St Williams Threshold Days by Year (CA006137399)

14 fixed thresholds counted per year at St Williams (CA006137399): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for St Williams Thresholds

St Williams: days with 10 cm (3.9 in) or more of snowfall in 28 years, most in 1970 with 8.
St Williams: days with 10 mm (0.39 in) or more of precipitation in 27 years, most in 1974 with 43.
St Williams: days with 25 mm (0.98 in) or more of precipitation in 27 years, most in 1955 with 9.
St Williams: days with a maximum temperature at or above 30 C (86 F) in 26 years, most in 1959 with 32.
14 fixed thresholds have at least one qualifying day at St Williams.

Days at or above 30 C (86 F)

26 years with a qualifying day

Days per year at St Williams with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 32 in 1959.

Days at or above 30 C (86 F) per year at St Williams
Year	Days	Decade average
1955	30	18.3
1956	9	18.3
1958	2	18.3
1959	32	18.3
1960	7	11.8
1961	8	11.8
1962	9	11.8
1963	16	11.8
1964	22	11.8
1965	10	11.8
1966	9	11.8
1967	9	11.8
1968	14	11.8
1969	14	11.8
1970	13	9.6
1971	13	9.6
1972	6	9.6
1973	18	9.6
1974	7	9.6
1975	10	9.6
1976	2	9.6
1977	13	9.6
1978	9	9.6
1979	5	9.6
1980	4	5
1981	6	5

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

First to last qualifying date each year at St Williams
Year	First date	Last date
1955	1955-06-06	1955-09-19
1956	1956-06-10	1956-07-28
1958	1958-07-15	1958-08-03
1959	1959-06-08	1959-09-09
1960	1960-07-12	1960-09-08
1961	1961-06-12	1961-09-13
1962	1962-05-15	1962-08-30
1963	1963-06-25	1963-07-28
1964	1964-06-09	1964-08-29
1965	1965-06-20	1965-09-22
1966	1966-06-23	1966-07-13
1967	1967-06-11	1967-07-09
1968	1968-06-07	1968-08-24
1969	1969-06-12	1969-08-31
1970	1970-06-10	1970-09-24
1971	1971-06-19	1971-09-08
1972	1972-07-12	1972-07-23
1973	1973-06-10	1973-09-04
1974	1974-06-09	1974-07-28
1975	1975-06-22	1975-08-03
1976	1976-06-07	1976-06-15
1977	1977-05-21	1977-09-05
1978	1978-05-27	1978-08-19
1979	1979-06-10	1979-07-16
1980	1980-06-23	1980-07-21
1981	1981-07-07	1981-07-18

Every Fixed Threshold

Fixed thresholds at St Williams
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	26	32	1959	6
35 C (95 F): Days	2	1	1971	1
90 F (32.2 C): Days	17	10	1955	1
0 C (32 F): Ice days (max	26	79	1960	45
0 C (32 F): Frost days (min	26	162	1972	132
-10 C (14 F): Days with min	26	56	1978	29
-20 C (-4 F): Days with min	24	12	1979	2
20 C (68 F): Tropical nights (min	26	20	1959	11
10 mm (0.39 in): Days with 10 mm or more rain	27	43	1974	33
25 mm (0.98 in): Days with 25 mm or more rain	27	9	1955	9
50 mm (1.97 in): Days with 50 mm or more rain	16	3	1968	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1977	1
10 cm (3.9 in): Days with 10 cm or more snowfall	28	8	1970	1
25 cm (9.8 in): Days with 25 cm or more snowfall	7	1	1958	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1955.

Download the Data

Data for St Williams 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

St Williams Threshold Days by Year (CA006137399)

Key Facts for St Williams Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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