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Built 2026-10-19 (19 October 2026)

Dismal Swamp Threshold Days by Year (USS0020H12S)

10 fixed thresholds counted per year at Dismal Swamp (USS0020H12S): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dismal Swamp Thresholds

  • Dismal Swamp: days with 10 mm (0.39 in) or more of precipitation in 46 years, most in 1983 with 81.
  • Dismal Swamp: days with 25 mm (0.98 in) or more of precipitation in 46 years, most in 1996 with 26.
  • Dismal Swamp: days with a maximum temperature at or below 0 C (32 F) in 36 years, most in 1998 with 94.
  • Dismal Swamp: days with 50 mm (1.97 in) or more of precipitation in 35 years, most in 1986 with 4.
  • 10 fixed thresholds have at least one qualifying day at Dismal Swamp.
12 years with a qualifying day
Days at or above 30 C (86 F) per year at Dismal Swamp Days per year at Dismal Swamp with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 6 in 2003. 02461992: 11994: 11996: 11998: 12001: 12002: 32003: 62005: 12006: 12007: 12018: 12021: 1199219962001200320062018
Days per year at Dismal Swamp with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 6 in 2003.
Days at or above 30 C (86 F) per year at Dismal Swamp
YearDaysDecade average
199211
199411
199611
199811
200112.2
200232.2
200362.2
200512.2
200612.2
200712.2
201811
202111
First to last qualifying date each year at Dismal Swamp For each year, a bar from the first to the last day at Dismal Swamp meeting 30 C (86 F). 1992: 11 August 1992 to 11 August 19921994: 21 July 1994 to 21 July 19941996: 10 August 1996 to 10 August 19961998: 2 September 1998 to 2 September 19982001: 8 August 2001 to 8 August 20012002: 10 July 2002 to 12 July 20022003: 20 July 2003 to 30 July 20032005: 5 August 2005 to 5 August 20052006: 22 July 2006 to 22 July 20062007: 5 July 2007 to 5 July 20072018: 9 August 2018 to 9 August 20182021: 29 June 2021 to 29 June 2021199219962001200320062018JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Dismal Swamp meeting 30 C (86 F).
First to last qualifying date each year at Dismal Swamp
YearFirst dateLast date
19921992-08-111992-08-11
19941994-07-211994-07-21
19961996-08-101996-08-10
19981998-09-021998-09-02
20012001-08-082001-08-08
20022002-07-102002-07-12
20032003-07-202003-07-30
20052005-08-052005-08-05
20062006-07-222006-07-22
20072007-07-052007-07-05
20182018-08-092018-08-09
20212021-06-292021-06-29

Every Fixed Threshold

Fixed thresholds at Dismal Swamp
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days12620031
90 F (32.2 C): Days3320021
0 C (32 F): Ice days (max3694199812
0 C (32 F): Frost days (min342451998113
-10 C (14 F): Days with min345219946
-20 C (-4 F): Days with min12820131
10 mm (0.39 in): Days with 10 mm or more rain4681198316
25 mm (0.98 in): Days with 25 mm or more rain462619963
50 mm (1.97 in): Days with 50 mm or more rain35419862
100 mm (3.94 in): Days with 100 mm or more rain2120041

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1992.

Download the Data

  • Data for Dismal Swamp 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 (2026-10-17).