Westhaven Threshold Days by Year (USC00049560)

16 fixed thresholds counted per year at Westhaven (USC00049560): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Westhaven Thresholds

Westhaven: days with 10 mm (0.39 in) or more of precipitation in 71 years, most in 1941 with 16.
Westhaven: days with 25 mm (0.98 in) or more of precipitation in 31 years, most in 1969 with 4.
Westhaven: days with a maximum temperature at or above 30 C (86 F) in 16 years, most in 1931 with 180.
Westhaven: days with a maximum temperature at or above 35 C (95 F) in 16 years, most in 1931 with 111.
16 fixed thresholds have at least one qualifying day at Westhaven.

Days at or above 30 C (86 F)

16 years with a qualifying day

Days per year at Westhaven with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 180 in 1931.

Days at or above 30 C (86 F) per year at Westhaven
Year	Days	Decade average
1927	148	145.5
1929	143	145.5
1930	145	146.5
1931	180	146.5
1933	132	146.5
1934	140	146.5
1935	134	146.5
1937	146	146.5
1938	145	146.5
1939	150	146.5
1940	147	127.2
1941	104	127.2
1943	132	127.2
1944	128	127.2
1946	124	127.2
1947	128	127.2

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

First to last qualifying date each year at Westhaven
Year	First date	Last date
1927	1927-04-21	1927-11-04
1929	1929-03-04	1929-11-05
1930	1930-02-17	1930-11-11
1931	1931-04-04	1931-11-14
1933	1933-04-02	1933-10-23
1934	1934-04-06	1934-10-27
1935	1935-04-26	1935-10-10
1937	1937-04-20	1937-10-26
1938	1938-05-08	1938-10-26
1939	1939-03-17	1939-10-31
1940	1940-04-11	1940-10-19
1941	1941-05-07	1941-10-18
1943	1943-05-01	1943-10-16
1944	1944-04-02	1944-10-28
1946	1946-04-16	1946-09-30
1947	1947-04-13	1947-10-05

Every Fixed Threshold

Fixed thresholds at Westhaven
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	16	180	1931	128
35 C (95 F): Days	16	111	1931	76
40 C (104 F): Days	16	68	1931	6
45 C (113 F): Days	8	18	1931	1
50 C (122 F): Days	1	1	1931	1
90 F (32.2 C): Days	16	156	1931	116
100 F (37.8 C): Days	16	82	1931	36
110 F (43.3 C): Days	14	35	1931	2
120 F (48.9 C): Days	1	5	1931	5
0 C (32 F): Ice days (max	1	1	1946	1
0 C (32 F): Frost days (min	12	70	1946	39
20 C (68 F): Tropical nights (min	11	40	1939	11
25 C (77 F): Days with min	7	5	1933	1
10 mm (0.39 in): Days with 10 mm or more rain	71	16	1941	10
25 mm (0.98 in): Days with 25 mm or more rain	31	4	1969	2
50 mm (1.97 in): Days with 50 mm or more rain	3	1	1978	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1927.

Download the Data

Data for Westhaven 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).

Westhaven Threshold Days by Year (USC00049560)

Key Facts for Westhaven Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related