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

Charleston NAS Threshold Days by Year (USW00013758)

13 fixed thresholds counted per year at Charleston NAS (USW00013758): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Charleston NAS Thresholds

  • Charleston NAS: days with a maximum temperature at or above 30 C (86 F) in 6 years, most in 2025 with 99.
  • Charleston NAS: days with a maximum temperature at or above 90 F (32.2 C) in 6 years, most in 2025 with 63.
  • Charleston NAS: nights with a minimum temperature at or below 0 C (32 F) in 6 years, most in 1977 with 28.
  • Charleston NAS: nights with a minimum temperature at or above 20 C (68 F) in 6 years, most in 1977 with 148.
  • 13 fixed thresholds have at least one qualifying day at Charleston NAS.
6 years with a qualifying day
Days at or above 30 C (86 F) per year at Charleston NAS Days per year at Charleston NAS with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 99 in 2025. 02550751001973: 981974: 611975: 871976: 491977: 952025: 99197319741975197619772025
Days per year at Charleston NAS with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 99 in 2025.
Days at or above 30 C (86 F) per year at Charleston NAS
YearDaysDecade average
19739878
19746178
19758778
19764978
19779578
20259999
First to last qualifying date each year at Charleston NAS For each year, a bar from the first to the last day at Charleston NAS meeting 30 C (86 F). 1973: 10 May 1973 to 5 October 19731974: 1 May 1974 to 29 September 19741975: 17 May 1975 to 23 September 19751976: 12 May 1976 to 28 September 19761977: 16 March 1977 to 2 October 19772025: 15 May 2025 to 8 October 2025197319741975197619772025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Charleston NAS meeting 30 C (86 F).
First to last qualifying date each year at Charleston NAS
YearFirst dateLast date
19731973-05-101973-10-05
19741974-05-011974-09-29
19751975-05-171975-09-23
19761976-05-121976-09-28
19771977-03-161977-10-02
20252025-05-152025-10-08

Every Fixed Threshold

Fixed thresholds at Charleston NAS
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days699202599
35 C (95 F): Days51619779
90 F (32.2 C): Days663202563
100 F (37.8 C): Days1119771
0 C (32 F): Ice days (max2119731
0 C (32 F): Frost days (min628197728
20 C (68 F): Tropical nights (min61481977121
25 C (77 F): Days with min651197725
10 mm (0.39 in): Days with 10 mm or more rain439197532
25 mm (0.98 in): Days with 25 mm or more rain417197411
50 mm (1.97 in): Days with 50 mm or more rain4519743
100 mm (3.94 in): Days with 100 mm or more rain1119761
10 cm (3.9 in): Days with 10 cm or more snowfall1119731

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1973.

Download the Data

  • Data for Charleston NAS 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).