) in 1978, marked on the chart; the median year is 48.6 mm (1.9 in).
Wettest five days (Rx5day) at Black Mtn by year
YearWettest five days (Rx5day)
196317.6 mm (0.7 in)
196473.4 mm (2.9 in)
196539.1 mm (1.5 in)
196633.0 mm (1.3 in)
196774.4 mm (2.9 in)
196855.9 mm (2.2 in)
196950.8 mm (2.0 in)
197043.5 mm (1.7 in)
197154.9 mm (2.2 in)
197227.5 mm (1.1 in)
197348.3 mm (1.9 in)
197421.1 mm (0.8 in)
197549.1 mm (1.9 in)
197665.5 mm (2.6 in)
197741.9 mm (1.6 in)
1978103.4 mm (4.1 in)
197939.4 mm (1.6 in)
198036.6 mm (1.4 in)
198146.5 mm (1.8 in)
198263.0 mm (2.5 in)
198352.9 mm (2.1 in)
198429.2 mm (1.1 in)
198539.6 mm (1.6 in)
198628.4 mm (1.1 in)
198739.2 mm (1.5 in)
198831.3 mm (1.2 in)
198958.5 mm (2.3 in)
199046.8 mm (1.8 in)
199149.0 mm (1.9 in)
199240.3 mm (1.6 in)
199367.5 mm (2.7 in)
199471.4 mm (2.8 in)
199577.7 mm (3.1 in)
199682.3 mm (3.2 in)
199747.0 mm (1.9 in)
199849.1 mm (1.9 in)
199945.0 mm (1.8 in)
200055.6 mm (2.2 in)
200135.6 mm (1.4 in)
200229.8 mm (1.2 in)
200354.4 mm (2.1 in)
200439.1 mm (1.5 in)
200522.1 mm (0.9 in)
200624.6 mm (1.0 in)
200750.2 mm (2.0 in)
200865.3 mm (2.6 in)
200948.2 mm (1.9 in)
201040.1 mm (1.6 in)
201161.2 mm (2.4 in)
201231.8 mm (1.3 in)
201362.4 mm (2.5 in)
201448.3 mm (1.9 in)
201578.5 mm (3.1 in)
201681.0 mm (3.2 in)
201773.9 mm (2.9 in)
201842.1 mm (1.7 in)
201974.7 mm (2.9 in)
202034.8 mm (1.4 in)
202143.3 mm (1.7 in)
202254.1 mm (2.1 in)
202357.4 mm (2.3 in)
202455.2 mm (2.2 in)
202548.9 mm (1.9 in)
202658.4 mm (2.3 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Black Mtn by year The longest dry spell of the year at Black Mtn, 1963 to 2026. The record is 85 days in 2006, marked on the chart; the median year is 33 days. 020406080100198020002020Record: 85 days in 2006
The longest dry spell of the year at Black Mtn, 1963 to 2026. The record is 85 days in 2006, marked on the chart; the median year is 33 days.
Longest dry spell (CDD) at Black Mtn by year
YearLongest dry spell (CDD)
196323 days
196465 days
196538 days
196642 days
196722 days
196833 days
196944 days
197054 days
197166 days
197223 days
197328 days
197451 days
197533 days
197633 days
197730 days
197832 days
197948 days
198032 days
198134 days
198218 days
198341 days
198451 days
198534 days
198629 days
198726 days
198844 days
198927 days
199033 days
199133 days
199230 days
199348 days
199424 days
199517 days
199640 days
199722 days
199824 days
199932 days
200043 days
200129 days
200238 days
200346 days
200426 days
200526 days
200685 days
200727 days
200827 days
200938 days
201021 days
201130 days
201258 days
201339 days
201438 days
201531 days
201648 days
201734 days
201830 days
201916 days
202028 days
202139 days
202222 days
202328 days
202440 days
202539 days
202646 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

49 years with a frost

Across 49 years with a frost, the median last spring frost at Black Mtn falls on 22 May and the median first autumn frost on 29 September, which leaves a median of 130 days between them.

Fitted over all years, the growing season changes by +2.2 days per decade at this station.

Frost dates and growing season at Black Mtn
MeasureMedian, all yearsEarliest periodRecent period (1990 to 2025)Recent against earliestFitted trend
Last spring frost22 Mayn/a21 Mayn/a-0.6 days per decade
First autumn frost29 Septembern/a30 Septembern/a+1.5 days per decade
Growing days130 daysn/a131 daysn/a+2.2 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, 1964 to 2025

A day with at least 30.0 mm (1.2 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 Black Mtn: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years30.0 mm (1.2 in)
5 years38.7 mm (1.5 in)
10 years44.1 mm (1.7 in)
25 years50.6 mm (2.0 in)
50 years55.2 mm (2.2 in)
100 years59.6 mm (2.3 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 1964 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: 59.7 mm (2.4 in) in 1978; 54.6 mm (2.1 in) in 2019; 52.8 mm (2.1 in) in 1964.

Station Changes

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

Climate Twins

2010 to 2025 against 1961 to 1990

Over 2010 to 2025, Black Mtn had a mean temperature of 8.6 C (47.4 F) and 425.4 mm (16.7 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Hemingford (United States, 407 km away), Glenrock 5 ESE (United States, 183 km away) and Metropolis (United States, 652 km away).

Climate twins of Black Mtn: stations whose 1961 to 1990 climate is closest to its 2010 to 2025 climate
Twin stationCountryDistance awayMean temperature, 1961-1990Rain a year, 1961-1990Climate difference
HemingfordUnited States407 km (253 mi)8.5 C (47.3 F)438.8 mm (17.3 in)1.11
Glenrock 5 ESEUnited States183 km (114 mi)8.9 C (47.9 F)324.4 mm (12.8 in)1.14
MetropolisUnited States652 km (405 mi)8.4 C (47.1 F)353.1 mm (13.9 in)1.23

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 Black Mtn standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Black Mtn 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).