Hempstead Threshold Days by Year (USC00414080)

15 fixed thresholds counted per year at Hempstead (USC00414080): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hempstead Thresholds

Hempstead: days with 10 mm (0.39 in) or more of precipitation in 58 years, most in 1973 with 46.
Hempstead: days with 25 mm (0.98 in) or more of precipitation in 58 years, most in 1973 with 27.
Hempstead: days with 50 mm (1.97 in) or more of precipitation in 54 years, most in 1968 with 11.
Hempstead: days with 100 mm (3.94 in) or more of precipitation in 21 years, most in 1940 with 3.
15 fixed thresholds have at least one qualifying day at Hempstead.

Days at or above 30 C (86 F)

14 years with a qualifying day

Days per year at Hempstead with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 159 in 1972.

Days at or above 30 C (86 F) per year at Hempstead
Year	Days	Decade average
1964	135	135.7
1965	134	135.7
1966	128	135.7
1967	148	135.7
1968	122	135.7
1969	147	135.7
1970	131	138.6
1971	146	138.6
1972	159	138.6
1973	138	138.6
1974	133	138.6
1975	132	138.6
1976	117	138.6
1977	153	138.6

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

First to last qualifying date each year at Hempstead
Year	First date	Last date
1964	1964-04-23	1964-10-03
1965	1965-04-19	1965-10-18
1966	1966-04-04	1966-10-15
1967	1967-03-13	1967-11-27
1968	1968-04-28	1968-10-31
1969	1969-05-21	1969-11-12
1970	1970-04-23	1970-10-27
1971	1971-03-14	1971-11-03
1972	1972-03-18	1972-10-31
1973	1973-05-09	1973-11-19
1974	1974-03-12	1974-10-30
1975	1975-04-25	1975-11-10
1976	1976-03-21	1976-10-04
1977	1977-05-02	1977-11-21

Every Fixed Threshold

Fixed thresholds at Hempstead
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	14	159	1972	153
35 C (95 F): Days	14	69	1977	69
40 C (104 F): Days	1	1	1969	1
90 F (32.2 C): Days	14	124	1969	116
100 F (37.8 C): Days	8	22	1969	7
0 C (32 F): Ice days (max	5	1	1965	1
0 C (32 F): Frost days (min	13	38	1966	27
-10 C (14 F): Days with min	2	1	1966	1
20 C (68 F): Tropical nights (min	13	135	1971	124
25 C (77 F): Days with min	6	6	1969	1
10 mm (0.39 in): Days with 10 mm or more rain	58	46	1973	33
25 mm (0.98 in): Days with 25 mm or more rain	58	27	1973	15
50 mm (1.97 in): Days with 50 mm or more rain	54	11	1968	4
100 mm (3.94 in): Days with 100 mm or more rain	21	3	1940	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1940	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1964.

Download the Data

Data for Hempstead 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).

Hempstead Threshold Days by Year (USC00414080)

Key Facts for Hempstead Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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