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Built 2026-10-14 (14 October 2026)

Rock Creek Weather Records (USS0010J18S)

Record envelope, standing records and threshold days for Rock Creek (USS0010J18S), Utah, United States, with 47 years of record.

Key Facts for Rock Creek

  • Rock Creek (USS0010J18S) is a weather station in Utah, United States at 40.55 latitude and -110.69 longitude, 2,405 m (7,889 ft) above sea level.
  • The station reports from 1980 to 2026, 47 years of record.
  • 1,464 records set at Rock Creek still stand.
  • Records are tracked for prcp: an element needs 30 years of data to be eligible.
  • Rock Creek set a daily record precipitation of 45.7 mm (1.8 in) on 18 September 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, 40.55 latitude, -110.69 longitude.
  • Elevation: 2,405 m (7,889 ft).
  • Period of record: 1980 to 2026, 47 years.
  • Eligible elements: prcp.

Daily Record Envelope and 2026

37 days at or beyond a record
Daily record high and record low at Rock Creek, with 2026 drawn through them The band shows the record high and record low for each calendar day at Rock Creek. The lines show the 2026 daily maximum and minimum. 37 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 Rock Creek. The lines show the 2026 daily maximum and minimum. 37 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Rock Creek, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan13.1 C (55.6 F)-27.1 C (-16.8 F)11.2 C (52.2 F)-17.1 C (1.2 F)
Feb16.1 C (61.0 F)-30.5 C (-22.9 F)11.6 C (52.9 F)-18.2 C (-0.8 F)
Mar21.9 C (71.4 F)-21.6 C (-6.9 F)21.9 C (71.4 F)-10.6 C (12.9 F)
Apr22.9 C (73.2 F)-18.9 C (-2.0 F)18.3 C (64.9 F)-9.9 C (14.2 F)
May25.6 C (78.1 F)-11.0 C (12.2 F)24.7 C (76.5 F)-7.2 C (19.0 F)
Jun30.7 C (87.3 F)-2.8 C (27.0 F)26.9 C (80.4 F)0.5 C (32.9 F)
Jul31.4 C (88.5 F)1.5 C (34.7 F)31.4 C (88.5 F)3.7 C (38.7 F)
Aug31.9 C (89.4 F)-0.8 C (30.6 F)30.9 C (87.6 F)5.4 C (41.7 F)
Sep30.0 C (86.0 F)-4.2 C (24.4 F)24.2 C (75.6 F)0.7 C (33.3 F)
Oct25.2 C (77.4 F)-19.8 C (-3.6 F)22.9 C (73.2 F)3.6 C (38.5 F)
Nov17.8 C (64.0 F)-23.0 C (-9.4 F)n/an/a
Dec13.1 C (55.6 F)-27.1 C (-16.8 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Rock Creek by the year they were set 1,464 records at Rock Creek still stand. 2020 holds the most, with 86. 02550751002005: 202006: 742007: 652008: 782009: 542010: 652011: 692012: 542013: 782014: 542015: 832016: 622017: 682018: 642019: 572020: 862021: 802022: 832023: 612024: 562025: 732026: 8020052008201120142017202020232026
1,464 records at Rock Creek still stand. 2020 holds the most, with 86.
Standing records at Rock Creek by the year they were set
Year setStanding records
200520
200674
200765
200878
200954
201065
201169
201254
201378
201454
201583
201662
201768
201864
201957
202086
202180
202283
202361
202456
202573
202680

All-Time Record Progression

1 new records
When Rock Creek set new all-time records 1 all-time records were set at Rock Creek between 18 August 2021 and 18 August 2021. Each dot is a new record. Record daily precipitation18 August 2021: Record daily precipitation 91.4 mm (3.6 in)
1 all-time records were set at Rock Creek between 18 August 2021 and 18 August 2021. Each dot is a new record.
When Rock Creek set new all-time records
DateKindDetail
2021-08-18Record daily precipitationRecord daily precipitation 91.4 mm (3.6 in)

Wettest Day of Each Month

Aug: 91.4 mm (3.6 in)
Record daily precipitation for each month at Rock Creek The wettest day on record for each calendar month at Rock Creek. The most was 91.4 mm (3.6 in) on 18 August 2021. 0255075100 Jan: 33.0 mm (1.3 in), 9 January 2017 Jan Feb: 68.6 mm (2.7 in), 9 February 1993 Feb Mar: 40.6 mm (1.6 in), 11 March 1995 Mar Apr: 30.5 mm (1.2 in), 8 April 2013 Apr May: 38.1 mm (1.5 in), 23 May 2019 May Jun: 48.3 mm (1.9 in), 27 June 1996 Jun Jul: 50.8 mm (2.0 in), 28 July 1985 Jul Aug: 91.4 mm (3.6 in), 18 August 2021 Aug Sep: 61.0 mm (2.4 in), 27 September 2014 Sep Oct: 50.8 mm (2.0 in), 20 October 2004 Oct Nov: 33.0 mm (1.3 in), 13 November 1985 Nov Dec: 48.3 mm (1.9 in), 19 December 2010 Dec
The wettest day on record for each calendar month at Rock Creek. The most was 91.4 mm (3.6 in) on 18 August 2021.
Record daily precipitation for each month at Rock Creek
MonthRecord daily precipitation (mm)Date
Jan33.0 mm (1.3 in)9 January 2017
Feb68.6 mm (2.7 in)9 February 1993
Mar40.6 mm (1.6 in)11 March 1995
Apr30.5 mm (1.2 in)8 April 2013
May38.1 mm (1.5 in)23 May 2019
Jun48.3 mm (1.9 in)27 June 1996
Jul50.8 mm (2.0 in)28 July 1985
Aug91.4 mm (3.6 in)18 August 2021
Sep61.0 mm (2.4 in)27 September 2014
Oct50.8 mm (2.0 in)20 October 2004
Nov33.0 mm (1.3 in)13 November 1985
Dec48.3 mm (1.9 in)19 December 2010

Period of Record Coverage

2005 to 2026
Days with data per year at Rock Creek 22 years of record at Rock Creek, 2005 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 2005, 2026. 2005: 158 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: 365 of 366 days2013: 365 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 366 of 366 days2017: 363 of 365 days2018: 365 of 365 days2019: 364 of 365 days2020: 366 of 366 days2021: 363 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 366 of 366 days2025: 364 of 365 days2026: 282 of 365 days20052010201520202025
22 years of record at Rock Creek, 2005 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 2005, 2026.
Days with data per year at Rock Creek
YearDays with dataShare of yearComplete
200515843%No
2006365100%Yes
2007365100%Yes
2008366100%Yes
2009365100%Yes
2010365100%Yes
2011365100%Yes
2012365100%Yes
2013365100%Yes
2014365100%Yes
2015365100%Yes
2016366100%Yes
201736399%Yes
2018365100%Yes
2019364100%Yes
2020366100%Yes
202136399%Yes
2022365100%Yes
2023365100%Yes
2024366100%Yes
2025364100%Yes
202628277%No

Latest Records

20
Latest records at Rock Creek
DateStationRecordValueBeat old record byOld record stoodSignificance
18 September 2026Rock Creek, USdaily rain (Provisional)45.7 mm (1.8 in)22.8 mm (0.9 in)36 years43 of 100 (Notable)
16 September 2026Rock Creek, USdaily rain (Tie, Provisional)15.2 mm (0.6 in)tie32 years3 of 100 (Routine)
29 August 2026Rock Creek, USdaily rain (Provisional)25.4 mm (1.0 in)5.1 mm (0.20 in)23 years17 of 100 (Routine)
28 August 2026Rock Creek, USdaily rain (Provisional)10.2 mm (0.4 in)2.6 mm (0.10 in)43 years19 of 100 (Routine)
26 May 2026Rock Creek, USdaily rain (Tie)12.7 mm (0.5 in)tie39 years3 of 100 (Routine)
5 May 2026Rock Creek, USdaily rain27.9 mm (1.1 in)12.7 mm (0.5 in)11 years32 of 100 (Routine)
19 November 2025Rock Creek, USdaily rain (Tie)7.6 mm (0.30 in)tie35 years3 of 100 (Routine)
16 November 2025Rock Creek, USdaily rain12.7 mm (0.5 in)2.5 mm (0.10 in)8 years10 of 100 (Routine)
3 November 2025Rock Creek, USdaily rain (Tie)2.5 mm (0.10 in)tie22 years2 of 100 (Routine)
11 October 2025Rock Creek, USdaily rain (Tie)22.9 mm (0.9 in)tie44 years4 of 100 (Routine)
18 October 2024Rock Creek, USdaily rain12.7 mm (0.5 in)2.5 mm (0.10 in)38 years18 of 100 (Routine)
17 October 2024Rock Creek, USdaily rain17.8 mm (0.7 in)2.6 mm (0.10 in)38 years18 of 100 (Routine)
25 May 2024Rock Creek, USdaily rain15.2 mm (0.6 in)2.5 mm (0.10 in)28 years17 of 100 (Routine)
2 March 2024Rock Creek, USdaily rain (Tie)10.2 mm (0.4 in)tie35 years3 of 100 (Routine)
26 February 2024Rock Creek, USdaily rain (Tie)12.7 mm (0.5 in)tie40 years4 of 100 (Routine)
6 February 2024Rock Creek, USdaily rain15.2 mm (0.6 in)7.6 mm (0.30 in)38 years20 of 100 (Routine)
5 February 2024Rock Creek, USdaily rain22.9 mm (0.9 in)15.3 mm (0.6 in)12 years20 of 100 (Routine)
2 February 2024Rock Creek, USdaily rain (Tie)10.2 mm (0.4 in)tie26 years3 of 100 (Routine)
16 November 2023Rock Creek, USdaily rain (Tie)10.2 mm (0.4 in)tie5 years1 of 100 (Routine)
1 October 2023Rock Creek, USdaily rain (Tie)17.8 mm (0.7 in)tie38 years3 of 100 (Routine)

Climate Trend

20 complete years, 2006 to 2025
Annual mean temperature at Rock Creek as warming stripes, 2006 to 2025 One stripe for each of 20 complete years at Rock Creek, 2006 to 2025. Blue stripes are years cooler than the station's own mean of 5.1 C (41.1 F); red stripes are warmer. The coolest year was 2019, at 3.9 C (39.1 F), and the warmest was 2025, at 6.4 C (43.5 F). The strongest colour marks a difference of 1.4 C (2.5 F). 2006: 4.6 C, -0.5 C from the station mean2007: 5.4 C, +0.3 C from the station mean2008: 4.0 C, -1.1 C from the station mean2009: 4.4 C, -0.7 C from the station mean2010: 4.3 C, -0.8 C from the station mean2011: 4.0 C, -1.1 C from the station mean2012: 5.9 C, +0.8 C from the station mean2013: 4.7 C, -0.4 C from the station mean2014: 5.4 C, +0.3 C from the station mean2015: 5.8 C, +0.8 C from the station mean2016: 5.5 C, +0.5 C from the station mean2017: 5.8 C, +0.8 C from the station mean2018: 5.5 C, +0.4 C from the station mean2019: 3.9 C, -1.2 C from the station mean2020: 5.4 C, +0.3 C from the station mean2021: 5.7 C, +0.6 C from the station mean2022: 4.9 C, -0.2 C from the station mean2023: 4.3 C, -0.8 C from the station mean2024: 5.7 C, +0.6 C from the station mean2025: 6.4 C, +1.3 C from the station mean2006200820102012201420162018202020222024
One stripe for each of 20 complete years at Rock Creek, 2006 to 2025. Blue stripes are years cooler than the station's own mean of 5.1 C (41.1 F); red stripes are warmer. The coolest year was 2019, at 3.9 C (39.1 F), and the warmest was 2025, at 6.4 C (43.5 F). The strongest colour marks a difference of 1.4 C (2.5 F).
Annual mean temperature at Rock Creek as warming stripes, 2006 to 2025
YearAnnual mean temperatureDifference from the station mean
20064.6 C-0.51 C
20075.4 C+0.35 C
20084.0 C-1.08 C
20094.4 C-0.66 C
20104.3 C-0.81 C
20114.0 C-1.11 C
20125.9 C+0.79 C
20134.7 C-0.42 C
20145.4 C+0.33 C
20155.8 C+0.76 C
20165.5 C+0.46 C
20175.8 C+0.77 C
20185.5 C+0.41 C
20193.9 C-1.15 C
20205.4 C+0.31 C
20215.7 C+0.62 C
20224.9 C-0.17 C
20234.3 C-0.80 C
20245.7 C+0.65 C
20256.4 C+1.31 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

1980 to 2026
Yearly extremes at Rock Creek: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)31.9 C (89.4 F)202030.5 C (86.8 F)22
Coldest night (TNn)-30.5 C (-22.9 F)2011-23.5 C (-10.3 F)22
Wettest day (Rx1day)91.4 mm (3.6 in)202130.5 mm (1.2 in)47
Wettest five days (Rx5day)129.5 mm (5.1 in)198653.5 mm (2.1 in)47
Longest dry spell (CDD)52 days198227 days47

Hottest day (TXx)

Hottest day (TXx) at Rock Creek by year The hottest day of the year at Rock Creek, 1980 to 2026. The record is 31.9 C (89.4 F) in 2020, marked on the chart; the median year is 30.5 C (86.8 F). 282930313219801990200020102020Record: 31.9 C (89.4 F) in 2020
The hottest day of the year at Rock Creek, 1980 to 2026. The record is 31.9 C (89.4 F) in 2020, marked on the chart; the median year is 30.5 C (86.8 F).
Hottest day (TXx) at Rock Creek by year
YearHottest day (TXx)
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
2003n/a
2004n/a
200528.5 C (83.3 F)
200631.2 C (88.2 F)
200730.8 C (87.4 F)
200829.4 C (84.9 F)
200929.4 C (84.9 F)
201030.4 C (86.7 F)
201128.5 C (83.3 F)
201229.2 C (84.6 F)
201330.9 C (87.6 F)
201429.8 C (85.6 F)
201529.8 C (85.6 F)
201630.5 C (86.9 F)
201729.9 C (85.8 F)
201831.3 C (88.3 F)
201930.2 C (86.4 F)
202031.9 C (89.4 F)
202131.1 C (88.0 F)
202230.0 C (86.0 F)
202331.1 C (88.0 F)
202431.7 C (89.1 F)
202531.4 C (88.5 F)
202631.4 C (88.5 F)

Coldest night (TNn)

Coldest night (TNn) at Rock Creek by year The coldest night of the year at Rock Creek, 1980 to 2026. The record is -30.5 C (-22.9 F) in 2011, marked on the chart; the median year is -23.5 C (-10.3 F). -35-30-25-20-1519801990200020102020Record: -30.5 C (-22.9 F) in 2011
The coldest night of the year at Rock Creek, 1980 to 2026. The record is -30.5 C (-22.9 F) in 2011, marked on the chart; the median year is -23.5 C (-10.3 F).
Coldest night (TNn) at Rock Creek by year
YearColdest night (TNn)
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
2003n/a
2004n/a
2005-25.7 C (-14.3 F)
2006-23.0 C (-9.4 F)
2007-25.8 C (-14.4 F)
2008-24.9 C (-12.8 F)
2009-23.7 C (-10.7 F)
2010-26.0 C (-14.8 F)
2011-30.5 C (-22.9 F)
2012-21.1 C (-6.0 F)
2013-27.1 C (-16.8 F)
2014-23.9 C (-11.0 F)
2015-21.7 C (-7.1 F)
2016-22.7 C (-8.9 F)
2017-23.1 C (-9.6 F)
2018-23.3 C (-9.9 F)
2019-25.2 C (-13.4 F)
2020-21.8 C (-7.2 F)
2021-21.1 C (-6.0 F)
2022-22.4 C (-8.3 F)
2023-25.1 C (-13.2 F)
2024-19.1 C (-2.4 F)
2025-23.7 C (-10.7 F)
2026-18.2 C (-0.8 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Rock Creek by year The wettest day of the year at Rock Creek, 1980 to 2026. The record is 91.4 mm (3.6 in) in 2021, marked on the chart; the median year is 30.5 mm (1.2 in). 02040608010019801990200020102020Record: 91.4 mm (3.6 in) in 2021
The wettest day of the year at Rock Creek, 1980 to 2026. The record is 91.4 mm (3.6 in) in 2021, marked on the chart; the median year is 30.5 mm (1.2 in).
Wettest day (Rx1day) at Rock Creek by year
YearWettest day (Rx1day)
198015.2 mm (0.6 in)
198122.9 mm (0.9 in)
198255.9 mm (2.2 in)
198322.9 mm (0.9 in)
198422.9 mm (0.9 in)
198550.8 mm (2.0 in)
198633.0 mm (1.3 in)
198727.9 mm (1.1 in)
198830.5 mm (1.2 in)
198933.0 mm (1.3 in)
199025.4 mm (1.0 in)
199135.6 mm (1.4 in)
199217.8 mm (0.7 in)
199368.6 mm (2.7 in)
199427.9 mm (1.1 in)
199540.6 mm (1.6 in)
199648.3 mm (1.9 in)
199727.9 mm (1.1 in)
199820.3 mm (0.8 in)
199930.5 mm (1.2 in)
200030.5 mm (1.2 in)
200120.3 mm (0.8 in)
200238.1 mm (1.5 in)
200320.3 mm (0.8 in)
200450.8 mm (2.0 in)
200527.9 mm (1.1 in)
200625.4 mm (1.0 in)
200738.1 mm (1.5 in)
200822.9 mm (0.9 in)
200927.9 mm (1.1 in)
201048.3 mm (1.9 in)
201127.9 mm (1.1 in)
201230.5 mm (1.2 in)
201338.1 mm (1.5 in)
201461.0 mm (2.4 in)
201517.8 mm (0.7 in)
201658.4 mm (2.3 in)
201733.0 mm (1.3 in)
201830.5 mm (1.2 in)
201938.1 mm (1.5 in)
202043.2 mm (1.7 in)
202191.4 mm (3.6 in)
202222.9 mm (0.9 in)
202330.5 mm (1.2 in)
202422.9 mm (0.9 in)
202522.9 mm (0.9 in)
202645.7 mm (1.8 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Rock Creek by year The wettest five days of the year at Rock Creek, 1980 to 2026. The record is 129.5 mm (5.1 in) in 1986, marked on the chart; the median year is 53.5 mm (2.1 in). 05010015019801990200020102020Record: 129.5 mm (5.1 in) in 1986
The wettest five days of the year at Rock Creek, 1980 to 2026. The record is 129.5 mm (5.1 in) in 1986, marked on the chart; the median year is 53.5 mm (2.1 in).
Wettest five days (Rx5day) at Rock Creek by year
YearWettest five days (Rx5day)
198028.0 mm (1.1 in)
198155.9 mm (2.2 in)
1982114.3 mm (4.5 in)
198345.7 mm (1.8 in)
198430.5 mm (1.2 in)
198581.3 mm (3.2 in)
1986129.5 mm (5.1 in)
198745.7 mm (1.8 in)
198840.6 mm (1.6 in)
198953.4 mm (2.1 in)
199050.7 mm (2.0 in)
199150.7 mm (2.0 in)
199235.5 mm (1.4 in)
199381.3 mm (3.2 in)
199453.3 mm (2.1 in)
199550.8 mm (2.0 in)
199661.0 mm (2.4 in)
199748.2 mm (1.9 in)
199843.2 mm (1.7 in)
199966.0 mm (2.6 in)
200055.9 mm (2.2 in)
200138.0 mm (1.5 in)
200276.3 mm (3.0 in)
200345.7 mm (1.8 in)
2004109.2 mm (4.3 in)
200599.0 mm (3.9 in)
200668.6 mm (2.7 in)
200766.0 mm (2.6 in)
200845.8 mm (1.8 in)
200938.1 mm (1.5 in)
2010124.5 mm (4.9 in)
201166.0 mm (2.6 in)
201238.1 mm (1.5 in)
201353.5 mm (2.1 in)
2014104.1 mm (4.1 in)
201548.2 mm (1.9 in)
201681.3 mm (3.2 in)
201783.8 mm (3.3 in)
201840.6 mm (1.6 in)
201981.3 mm (3.2 in)
202060.9 mm (2.4 in)
2021127.0 mm (5.0 in)
202248.3 mm (1.9 in)
202373.7 mm (2.9 in)
202453.3 mm (2.1 in)
202553.3 mm (2.1 in)
202668.5 mm (2.7 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Rock Creek by year The longest dry spell of the year at Rock Creek, 1980 to 2026. The record is 52 days in 1982, marked on the chart; the median year is 27 days. 10203040506019801990200020102020Record: 52 days in 1982
The longest dry spell of the year at Rock Creek, 1980 to 2026. The record is 52 days in 1982, marked on the chart; the median year is 27 days.
Longest dry spell (CDD) at Rock Creek by year
YearLongest dry spell (CDD)
198021 days
198125 days
198252 days
198329 days
198427 days
198520 days
198652 days
198725 days
198828 days
198927 days
199021 days
199125 days
199239 days
199331 days
199439 days
199520 days
199628 days
199727 days
199834 days
199937 days
200033 days
200139 days
200234 days
200327 days
200441 days
200524 days
200633 days
200720 days
200828 days
200918 days
201016 days
201120 days
201247 days
201336 days
201444 days
201520 days
201620 days
201729 days
201844 days
201926 days
202044 days
202124 days
202226 days
202317 days
202422 days
202545 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 Rock Creek falls on 8 June and the median first autumn frost on 20 September, which leaves a median of 111 days between them.

Frost dates and growing season at Rock Creek
MeasureMedian, all yearsEarliest periodRecent period (2006 to 2025)Recent against earliestFitted trend
Last spring frost8 Junen/a8 Junen/an/a
First autumn frost20 Septembern/a20 Septembern/an/a
Growing days111 daysn/a111 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

45 years, 1981 to 2025

A day with at least 30.6 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 96.8 mm (3.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Rock Creek: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years30.6 mm (1.2 in)
5 years42.7 mm (1.7 in)
10 years52.5 mm (2.1 in)
25 years67.6 mm (2.7 in)
50 years81.1 mm (3.2 in)Longer than the 45 years of record
100 years96.8 mm (3.8 in)Longer than the 45 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, 45 years of values from 1981 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: 91.4 mm (3.6 in) in 2021; 68.6 mm (2.7 in) in 1993; 61.0 mm (2.4 in) in 2014.

Download the Data

  • Data for Rock Creek standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Rock Creek 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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-13).