Daily records
Page built 2026-10-19
Data as of 2025-12-31
Search
Built 2026-10-19 (19 October 2026)

Herndon 5S Threshold Days by Year (USC00153798)

5 fixed thresholds counted per year at Herndon 5S (USC00153798): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Herndon 5S Thresholds

  • Herndon 5S: days with 10 mm (0.39 in) or more of precipitation in 19 years, most in 2018 with 55.
  • Herndon 5S: days with 25 mm (0.98 in) or more of precipitation in 19 years, most in 1950 with 23.
  • Herndon 5S: days with 50 mm (1.97 in) or more of precipitation in 19 years, most in 2016 with 7.
  • Herndon 5S: days with 100 mm (3.94 in) or more of precipitation in 4 years, most in 2024 with 2.
  • 5 fixed thresholds have at least one qualifying day at Herndon 5S.
19 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Herndon 5S Days per year at Herndon 5S with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 55 in 2018. 02040601949: 421950: 501998: 391999: 372000: 342004: 502009: 502010: 332015: 532016: 542017: 412018: 552019: 482020: 502021: 482022: 362023: 362024: 462025: 401949199820002009201520172019202120232025
Days per year at Herndon 5S with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 55 in 2018.
Days with 10 mm (0.39 in) or more of precipitation per year at Herndon 5S
YearDaysDecade average
19494242
19505050
19983938
19993738
20003444.7
20045044.7
20095044.7
20103347.3
20155347.3
20165447.3
20174147.3
20185547.3
20194847.3
20205042.7
20214842.7
20223642.7
20233642.7
20244642.7
20254042.7
First to last qualifying date each year at Herndon 5S For each year, a bar from the first to the last day at Herndon 5S meeting 10 mm (0.39 in). 1949: 4 January 1949 to 12 November 19491950: 1 January 1950 to 6 December 19501998: 4 January 1998 to 21 December 19981999: 8 January 1999 to 13 December 19992000: 3 January 2000 to 15 December 20002004: 1 January 2004 to 23 December 20042009: 5 January 2009 to 24 December 20092010: 4 February 2010 to 31 December 20102015: 12 January 2015 to 29 December 20152016: 8 January 2016 to 27 December 20162017: 3 January 2017 to 23 December 20172018: 12 January 2018 to 31 December 20182019: 1 January 2019 to 30 December 20192020: 3 January 2020 to 31 December 20202021: 1 January 2021 to 17 December 20212022: 1 January 2022 to 15 December 20222023: 3 January 2023 to 10 December 20232024: 6 January 2024 to 29 December 20242025: 6 January 2025 to 19 December 20251949199920092016201920222025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Herndon 5S meeting 10 mm (0.39 in).
First to last qualifying date each year at Herndon 5S
YearFirst dateLast date
19491949-01-041949-11-12
19501950-01-011950-12-06
19981998-01-041998-12-21
19991999-01-081999-12-13
20002000-01-032000-12-15
20042004-01-012004-12-23
20092009-01-052009-12-24
20102010-02-042010-12-31
20152015-01-122015-12-29
20162016-01-082016-12-27
20172017-01-032017-12-23
20182018-01-122018-12-31
20192019-01-012019-12-30
20202020-01-032020-12-31
20212021-01-012021-12-17
20222022-01-012022-12-15
20232023-01-032023-12-10
20242024-01-062024-12-29
20252025-01-062025-12-19

Every Fixed Threshold

Fixed thresholds at Herndon 5S
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain1955201840
25 mm (0.98 in): Days with 25 mm or more rain1923195016
50 mm (1.97 in): Days with 50 mm or more rain19720167
100 mm (3.94 in): Days with 100 mm or more rain4220242
10 cm (3.9 in): Days with 10 cm or more snowfall2220042

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1949.

Download the Data

  • Data for Herndon 5S 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).