Charleston Threshold Days by Year (USP00381549)

14 fixed thresholds counted per year at Charleston (USP00381549): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Charleston Thresholds

Charleston: days with a maximum temperature at or above 30 C (86 F) in 34 years, most in 1849 with 97.
Charleston: nights with a minimum temperature at or below 0 C (32 F) in 34 years, most in 1856 with 28.
Charleston: nights with a minimum temperature at or above 20 C (68 F) in 34 years, most in 1884 with 144.
Charleston: nights with a minimum temperature at or above 25 C (77 F) in 34 years, most in 1846 with 61.
14 fixed thresholds have at least one qualifying day at Charleston.

Days at or above 30 C (86 F)

34 years with a qualifying day

Days per year at Charleston with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 97 in 1849.

Days at or above 30 C (86 F) per year at Charleston
Year	Days	Decade average
1845	60	47.8
1846	31	47.8
1847	18	47.8
1848	33	47.8
1849	97	47.8
1850	95	83.5
1851	91	83.5
1852	92	83.5
1853	92	83.5
1854	95	83.5
1855	97	83.5
1856	95	83.5
1857	58	83.5
1858	59	83.5
1859	61	83.5
1860	73	65.8
1861	73	65.8
1862	58	65.8
1863	59	65.8
1877	89	82.7
1878	88	82.7
1879	71	82.7
1880	82	67.9
1882	84	67.9
1883	78	67.9
1884	64	67.9
1885	56	67.9
1886	67	67.9
1887	59	67.9
1888	64	67.9
1889	57	67.9
1890	72	66.7
1891	71	66.7
1892	57	66.7

For each year, a bar from the first to the last day at Charleston meeting 30 C (86 F).

First to last qualifying date each year at Charleston
Year	First date	Last date
1845	1845-06-08	1845-09-09
1846	1846-06-01	1846-09-18
1847	1847-06-13	1847-08-24
1848	1848-05-07	1848-09-16
1849	1849-04-08	1849-10-06
1850	1850-05-28	1850-09-28
1851	1851-05-13	1851-09-14
1852	1852-05-01	1852-10-13
1853	1853-04-21	1853-09-28
1854	1854-03-16	1854-10-14
1855	1855-04-19	1855-10-01
1856	1856-05-03	1856-09-21
1857	1857-05-10	1857-09-20
1858	1858-05-26	1858-09-05
1859	1859-04-13	1859-09-16
1860	1860-04-21	1860-10-08
1861	1861-05-11	1861-09-21
1862	1862-05-20	1862-09-19
1863	1863-05-14	1863-09-14
1877	1877-05-20	1877-09-26
1878	1878-04-26	1878-10-01
1879	1879-05-01	1879-10-10
1880	1880-04-17	1880-09-08
1882	1882-04-09	1882-09-22
1883	1883-05-15	1883-10-14
1884	1884-04-29	1884-10-13
1885	1885-05-24	1885-09-16
1886	1886-05-12	1886-10-15
1887	1887-05-18	1887-10-03
1888	1888-04-16	1888-09-18
1889	1889-05-07	1889-10-01
1890	1890-04-14	1890-10-12
1891	1891-05-02	1891-10-05
1892	1892-05-27	1892-09-26

Every Fixed Threshold

Fixed thresholds at Charleston
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	34	97	1849	57
35 C (95 F): Days	27	19	1856	1
40 C (104 F): Days	1	1	1879	1
90 F (32.2 C): Days	33	57	1850	25
100 F (37.8 C): Days	7	2	1877	1
0 C (32 F): Ice days (max	8	4	1886	1
0 C (32 F): Frost days (min	34	28	1856	15
-10 C (14 F): Days with min	4	4	1886	4
20 C (68 F): Tropical nights (min	34	144	1884	126
25 C (77 F): Days with min	34	61	1846	14
10 mm (0.39 in): Days with 10 mm or more rain	30	48	1873	40
25 mm (0.98 in): Days with 25 mm or more rain	30	23	1874	13
50 mm (1.97 in): Days with 50 mm or more rain	29	9	1872	3
100 mm (3.94 in): Days with 100 mm or more rain	13	2	1845	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1845.

Download the Data

Data for Charleston 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Charleston Threshold Days by Year (USP00381549)

Key Facts for Charleston Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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