Charlestown 5 NNW Threshold Days by Year (USC00121425)

16 fixed thresholds counted per year at Charlestown 5 NNW (USC00121425): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Charlestown 5 NNW Thresholds

Charlestown 5 NNW: days with 10 mm (0.39 in) or more of precipitation in 18 years, most in 1990 with 50.
Charlestown 5 NNW: days with 25 mm (0.98 in) or more of precipitation in 18 years, most in 1984 with 20.
Charlestown 5 NNW: nights with a minimum temperature at or below 0 C (32 F) in 16 years, most in 1997 with 109.
Charlestown 5 NNW: nights with a minimum temperature at or below -10 C (14 F) in 16 years, most in 1963 with 30.
16 fixed thresholds have at least one qualifying day at Charlestown 5 NNW.

Days at or above 30 C (86 F)

15 years with a qualifying day

Days per year at Charlestown 5 NNW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 90 in 1991.

Days at or above 30 C (86 F) per year at Charlestown 5 NNW
Year	Days	Decade average
1963	63	65.3
1964	77	65.3
1966	73	65.3
1967	48	65.3
1971	63	63
1984	75	72.5
1986	75	72.5
1988	86	72.5
1989	54	72.5
1990	63	62.7
1991	90	62.7
1992	36	62.7
1993	70	62.7
1994	60	62.7
1997	57	62.7

For each year, a bar from the first to the last day at Charlestown 5 NNW meeting 30 C (86 F).

First to last qualifying date each year at Charlestown 5 NNW
Year	First date	Last date
1963	1963-04-18	1963-10-20
1964	1964-05-18	1964-09-21
1966	1966-05-08	1966-09-11
1967	1967-05-25	1967-09-20
1971	1971-06-03	1971-10-03
1984	1984-05-19	1984-10-16
1986	1986-04-25	1986-10-04
1988	1988-04-05	1988-09-14
1989	1989-04-26	1989-10-14
1990	1990-04-24	1990-09-08
1991	1991-05-15	1991-09-17
1992	1992-06-16	1992-09-10
1993	1993-05-28	1993-09-15
1994	1994-05-23	1994-09-16
1997	1997-06-19	1997-10-12

Every Fixed Threshold

Fixed thresholds at Charlestown 5 NNW
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	15	90	1991	57
35 C (95 F): Days	12	30	1988	3
90 F (32.2 C): Days	15	61	1964	27
100 F (37.8 C): Days	4	6	1988	1
0 C (32 F): Ice days (max	15	28	1963	11
0 C (32 F): Frost days (min	16	109	1997	109
-10 C (14 F): Days with min	16	30	1963	13
-20 C (-4 F): Days with min	8	7	1963	1
-30 C (-22 F): Days with min	1	1	1994	1
20 C (68 F): Tropical nights (min	16	63	1991	19
25 C (77 F): Days with min	11	6	1988	1
10 mm (0.39 in): Days with 10 mm or more rain	18	50	1990	22
25 mm (0.98 in): Days with 25 mm or more rain	18	20	1984	14
50 mm (1.97 in): Days with 50 mm or more rain	16	6	1992	4
100 mm (3.94 in): Days with 100 mm or more rain	3	2	1964	1
10 cm (3.9 in): Days with 10 cm or more snowfall	5	3	1964	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1963.

Download the Data

Data for Charlestown 5 NNW 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).

Charlestown 5 NNW Threshold Days by Year (USC00121425)

Key Facts for Charlestown 5 NNW Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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