Boyes Threshold Days by Year (USC00241040)

19 fixed thresholds counted per year at Boyes (USC00241040): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Boyes Thresholds

Boyes: days with a maximum temperature at or above 30 C (86 F) in 20 years, most in 1952 with 61.
Boyes: days with a maximum temperature at or above 35 C (95 F) in 20 years, most in 1961 with 24.
Boyes: days with a maximum temperature at or above 90 F (32.2 C) in 20 years, most in 1961 with 54.
Boyes: days with a maximum temperature at or below 0 C (32 F) in 20 years, most in 1969 with 68.
19 fixed thresholds have at least one qualifying day at Boyes.

Days at or above 30 C (86 F)

20 years with a qualifying day

Days per year at Boyes with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 61 in 1952.

Days at or above 30 C (86 F) per year at Boyes
Year	Days	Decade average
1951	33	49.7
1952	61	49.7
1953	51	49.7
1954	57	49.7
1955	52	49.7
1956	51	49.7
1957	42	49.7
1958	40	49.7
1959	60	49.7
1960	53	41.9
1961	61	41.9
1962	28	41.9
1963	53	41.9
1964	46	41.9
1965	23	41.9
1966	52	41.9
1967	40	41.9
1968	24	41.9
1969	39	41.9
1970	53	53

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

First to last qualifying date each year at Boyes
Year	First date	Last date
1951	1951-05-23	1951-08-23
1952	1952-04-26	1952-09-27
1953	1953-06-01	1953-10-11
1954	1954-05-19	1954-09-26
1955	1955-05-01	1955-10-10
1956	1956-06-04	1956-09-26
1957	1957-06-03	1957-10-02
1958	1958-05-21	1958-09-23
1959	1959-06-03	1959-09-14
1960	1960-05-12	1960-10-06
1961	1961-05-10	1961-09-16
1962	1962-04-24	1962-09-06
1963	1963-06-19	1963-10-05
1964	1964-05-17	1964-09-08
1965	1965-07-07	1965-08-28
1966	1966-05-04	1966-09-23
1967	1967-05-23	1967-09-25
1968	1968-06-02	1968-09-14
1969	1969-05-25	1969-09-20
1970	1970-05-17	1970-09-08

Every Fixed Threshold

Fixed thresholds at Boyes
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	20	61	1952	53
35 C (95 F): Days	20	24	1961	11
40 C (104 F): Days	7	3	1954	1
90 F (32.2 C): Days	20	54	1961	39
100 F (37.8 C): Days	14	8	1954	1
0 C (32 F): Ice days (max	20	68	1969	50
0 C (32 F): Frost days (min	20	211	1965	199
-10 C (14 F): Days with min	20	107	1955	75
-20 C (-4 F): Days with min	20	41	1951	20
-30 C (-22 F): Days with min	19	11	1963	3
-40 C (-40 F): Days with min	2	1	1954	1
20 C (68 F): Tropical nights (min	13	7	1966	1
25 C (77 F): Days with min	1	1	1960	1
10 mm (0.39 in): Days with 10 mm or more rain	20	17	1957	9
25 mm (0.98 in): Days with 25 mm or more rain	16	3	1953	3
50 mm (1.97 in): Days with 50 mm or more rain	1	1	1953	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1953	1
10 cm (3.9 in): Days with 10 cm or more snowfall	6	2	1966	2
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	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 1951.

Download the Data

Data for Boyes 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).

Boyes Threshold Days by Year (USC00241040)

Key Facts for Boyes Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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