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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Rock Creek Threshold Days by Year (USC00357250)

13 fixed thresholds counted per year at Rock Creek (USC00357250): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rock Creek Thresholds

  • Rock Creek: days with 10 mm (0.39 in) or more of precipitation in 85 years, most in 1941 with 21.
  • Rock Creek: days with 10 cm (3.9 in) or more of snowfall in 69 years, most in 1951 with 19.
  • Rock Creek: days with 25 mm (0.98 in) or more of precipitation in 49 years, most in 2009 with 4.
  • Rock Creek: days with 25 cm (9.8 in) or more of snowfall in 27 years, most in 1952 with 3.
  • 13 fixed thresholds have at least one qualifying day at Rock Creek.
18 years with a qualifying day
Days at or above 30 C (86 F) per year at Rock Creek Days per year at Rock Creek with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 18 in 1936. 051015201928: 81929: 61930: 61931: 151932: 11933: 131934: 91935: 81936: 181937: 51938: 91941: 61942: 151943: 51944: 71945: 161946: 111947: 12192819301932193419361938194219441946
Days per year at Rock Creek with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 18 in 1936.
Days at or above 30 C (86 F) per year at Rock Creek
YearDaysDecade average
192887
192967
193069.3
1931159.3
193219.3
1933139.3
193499.3
193589.3
1936189.3
193759.3
193899.3
1941610.3
19421510.3
1943510.3
1944710.3
19451610.3
19461110.3
19471210.3
First to last qualifying date each year at Rock Creek For each year, a bar from the first to the last day at Rock Creek meeting 30 C (86 F). 1928: 23 July 1928 to 9 August 19281929: 17 July 1929 to 30 August 19291930: 13 July 1930 to 8 August 19301931: 6 June 1931 to 23 August 19311932: 7 August 1932 to 7 August 19321933: 14 June 1933 to 17 August 19331934: 26 July 1934 to 4 September 19341935: 12 July 1935 to 10 September 19351936: 26 June 1936 to 29 August 19361937: 28 June 1937 to 4 August 19371938: 13 July 1938 to 24 July 19381941: 6 July 1941 to 15 August 19411942: 2 July 1942 to 24 August 19421943: 20 July 1943 to 31 July 19431944: 16 July 1944 to 11 September 19441945: 18 June 1945 to 1 September 19451946: 20 July 1946 to 20 August 19461947: 5 July 1947 to 4 September 1947192819311934193719421945JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rock Creek meeting 30 C (86 F).
First to last qualifying date each year at Rock Creek
YearFirst dateLast date
19281928-07-231928-08-09
19291929-07-171929-08-30
19301930-07-131930-08-08
19311931-06-061931-08-23
19321932-08-071932-08-07
19331933-06-141933-08-17
19341934-07-261934-09-04
19351935-07-121935-09-10
19361936-06-261936-08-29
19371937-06-281937-08-04
19381938-07-131938-07-24
19411941-07-061941-08-15
19421942-07-021942-08-24
19431943-07-201943-07-31
19441944-07-161944-09-11
19451945-06-181945-09-01
19461946-07-201946-08-20
19471947-07-051947-09-04

Every Fixed Threshold

Fixed thresholds at Rock Creek
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1818193612
35 C (95 F): Days2119311
90 F (32.2 C): Days13319282
0 C (32 F): Ice days (max1865194442
0 C (32 F): Frost days (min171721943146
-10 C (14 F): Days with min1745194416
-20 C (-4 F): Days with min9819371
20 C (68 F): Tropical nights (min7619281
10 mm (0.39 in): Days with 10 mm or more rain8521194117
25 mm (0.98 in): Days with 25 mm or more rain49420094
50 mm (1.97 in): Days with 50 mm or more rain5119211
10 cm (3.9 in): Days with 10 cm or more snowfall691919516
25 cm (9.8 in): Days with 25 cm or more snowfall27319521

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1928.

Download the Data

  • 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).