White Rock Threshold Days by Year (USC00037772)

16 fixed thresholds counted per year at White Rock (USC00037772): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for White Rock Thresholds

White Rock: days with 10 mm (0.39 in) or more of precipitation in 31 years, most in 1949 with 56.
White Rock: days with 25 mm (0.98 in) or more of precipitation in 31 years, most in 1951 with 26.
White Rock: days with 50 mm (1.97 in) or more of precipitation in 30 years, most in 1945 with 13.
White Rock: nights with a minimum temperature at or below 0 C (32 F) in 26 years, most in 1960 with 101.
16 fixed thresholds have at least one qualifying day at White Rock.

Days at or above 30 C (86 F)

25 years with a qualifying day

Days per year at White Rock with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 91 in 1954.

Days at or above 30 C (86 F) per year at White Rock
Year	Days	Decade average
1939	70	70
1940	29	45.1
1941	47	45.1
1942	32	45.1
1943	70	45.1
1944	50	45.1
1945	36	45.1
1946	58	45.1
1947	66	45.1
1948	35	45.1
1949	28	45.1
1950	4	47.8
1951	41	47.8
1953	76	47.8
1954	91	47.8
1955	53	47.8
1956	69	47.8
1957	37	47.8
1958	37	47.8
1959	22	47.8
1960	55	45.6
1961	8	45.6
1962	41	45.6
1963	80	45.6
1964	44	45.6

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

First to last qualifying date each year at White Rock
Year	First date	Last date
1939	1939-06-16	1939-10-07
1940	1940-06-19	1940-09-20
1941	1941-06-23	1941-09-19
1942	1942-06-02	1942-09-14
1943	1943-05-02	1943-09-16
1944	1944-05-26	1944-09-21
1945	1945-07-09	1945-09-09
1946	1946-04-01	1946-09-11
1947	1947-05-04	1947-10-18
1948	1948-06-05	1948-09-22
1949	1949-06-22	1949-09-07
1950	1950-06-12	1950-08-15
1951	1951-05-30	1951-09-04
1953	1953-05-23	1953-10-11
1954	1954-06-11	1954-09-29
1955	1955-06-21	1955-09-22
1956	1956-06-20	1956-10-06
1957	1957-06-29	1957-08-29
1958	1958-06-05	1958-09-08
1959	1959-06-17	1959-09-02
1960	1960-04-06	1960-10-10
1961	1961-07-19	1961-08-11
1962	1962-06-17	1962-09-14
1963	1963-06-07	1963-10-14
1964	1964-06-10	1964-09-02

Every Fixed Threshold

Fixed thresholds at White Rock
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	25	91	1954	44
35 C (95 F): Days	16	41	1954	12
40 C (104 F): Days	3	5	1954	5
90 F (32.2 C): Days	23	72	1954	26
100 F (37.8 C): Days	7	14	1947	1
0 C (32 F): Ice days (max	25	25	1960	6
0 C (32 F): Frost days (min	26	101	1960	69
-10 C (14 F): Days with min	26	24	1963	8
-20 C (-4 F): Days with min	9	4	1963	2
20 C (68 F): Tropical nights (min	26	88	1954	28
25 C (77 F): Days with min	9	8	1954	1
10 mm (0.39 in): Days with 10 mm or more rain	31	56	1949	38
25 mm (0.98 in): Days with 25 mm or more rain	31	26	1951	13
50 mm (1.97 in): Days with 50 mm or more rain	30	13	1945	6
100 mm (3.94 in): Days with 100 mm or more rain	10	2	1945	1
10 cm (3.9 in): Days with 10 cm or more snowfall	10	5	1958	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1939.

Download the Data

Data for White Rock 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).

White Rock Threshold Days by Year (USC00037772)

Key Facts for White Rock Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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