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Mosby Mtn. Weather Records (USS0009J05S)

Record envelope, standing records and threshold days for Mosby Mtn. (USS0009J05S), Utah, United States, with 49 years of record.

Key Facts for Mosby Mtn.

  • Mosby Mtn. (USS0009J05S) is a weather station in Utah, United States at 40.61 latitude and -109.89 longitude, 2,899 m (9,510 ft) above sea level.
  • The station reports from 1978 to 2026, 49 years of record.
  • 1,464 records set at Mosby Mtn. still stand.
  • Records are tracked for prcp: an element needs 30 years of data to be eligible.
  • Mosby Mtn. set a monthly record daily precipitation of 63.5 mm (2.5 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: Utah, United States, 40.61 latitude, -109.89 longitude.
  • Elevation: 2,899 m (9,510 ft).
  • Period of record: 1978 to 2026, 49 years.
  • Eligible elements: prcp.

Daily Record Envelope and 2026

21 days at or beyond a record
Daily record high and record low at Mosby Mtn., with 2026 drawn through them The band shows the record high and record low for each calendar day at Mosby Mtn.. The lines show the 2026 daily maximum and minimum. 21 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 Mosby Mtn.. The lines show the 2026 daily maximum and minimum. 21 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Mosby Mtn., with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan12.3 C (54.1 F)-30.3 C (-22.5 F)7.7 C (45.9 F)-21.6 C (-6.9 F)
Feb12.3 C (54.1 F)-28.9 C (-20.0 F)8.3 C (46.9 F)-21.5 C (-6.7 F)
Mar17.1 C (62.8 F)-24.1 C (-11.4 F)17.0 C (62.6 F)-16.0 C (3.2 F)
Apr18.8 C (65.8 F)-21.5 C (-6.7 F)14.3 C (57.7 F)-14.9 C (5.2 F)
May23.0 C (73.4 F)-16.6 C (2.1 F)21.4 C (70.5 F)-9.0 C (15.8 F)
Jun28.3 C (82.9 F)-8.3 C (17.1 F)25.8 C (78.4 F)-3.1 C (26.4 F)
Jul29.3 C (84.7 F)-2.2 C (28.0 F)28.9 C (84.0 F)0.3 C (32.5 F)
Aug29.6 C (85.3 F)-3.6 C (25.5 F)27.2 C (81.0 F)2.8 C (37.0 F)
Sep27.4 C (81.3 F)-9.0 C (15.8 F)19.8 C (67.6 F)-1.8 C (28.8 F)
Oct21.4 C (70.5 F)-22.0 C (-7.6 F)17.5 C (63.5 F)-3.8 C (25.2 F)
Nov14.4 C (57.9 F)-29.2 C (-20.6 F)n/an/a
Dec12.0 C (53.6 F)-31.0 C (-23.8 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Mosby Mtn. by the year they were set 1,464 records at Mosby Mtn. still stand. 2008 holds the most, with 85. 02550751002003: 252004: 642005: 502006: 632007: 622008: 852009: 622010: 582011: 522012: 642013: 672014: 512015: 762016: 542017: 632018: 542019: 572020: 782021: 772022: 762023: 452024: 462025: 682026: 6720032006200920122015201820212024
1,464 records at Mosby Mtn. still stand. 2008 holds the most, with 85.
Standing records at Mosby Mtn. by the year they were set
Year setStanding records
200325
200464
200550
200663
200762
200885
200962
201058
201152
201264
201367
201451
201576
201654
201763
201854
201957
202078
202177
202276
202345
202446
202568
202667

Wettest Day of Each Month

Aug: 68.6 mm (2.7 in)
Record daily precipitation for each month at Mosby Mtn. The wettest day on record for each calendar month at Mosby Mtn.. The most was 68.6 mm (2.7 in) on 4 August 1997. 020406080 Jan: 50.8 mm (2.0 in), 9 January 2005 Jan Feb: 43.2 mm (1.7 in), 17 February 1986 Feb Mar: 43.2 mm (1.7 in), 6 March 2025 Mar Apr: 43.2 mm (1.7 in), 25 April 1991 Apr May: 43.2 mm (1.7 in), 18 May 2011 May Jun: 43.2 mm (1.7 in), 6 June 2020 Jun Jul: 45.7 mm (1.8 in), 19 July 1995 Jul Aug: 68.6 mm (2.7 in), 4 August 1997 Aug Sep: 58.4 mm (2.3 in), 7 September 1991 Sep Oct: 53.3 mm (2.1 in), 3 October 1994 Oct Nov: 53.3 mm (2.1 in), 30 November 1982 Nov Dec: 58.4 mm (2.3 in), 19 December 2010 Dec
The wettest day on record for each calendar month at Mosby Mtn.. The most was 68.6 mm (2.7 in) on 4 August 1997.
Record daily precipitation for each month at Mosby Mtn.
MonthRecord daily precipitation (mm)Date
Jan50.8 mm (2.0 in)9 January 2005
Feb43.2 mm (1.7 in)17 February 1986
Mar43.2 mm (1.7 in)6 March 2025
Apr43.2 mm (1.7 in)25 April 1991
May43.2 mm (1.7 in)18 May 2011
Jun43.2 mm (1.7 in)6 June 2020
Jul45.7 mm (1.8 in)19 July 1995
Aug68.6 mm (2.7 in)4 August 1997
Sep58.4 mm (2.3 in)7 September 1991
Oct53.3 mm (2.1 in)3 October 1994
Nov53.3 mm (2.1 in)30 November 1982
Dec58.4 mm (2.3 in)19 December 2010

Period of Record Coverage

2003 to 2026
Days with data per year at Mosby Mtn. 24 years of record at Mosby Mtn., 2003 to 2026. 3 years have data for under 90 percent of days and are left out of rankings: 2003, 2017, 2026. 2003: 134 of 365 days2004: 348 of 366 days2005: 365 of 365 days2006: 365 of 365 days2007: 365 of 365 days2008: 366 of 366 days2009: 365 of 365 days2010: 365 of 365 days2011: 365 of 365 days2012: 366 of 366 days2013: 365 of 365 days2014: 364 of 365 days2015: 364 of 365 days2016: 366 of 366 days2017: 325 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 365 of 366 days2021: 363 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 366 of 366 days2025: 359 of 365 days2026: 286 of 365 days20052010201520202025
24 years of record at Mosby Mtn., 2003 to 2026. 3 years have data for under 90 percent of days and are left out of rankings: 2003, 2017, 2026.
Days with data per year at Mosby Mtn.
YearDays with dataShare of yearComplete
200313437%No
200434895%Yes
2005365100%Yes
2006365100%Yes
2007365100%Yes
2008366100%Yes
2009365100%Yes
2010365100%Yes
2011365100%Yes
2012366100%Yes
2013365100%Yes
2014364100%Yes
2015364100%Yes
2016366100%Yes
201732589%No
2018365100%Yes
2019365100%Yes
2020365100%Yes
202136399%Yes
2022365100%Yes
2023365100%Yes
2024366100%Yes
202535998%Yes
202628678%No

Latest Records

20
Latest records at Mosby Mtn.
DateStationRecordValueBeat old record byOld record stoodSignificance
11 October 2026Mosby Mtn., USmonthly rain (Provisional)63.5 mm (2.5 in)10.2 mm (0.4 in)32 years34 of 100 (Routine)
30 August 2026Mosby Mtn., USdaily rain (Provisional)22.9 mm (0.9 in)7.7 mm (0.30 in)11 years20 of 100 (Routine)
29 August 2026Mosby Mtn., USdaily rain (Provisional)27.9 mm (1.1 in)7.6 mm (0.30 in)40 years29 of 100 (Routine)
28 August 2026Mosby Mtn., USdaily rain (Tie, Provisional)7.6 mm (0.30 in)tie16 years2 of 100 (Routine)
30 May 2026Mosby Mtn., USdaily rain33.0 mm (1.3 in)15.2 mm (0.6 in)44 years38 of 100 (Notable)
17 May 2026Mosby Mtn., USdaily rain (Tie)22.9 mm (0.9 in)tie15 years2 of 100 (Routine)
26 April 2026Mosby Mtn., USdaily rain35.6 mm (1.4 in)15.3 mm (0.6 in)32 years39 of 100 (Notable)
1 April 2026Mosby Mtn., USdaily rain33.0 mm (1.3 in)7.6 mm (0.30 in)40 years28 of 100 (Routine)
16 November 2025Mosby Mtn., USdaily rain17.8 mm (0.7 in)7.6 mm (0.30 in)31 years20 of 100 (Routine)
27 August 2025Mosby Mtn., USdaily rain (Tie)12.7 mm (0.5 in)tie43 years4 of 100 (Routine)
5 May 2025Mosby Mtn., USdaily rain33.0 mm (1.3 in)20.3 mm (0.8 in)32 years42 of 100 (Notable)
6 March 2025Mosby Mtn., USmonthly rain43.2 mm (1.7 in)2.6 mm (0.10 in)26 years26 of 100 (Routine)
13 February 2025Mosby Mtn., USdaily rain27.9 mm (1.1 in)2.5 mm (0.10 in)41 years19 of 100 (Routine)
18 October 2024Mosby Mtn., USdaily rain20.3 mm (0.8 in)7.6 mm (0.30 in)20 years18 of 100 (Routine)
18 July 2024Mosby Mtn., USdaily rain10.2 mm (0.4 in)5.1 mm (0.20 in)34 years20 of 100 (Routine)
7 February 2024Mosby Mtn., USdaily rain27.9 mm (1.1 in)5.0 mm (0.20 in)29 years19 of 100 (Routine)
6 February 2024Mosby Mtn., USdaily rain17.8 mm (0.7 in)10.2 mm (0.4 in)9 years20 of 100 (Routine)
30 September 2023Mosby Mtn., USdaily rain (Tie)10.2 mm (0.4 in)tie8 years1 of 100 (Routine)
4 September 2023Mosby Mtn., USdaily rain (Tie)15.2 mm (0.6 in)tie30 years3 of 100 (Routine)
15 June 2023Mosby Mtn., USdaily rain17.8 mm (0.7 in)7.6 mm (0.30 in)8 years18 of 100 (Routine)

Climate Trend

20 complete years, 2005 to 2025
Annual mean temperature at Mosby Mtn. as warming stripes, 2005 to 2025 One stripe for each of 20 complete years at Mosby Mtn., 2005 to 2025. Blue stripes are years cooler than the station's own mean of 2.1 C (35.8 F); red stripes are warmer. The coolest year was 2011, at 1.1 C (33.9 F), and the warmest was 2015, at 2.8 C (37.0 F). The strongest colour marks a difference of 1.1 C (2.0 F). 2005: 2.2 C, +0.1 C from the station mean2006: 1.9 C, -0.2 C from the station mean2007: 2.6 C, +0.5 C from the station mean2008: 1.1 C, -1.0 C from the station mean2009: 1.5 C, -0.6 C from the station mean2010: 1.6 C, -0.5 C from the station mean2011: 1.1 C, -1.0 C from the station mean2012: 2.8 C, +0.7 C from the station mean2013: 1.8 C, -0.3 C from the station mean2014: 2.3 C, +0.2 C from the station mean2015: 2.8 C, +0.7 C from the station mean2016: 2.5 C, +0.4 C from the station mean2018: 2.5 C, +0.4 C from the station mean2019: 1.2 C, -0.9 C from the station mean2020: 2.4 C, +0.3 C from the station mean2021: 2.6 C, +0.5 C from the station mean2022: 1.9 C, -0.2 C from the station mean2023: 1.5 C, -0.6 C from the station mean2024: 2.6 C, +0.5 C from the station mean2025: 2.8 C, +0.7 C from the station mean2005200820102012201420162018202020222024
One stripe for each of 20 complete years at Mosby Mtn., 2005 to 2025. Blue stripes are years cooler than the station's own mean of 2.1 C (35.8 F); red stripes are warmer. The coolest year was 2011, at 1.1 C (33.9 F), and the warmest was 2015, at 2.8 C (37.0 F). The strongest colour marks a difference of 1.1 C (2.0 F).
Annual mean temperature at Mosby Mtn. as warming stripes, 2005 to 2025
YearAnnual mean temperatureDifference from the station mean
20052.2 C+0.09 C
20061.9 C-0.20 C
20072.6 C+0.55 C
20081.1 C-0.95 C
20091.5 C-0.57 C
20101.6 C-0.50 C
20111.1 C-1.03 C
20122.8 C+0.66 C
20131.8 C-0.25 C
20142.3 C+0.18 C
20152.8 C+0.70 C
20162.5 C+0.43 C
20182.5 C+0.45 C
20191.2 C-0.85 C
20202.4 C+0.33 C
20212.6 C+0.53 C
20221.9 C-0.18 C
20231.5 C-0.56 C
20242.6 C+0.52 C
20252.8 C+0.68 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

1978 to 2026
Yearly extremes at Mosby Mtn.: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)29.6 C (85.3 F)202027.5 C (81.5 F)24
Coldest night (TNn)-31.0 C (-23.8 F)2013-26.1 C (-15.1 F)24
Wettest day (Rx1day)68.6 mm (2.7 in)199738.1 mm (1.5 in)49
Wettest five days (Rx5day)157.4 mm (6.2 in)201071.1 mm (2.8 in)49
Longest dry spell (CDD)99 days202023 days49

Hottest day (TXx)

Hottest day (TXx) at Mosby Mtn. by year The hottest day of the year at Mosby Mtn., 1978 to 2026. The record is 29.6 C (85.3 F) in 2020, marked on the chart; the median year is 27.5 C (81.5 F). 25262728293019801990200020102020Record: 29.6 C (85.3 F) in 2020
The hottest day of the year at Mosby Mtn., 1978 to 2026. The record is 29.6 C (85.3 F) in 2020, marked on the chart; the median year is 27.5 C (81.5 F).
Hottest day (TXx) at Mosby Mtn. by year
YearHottest day (TXx)
1978n/a
1979n/a
1980n/a
1981n/a
1982n/a
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/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
200325.6 C (78.1 F)
200425.8 C (78.4 F)
200528.3 C (82.9 F)
200629.2 C (84.6 F)
200727.9 C (82.2 F)
200826.9 C (80.4 F)
200926.4 C (79.5 F)
201026.7 C (80.1 F)
201125.6 C (78.1 F)
201226.4 C (79.5 F)
201328.8 C (83.8 F)
201427.1 C (80.8 F)
201528.2 C (82.8 F)
201627.6 C (81.7 F)
201727.1 C (80.8 F)
201828.6 C (83.5 F)
201926.4 C (79.5 F)
202029.6 C (85.3 F)
202129.3 C (84.7 F)
202227.4 C (81.3 F)
202329.2 C (84.6 F)
202428.9 C (84.0 F)
202527.0 C (80.6 F)
202628.9 C (84.0 F)

Coldest night (TNn)

Coldest night (TNn) at Mosby Mtn. by year The coldest night of the year at Mosby Mtn., 1978 to 2026. The record is -31.0 C (-23.8 F) in 2013, marked on the chart; the median year is -26.1 C (-15.1 F). -32.5-30-27.5-25-22.5-2019801990200020102020Record: -31.0 C (-23.8 F) in 2013
The coldest night of the year at Mosby Mtn., 1978 to 2026. The record is -31.0 C (-23.8 F) in 2013, marked on the chart; the median year is -26.1 C (-15.1 F).
Coldest night (TNn) at Mosby Mtn. by year
YearColdest night (TNn)
1978n/a
1979n/a
1980n/a
1981n/a
1982n/a
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/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
2003-26.0 C (-14.8 F)
2004-26.5 C (-15.7 F)
2005-30.0 C (-22.0 F)
2006-26.3 C (-15.3 F)
2007-27.9 C (-18.2 F)
2008-27.7 C (-17.9 F)
2009-28.6 C (-19.5 F)
2010-30.0 C (-22.0 F)
2011-29.6 C (-21.3 F)
2012-27.2 C (-17.0 F)
2013-31.0 C (-23.8 F)
2014-25.4 C (-13.7 F)
2015-24.9 C (-12.8 F)
2016-25.0 C (-13.0 F)
2017-26.6 C (-15.9 F)
2018-26.1 C (-15.0 F)
2019-25.2 C (-13.4 F)
2020-24.7 C (-12.5 F)
2021-23.8 C (-10.8 F)
2022-25.5 C (-13.9 F)
2023-24.7 C (-12.5 F)
2024-23.9 C (-11.0 F)
2025-26.2 C (-15.2 F)
2026-21.6 C (-6.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Mosby Mtn. by year The wettest day of the year at Mosby Mtn., 1978 to 2026. The record is 68.6 mm (2.7 in) in 1997, marked on the chart; the median year is 38.1 mm (1.5 in). 2040608019801990200020102020Record: 68.6 mm (2.7 in) in 1997
The wettest day of the year at Mosby Mtn., 1978 to 2026. The record is 68.6 mm (2.7 in) in 1997, marked on the chart; the median year is 38.1 mm (1.5 in).
Wettest day (Rx1day) at Mosby Mtn. by year
YearWettest day (Rx1day)
197827.9 mm (1.1 in)
197925.4 mm (1.0 in)
198038.1 mm (1.5 in)
198138.1 mm (1.5 in)
198253.3 mm (2.1 in)
198340.6 mm (1.6 in)
198427.9 mm (1.1 in)
198550.8 mm (2.0 in)
198643.2 mm (1.7 in)
198733.0 mm (1.3 in)
198833.0 mm (1.3 in)
198935.6 mm (1.4 in)
199045.7 mm (1.8 in)
199158.4 mm (2.3 in)
199227.9 mm (1.1 in)
199330.5 mm (1.2 in)
199453.3 mm (2.1 in)
199545.7 mm (1.8 in)
199645.7 mm (1.8 in)
199768.6 mm (2.7 in)
199840.6 mm (1.6 in)
199943.2 mm (1.7 in)
200035.6 mm (1.4 in)
200143.2 mm (1.7 in)
200225.4 mm (1.0 in)
200335.6 mm (1.4 in)
200443.2 mm (1.7 in)
200550.8 mm (2.0 in)
200633.0 mm (1.3 in)
200733.0 mm (1.3 in)
200838.1 mm (1.5 in)
200930.5 mm (1.2 in)
201058.4 mm (2.3 in)
201150.8 mm (2.0 in)
201238.1 mm (1.5 in)
201322.9 mm (0.9 in)
201443.2 mm (1.7 in)
201525.4 mm (1.0 in)
201655.9 mm (2.2 in)
201738.1 mm (1.5 in)
201822.9 mm (0.9 in)
201940.6 mm (1.6 in)
202043.2 mm (1.7 in)
202127.9 mm (1.1 in)
202220.3 mm (0.8 in)
202345.7 mm (1.8 in)
202427.9 mm (1.1 in)
202543.2 mm (1.7 in)
202663.5 mm (2.5 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Mosby Mtn. by year The wettest five days of the year at Mosby Mtn., 1978 to 2026. The record is 157.4 mm (6.2 in) in 2010, marked on the chart; the median year is 71.1 mm (2.8 in). 05010015020019801990200020102020Record: 157.4 mm (6.2 in) in 2010
The wettest five days of the year at Mosby Mtn., 1978 to 2026. The record is 157.4 mm (6.2 in) in 2010, marked on the chart; the median year is 71.1 mm (2.8 in).
Wettest five days (Rx5day) at Mosby Mtn. by year
YearWettest five days (Rx5day)
197863.5 mm (2.5 in)
197940.6 mm (1.6 in)
1980111.7 mm (4.4 in)
198168.6 mm (2.7 in)
198294.0 mm (3.7 in)
198368.6 mm (2.7 in)
198455.9 mm (2.2 in)
198571.1 mm (2.8 in)
1986149.8 mm (5.9 in)
198748.3 mm (1.9 in)
198850.8 mm (2.0 in)
198953.4 mm (2.1 in)
199073.7 mm (2.9 in)
199188.9 mm (3.5 in)
199255.8 mm (2.2 in)
199376.1 mm (3.0 in)
199496.5 mm (3.8 in)
199573.7 mm (2.9 in)
199668.5 mm (2.7 in)
1997104.2 mm (4.1 in)
199876.1 mm (3.0 in)
199983.9 mm (3.3 in)
200060.9 mm (2.4 in)
200196.5 mm (3.8 in)
200253.4 mm (2.1 in)
200376.1 mm (3.0 in)
2004134.7 mm (5.3 in)
2005144.7 mm (5.7 in)
200665.9 mm (2.6 in)
200743.1 mm (1.7 in)
200850.7 mm (2.0 in)
200945.7 mm (1.8 in)
2010157.4 mm (6.2 in)
2011106.6 mm (4.2 in)
201255.9 mm (2.2 in)
201340.7 mm (1.6 in)
201483.9 mm (3.3 in)
201553.4 mm (2.1 in)
201688.9 mm (3.5 in)
201773.7 mm (2.9 in)
201868.7 mm (2.7 in)
2019104.1 mm (4.1 in)
202071.1 mm (2.8 in)
202166.0 mm (2.6 in)
202235.5 mm (1.4 in)
202381.2 mm (3.2 in)
202466.0 mm (2.6 in)
202553.3 mm (2.1 in)
2026104.1 mm (4.1 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Mosby Mtn. by year The longest dry spell of the year at Mosby Mtn., 1978 to 2026. The record is 99 days in 2020, marked on the chart; the median year is 23 days. 025507510019801990200020102020Record: 99 days in 2020
The longest dry spell of the year at Mosby Mtn., 1978 to 2026. The record is 99 days in 2020, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Mosby Mtn. by year
YearLongest dry spell (CDD)
197819 days
197930 days
198040 days
198141 days
198222 days
198323 days
198424 days
198540 days
198632 days
198725 days
198822 days
198928 days
199015 days
199130 days
199228 days
199323 days
199421 days
199544 days
199619 days
199727 days
199825 days
199932 days
200023 days
200125 days
200219 days
200322 days
200422 days
200521 days
200616 days
200744 days
200840 days
200917 days
201017 days
201119 days
201218 days
201314 days
201420 days
201526 days
201619 days
201735 days
201825 days
201923 days
202099 days
202116 days
202237 days
202315 days
202417 days
202523 days
202625 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

20 years with a frost

Across 20 years with a frost, the median last spring frost at Mosby Mtn. falls on 21 June and the median first autumn frost on 3 September, which leaves a median of 72 days between them.

Frost dates and growing season at Mosby Mtn.
MeasureMedian, all yearsEarliest periodRecent period (2005 to 2025)Recent against earliestFitted trend
Last spring frost21 Junen/a21 Junen/an/a
First autumn frost3 Septembern/a3 Septembern/an/a
Growing days72 daysn/a72 daysn/an/a

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

47 years, 1979 to 2025

A day with at least 38.7 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 66.9 mm (2.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Mosby Mtn.: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years38.7 mm (1.5 in)
5 years48.4 mm (1.9 in)
10 years53.9 mm (2.1 in)
25 years59.8 mm (2.4 in)
50 years63.6 mm (2.5 in)Longer than the 47 years of record
100 years66.9 mm (2.6 in)Longer than the 47 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, 47 years of values from 1979 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: 68.6 mm (2.7 in) in 1997; 58.4 mm (2.3 in) in 1991; 58.4 mm (2.3 in) in 2010.

Download the Data

  • Data for Mosby Mtn. standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Mosby 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-17).