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Built 2026-10-16 (16 October 2026)

Dayton Weather Records (USC00482399)

Record envelope, standing records and threshold days for Dayton (USC00482399), Wyoming, United States, with 76 years of record.

Key Facts for Dayton

  • Dayton (USC00482399) is a weather station in Wyoming, United States at 44.88 latitude and -107.26 longitude, 1,195 m (3,920 ft) above sea level.
  • The station reports from 1951 to 2026, 76 years of record.
  • 1,464 records set at Dayton still stand.
  • Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Dayton set a daily record precipitation of 16.5 mm (0.6 in) on 8 July 2026.

About the Station

  • Location: Wyoming, United States, 44.88 latitude, -107.26 longitude.
  • Elevation: 1,195 m (3,920 ft).
  • Period of record: 1951 to 2026, 76 years.
  • Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

44 days at or beyond a record
Daily record high and record low at Dayton, with 2026 drawn through them The band shows the record high and record low for each calendar day at Dayton. The lines show the 2026 daily maximum and minimum. 44 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Dayton. The lines show the 2026 daily maximum and minimum. 44 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Dayton, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan20.0 C (68.0 F)-37.2 C (-35.0 F)16.7 C (62.1 F)-27.2 C (-17.0 F)
Feb24.4 C (75.9 F)-38.9 C (-38.0 F)24.4 C (75.9 F)-23.3 C (-9.9 F)
Mar27.8 C (82.0 F)-32.8 C (-27.0 F)26.7 C (80.1 F)-14.4 C (6.1 F)
Apr29.4 C (84.9 F)-20.0 C (-4.0 F)28.9 C (84.0 F)-9.4 C (15.1 F)
May37.2 C (99.0 F)-9.4 C (15.1 F)37.2 C (99.0 F)-9.4 C (15.1 F)
Jun41.7 C (107.1 F)-2.2 C (28.0 F)33.9 C (93.0 F)1.1 C (34.0 F)
Jul41.7 C (107.1 F)-1.1 C (30.0 F)41.7 C (107.1 F)7.2 C (45.0 F)
Aug38.9 C (102.0 F)-2.2 C (28.0 F)36.1 C (97.0 F)5.6 C (42.1 F)
Sep38.9 C (102.0 F)-7.2 C (19.0 F)33.3 C (91.9 F)3.3 C (37.9 F)
Oct32.2 C (90.0 F)-22.8 C (-9.0 F)27.8 C (82.0 F)1.7 C (35.1 F)
Nov26.1 C (79.0 F)-27.2 C (-17.0 F)n/an/a
Dec24.4 C (75.9 F)-39.4 C (-38.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Dayton by the year they were set 1,464 records at Dayton still stand. 2009 holds the most, with 101. 0501001502006: 22007: 732008: 832009: 1012010: 572011: 692012: 902013: 672014: 652015: 622016: 672017: 942018: 612019: 712020: 722021: 752022: 812023: 572024: 652025: 892026: 632006200920122015201820212024
1,464 records at Dayton still stand. 2009 holds the most, with 101.
Standing records at Dayton by the year they were set
Year setStanding records
20062
200773
200883
2009101
201057
201169
201290
201367
201465
201562
201667
201794
201861
201971
202072
202175
202281
202357
202465
202589
202663

Wettest Day of Each Month

Nov: 101.6 mm (4.0 in)
Record daily precipitation for each month at Dayton The wettest day on record for each calendar month at Dayton. The most was 101.6 mm (4.0 in) on 16 November 2000. 050100150 Jan: 38.1 mm (1.5 in), 28 January 2023 Jan Feb: 22.9 mm (0.9 in), 11 February 2004 Feb Mar: 49.0 mm (1.9 in), 11 March 2014 Mar Apr: 47.5 mm (1.9 in), 22 April 1958 Apr May: 67.8 mm (2.7 in), 25 May 2015 May Jun: 50.5 mm (2.0 in), 8 June 1993 Jun Jul: 68.3 mm (2.7 in), 20 July 1997 Jul Aug: 65.0 mm (2.6 in), 5 August 1997 Aug Sep: 43.2 mm (1.7 in), 25 September 2016 Sep Oct: 36.8 mm (1.4 in), 4 October 2013 Oct Nov: 101.6 mm (4.0 in), 16 November 2000 Nov Dec: 40.6 mm (1.6 in), 25 December 2014 Dec
The wettest day on record for each calendar month at Dayton. The most was 101.6 mm (4.0 in) on 16 November 2000.
Record daily precipitation for each month at Dayton
MonthRecord daily precipitation (mm)Date
Jan38.1 mm (1.5 in)28 January 2023
Feb22.9 mm (0.9 in)11 February 2004
Mar49.0 mm (1.9 in)11 March 2014
Apr47.5 mm (1.9 in)22 April 1958
May67.8 mm (2.7 in)25 May 2015
Jun50.5 mm (2.0 in)8 June 1993
Jul68.3 mm (2.7 in)20 July 1997
Aug65.0 mm (2.6 in)5 August 1997
Sep43.2 mm (1.7 in)25 September 2016
Oct36.8 mm (1.4 in)4 October 2013
Nov101.6 mm (4.0 in)16 November 2000
Dec40.6 mm (1.6 in)25 December 2014

Period of Record Coverage

2006 to 2026
Days with data per year at Dayton 21 years of record at Dayton, 2006 to 2026. 3 years have data for under 90 percent of days and are left out of rankings: 2006, 2024, 2026. 2006: 31 of 365 days2007: 358 of 365 days2008: 346 of 366 days2009: 351 of 365 days2010: 346 of 365 days2011: 362 of 365 days2012: 364 of 366 days2013: 354 of 365 days2014: 338 of 365 days2015: 351 of 365 days2016: 366 of 366 days2017: 365 of 365 days2018: 365 of 365 days2019: 343 of 365 days2020: 360 of 366 days2021: 354 of 365 days2022: 363 of 365 days2023: 365 of 365 days2024: 275 of 366 days2025: 365 of 365 days2026: 253 of 365 days2010201520202025
21 years of record at Dayton, 2006 to 2026. 3 years have data for under 90 percent of days and are left out of rankings: 2006, 2024, 2026.
Days with data per year at Dayton
YearDays with dataShare of yearComplete
2006318%No
200735898%Yes
200834695%Yes
200935196%Yes
201034695%Yes
201136299%Yes
201236499%Yes
201335497%Yes
201433893%Yes
201535196%Yes
2016366100%Yes
2017365100%Yes
2018365100%Yes
201934394%Yes
202036098%Yes
202135497%Yes
202236399%Yes
2023365100%Yes
202427575%No
2025365100%Yes
202625369%No

Latest Records

20
Latest records at Dayton
DateStationRecordValueBeat old record byOld record stoodSignificance
8 July 2026Dayton, USdaily rain16.5 mm (0.6 in)8.9 mm (0.35 in)12 years20 of 100 (Routine)
13 June 2026Dayton, USdaily rain25.4 mm (1.0 in)9.1 mm (0.36 in)20 years25 of 100 (Routine)
16 April 2026Dayton, USdaily snowfall5.1 cm (2.0 in)2.6 cm (1.0 in)4 years12 of 100 (Routine)
16 April 2026Dayton, USdaily snow depth (Tie)5.1 cm (2.0 in)tie4 years2 of 100 (Routine)
3 April 2026Dayton, USdaily rain33.0 mm (1.3 in)19.5 mm (0.8 in)8 years38 of 100 (Notable)
3 April 2026Dayton, USmonthly snowfall30.5 cm (12.0 in)2.6 cm (1.0 in)5 years22 of 100 (Routine)
3 April 2026Dayton, USdaily snow depth (Tie)25.4 cm (10.0 in)tie3 years1 of 100 (Routine)
14 March 2026Dayton, USdaily rain14.2 mm (0.6 in)6.8 mm (0.27 in)24 years20 of 100 (Routine)
14 March 2026Dayton, USdaily snowfall15.2 cm (6.0 in)5.0 cm (2.0 in)24 years21 of 100 (Routine)
28 December 2025Dayton, USdaily rain8.4 mm (0.33 in)3.8 mm (0.15 in)22 years20 of 100 (Routine)
12 December 2025Dayton, USdaily snowfall10.2 cm (4.0 in)6.4 cm (2.5 in)32 years30 of 100 (Routine)
9 December 2025Dayton, USdaily rain8.4 mm (0.33 in)4.6 mm (0.18 in)6 years18 of 100 (Routine)
6 December 2025Dayton, USdaily rain16.5 mm (0.6 in)7.9 mm (0.31 in)12 years20 of 100 (Routine)
29 August 2025Dayton, USdaily rain13.2 mm (0.5 in)5.8 mm (0.23 in)28 years20 of 100 (Routine)
28 August 2025Dayton, USdaily rain10.9 mm (0.4 in)4.5 mm (0.18 in)7 years15 of 100 (Routine)
29 July 2025Dayton, USdaily rain5.1 mm (0.20 in)3.6 mm (0.14 in)8 years13 of 100 (Routine)
15 July 2025Dayton, USdaily rain11.4 mm (0.4 in)7.1 mm (0.28 in)16 years20 of 100 (Routine)
18 March 2025Dayton, USdaily snowfall30.5 cm (12.0 in)18.1 cm (7.1 in)11 years38 of 100 (Notable)
18 March 2025Dayton, USdaily rain35.6 mm (1.4 in)13.5 mm (0.5 in)11 years36 of 100 (Notable)
18 March 2025Dayton, USdaily snow depth30.5 cm (12.0 in)2.6 cm (1.0 in)2 years10 of 100 (Routine)

Climate Trend

14 complete years, 2007 to 2025
Annual mean temperature at Dayton as warming stripes, 2007 to 2025 One stripe for each of 14 complete years at Dayton, 2007 to 2025. Blue stripes are years cooler than the station's own mean of 6.7 C (44.1 F); red stripes are warmer. The coolest year was 2019, at 4.7 C (40.4 F), and the warmest was 2023, at 8.6 C (47.5 F). The strongest colour marks a difference of 2.1 C (3.8 F). 2007: 7.2 C, +0.5 C from the station mean2008: 5.7 C, -1.0 C from the station mean2011: 6.3 C, -0.4 C from the station mean2012: 8.1 C, +1.4 C from the station mean2013: 6.7 C, 0.0 C from the station mean2016: 7.1 C, +0.4 C from the station mean2017: 5.8 C, -0.9 C from the station mean2018: 5.1 C, -1.7 C from the station mean2019: 4.7 C, -2.0 C from the station mean2020: 7.2 C, +0.5 C from the station mean2021: 7.3 C, +0.6 C from the station mean2022: 6.3 C, -0.4 C from the station mean2023: 8.6 C, +1.9 C from the station mean2025: 7.9 C, +1.2 C from the station mean200720102012201420162018202020222024
One stripe for each of 14 complete years at Dayton, 2007 to 2025. Blue stripes are years cooler than the station's own mean of 6.7 C (44.1 F); red stripes are warmer. The coolest year was 2019, at 4.7 C (40.4 F), and the warmest was 2023, at 8.6 C (47.5 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Dayton as warming stripes, 2007 to 2025
YearAnnual mean temperatureDifference from the station mean
20077.2 C+0.47 C
20085.7 C-1.01 C
20116.3 C-0.41 C
20128.1 C+1.38 C
20136.7 C-0.03 C
20167.1 C+0.42 C
20175.8 C-0.89 C
20185.1 C-1.67 C
20194.7 C-2.05 C
20207.2 C+0.51 C
20217.3 C+0.55 C
20226.3 C-0.39 C
20238.6 C+1.89 C
20257.9 C+1.20 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

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 Dayton: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)41.7 C (107.1 F)202137.2 C (99.0 F)21
Coldest night (TNn)-39.4 C (-38.9 F)2016-30.6 C (-23.1 F)21
Wettest day (Rx1day)101.6 mm (4.0 in)200036.2 mm (1.4 in)44
Wettest five days (Rx5day)153.1 mm (6.0 in)200554.7 mm (2.2 in)44
Longest dry spell (CDD)47 days200726 days44

Hottest day (TXx)

Hottest day (TXx) at Dayton by year The hottest day of the year at Dayton, 1951 to 2026. The record is 41.7 C (107.1 F) in 2021, marked on the chart; the median year is 37.2 C (99.0 F). 10203040501960198020002020Record: 41.7 C (107.1 F) in 2021
The hottest day of the year at Dayton, 1951 to 2026. The record is 41.7 C (107.1 F) in 2021, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Dayton by year
YearHottest day (TXx)
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
2001n/a
2002n/a
2003n/a
2004n/a
2005n/a
200615.0 C (59.0 F)
200737.8 C (100.0 F)
200838.3 C (100.9 F)
200934.4 C (93.9 F)
201037.2 C (99.0 F)
201136.1 C (97.0 F)
201238.3 C (100.9 F)
201336.1 C (97.0 F)
201437.2 C (99.0 F)
201537.8 C (100.0 F)
201637.2 C (99.0 F)
201736.1 C (97.0 F)
201837.8 C (100.0 F)
201935.0 C (95.0 F)
202038.9 C (102.0 F)
202141.7 C (107.1 F)
202238.9 C (102.0 F)
202337.2 C (99.0 F)
202437.2 C (99.0 F)
202538.9 C (102.0 F)
202641.7 C (107.1 F)

Coldest night (TNn)

Coldest night (TNn) at Dayton by year The coldest night of the year at Dayton, 1951 to 2026. The record is -39.4 C (-38.9 F) in 2016, marked on the chart; the median year is -30.6 C (-23.1 F). -40-35-30-25-201960198020002020Record: -39.4 C (-38.9 F) in 2016
The coldest night of the year at Dayton, 1951 to 2026. The record is -39.4 C (-38.9 F) in 2016, marked on the chart; the median year is -30.6 C (-23.1 F).
Coldest night (TNn) at Dayton by year
YearColdest night (TNn)
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
2001n/a
2002n/a
2003n/a
2004n/a
2005n/a
2006-21.1 C (-6.0 F)
2007-28.3 C (-18.9 F)
2008-32.2 C (-26.0 F)
2009-30.6 C (-23.1 F)
2010-29.4 C (-20.9 F)
2011-30.0 C (-22.0 F)
2012-25.6 C (-14.1 F)
2013-32.8 C (-27.0 F)
2014-32.2 C (-26.0 F)
2015-25.0 C (-13.0 F)
2016-39.4 C (-38.9 F)
2017-31.7 C (-25.1 F)
2018-33.9 C (-29.0 F)
2019-32.8 C (-27.0 F)
2020-23.3 C (-9.9 F)
2021-32.2 C (-26.0 F)
2022-26.7 C (-16.1 F)
2023-24.4 C (-11.9 F)
2024-37.2 C (-35.0 F)
2025-38.9 C (-38.0 F)
2026-27.2 C (-17.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Dayton by year The wettest day of the year at Dayton, 1951 to 2026. The record is 101.6 mm (4.0 in) in 2000, marked on the chart; the median year is 36.2 mm (1.4 in). 02550751001251960198020002020Record: 101.6 mm (4.0 in) in 2000
The wettest day of the year at Dayton, 1951 to 2026. The record is 101.6 mm (4.0 in) in 2000, marked on the chart; the median year is 36.2 mm (1.4 in).
Wettest day (Rx1day) at Dayton by year
YearWettest day (Rx1day)
195150.8 mm (2.0 in)
195243.2 mm (1.7 in)
195336.3 mm (1.4 in)
195415.7 mm (0.6 in)
195521.1 mm (0.8 in)
195648.5 mm (1.9 in)
195736.8 mm (1.4 in)
195847.5 mm (1.9 in)
199130.5 mm (1.2 in)
199239.9 mm (1.6 in)
199350.5 mm (2.0 in)
199435.3 mm (1.4 in)
199534.8 mm (1.4 in)
199636.1 mm (1.4 in)
199768.3 mm (2.7 in)
199820.6 mm (0.8 in)
199932.0 mm (1.3 in)
2000101.6 mm (4.0 in)
200118.5 mm (0.7 in)
200219.3 mm (0.8 in)
200340.1 mm (1.6 in)
200422.9 mm (0.9 in)
200564.0 mm (2.5 in)
20062.8 mm (0.11 in)
200741.7 mm (1.6 in)
200836.1 mm (1.4 in)
200919.8 mm (0.8 in)
201028.4 mm (1.1 in)
201143.4 mm (1.7 in)
201216.0 mm (0.6 in)
201336.8 mm (1.4 in)
201449.0 mm (1.9 in)
201567.8 mm (2.7 in)
201643.2 mm (1.7 in)
201755.9 mm (2.2 in)
201833.5 mm (1.3 in)
201945.7 mm (1.8 in)
202032.0 mm (1.3 in)
202128.7 mm (1.1 in)
202242.7 mm (1.7 in)
202340.6 mm (1.6 in)
202429.0 mm (1.1 in)
202535.6 mm (1.4 in)
202633.0 mm (1.3 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Dayton by year The wettest five days of the year at Dayton, 1951 to 2026. The record is 153.1 mm (6.0 in) in 2005, marked on the chart; the median year is 54.7 mm (2.2 in). 0501001502001960198020002020Record: 153.1 mm (6.0 in) in 2005
The wettest five days of the year at Dayton, 1951 to 2026. The record is 153.1 mm (6.0 in) in 2005, marked on the chart; the median year is 54.7 mm (2.2 in).
Wettest five days (Rx5day) at Dayton by year
YearWettest five days (Rx5day)
195160.4 mm (2.4 in)
195272.2 mm (2.8 in)
195340.7 mm (1.6 in)
195426.0 mm (1.0 in)
195529.0 mm (1.1 in)
195671.6 mm (2.8 in)
195789.6 mm (3.5 in)
195892.3 mm (3.6 in)
199135.1 mm (1.4 in)
199263.5 mm (2.5 in)
199365.5 mm (2.6 in)
199448.8 mm (1.9 in)
199551.1 mm (2.0 in)
199671.7 mm (2.8 in)
199776.1 mm (3.0 in)
199837.8 mm (1.5 in)
199947.5 mm (1.9 in)
2000106.4 mm (4.2 in)
200121.8 mm (0.9 in)
200226.2 mm (1.0 in)
200355.6 mm (2.2 in)
200453.8 mm (2.1 in)
2005153.1 mm (6.0 in)
20060.0 mm (0.00 in)
200772.9 mm (2.9 in)
200878.3 mm (3.1 in)
200941.4 mm (1.6 in)
201049.2 mm (1.9 in)
2011114.8 mm (4.5 in)
201224.9 mm (1.0 in)
201356.9 mm (2.2 in)
201451.5 mm (2.0 in)
201590.6 mm (3.6 in)
201676.3 mm (3.0 in)
201793.0 mm (3.7 in)
201863.2 mm (2.5 in)
201973.1 mm (2.9 in)
202048.6 mm (1.9 in)
202144.9 mm (1.8 in)
202250.8 mm (2.0 in)
202367.6 mm (2.7 in)
202450.8 mm (2.0 in)
202538.1 mm (1.5 in)
202635.3 mm (1.4 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Dayton by year The longest dry spell of the year at Dayton, 1951 to 2026. The record is 47 days in 2007, marked on the chart; the median year is 26 days. 10203040501960198020002020Record: 47 days in 2007
The longest dry spell of the year at Dayton, 1951 to 2026. The record is 47 days in 2007, marked on the chart; the median year is 26 days.
Longest dry spell (CDD) at Dayton by year
YearLongest dry spell (CDD)
195117 days
195229 days
195333 days
195423 days
195524 days
195634 days
195723 days
195815 days
199117 days
199236 days
199322 days
199422 days
199524 days
199623 days
199730 days
199838 days
199929 days
200024 days
200140 days
200223 days
200320 days
200420 days
200521 days
200620 days
200747 days
200838 days
200922 days
201017 days
201120 days
201238 days
201327 days
201427 days
201530 days
201627 days
201729 days
201833 days
201921 days
202046 days
202134 days
202218 days
202333 days
202434 days
202539 days
202624 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

30 years, 1952 to 2024

A day with at least 34.3 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 101.5 mm (4.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Dayton: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years34.3 mm (1.4 in)
5 years49.7 mm (2.0 in)
10 years60.9 mm (2.4 in)
25 years76.3 mm (3.0 in)
50 years88.5 mm (3.5 in)Longer than the 30 years of record
100 years101.5 mm (4.0 in)Longer than the 30 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, 30 years of values from 1952 to 2024.

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: 101.6 mm (4.0 in) in 2000; 68.3 mm (2.7 in) in 1997; 67.8 mm (2.7 in) in 2015.

Download the Data

  • Data for Dayton standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Dayton 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 (2026-10-12).