Cornwall Threshold Days by Year (CA006101874)

17 fixed thresholds counted per year at Cornwall (CA006101874): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Cornwall Thresholds

Cornwall: nights with a minimum temperature at or below 0 C (32 F) in 32 years, most in 1956 with 188.
Cornwall: nights with a minimum temperature at or below -10 C (14 F) in 32 years, most in 1978 with 85.
Cornwall: nights with a minimum temperature at or below -20 C (-4 F) in 32 years, most in 1968 with 28.
Cornwall: nights with a minimum temperature at or above 20 C (68 F) in 31 years, most in 1973 with 23.
17 fixed thresholds have at least one qualifying day at Cornwall.

Days at or above 30 C (86 F)

30 years with a qualifying day

Days per year at Cornwall with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 43 in 1955.

Days at or above 30 C (86 F) per year at Cornwall
Year	Days	Decade average
1951	4	17
1952	22	17
1953	17	17
1955	43	17
1956	5	17
1957	6	17
1959	22	17
1960	11	9.8
1961	9	9.8
1962	6	9.8
1963	18	9.8
1965	9	9.8
1966	13	9.8
1967	4	9.8
1968	7	9.8
1969	11	9.8
1970	13	12.2
1971	13	12.2
1972	5	12.2
1973	15	12.2
1974	2	12.2
1975	24	12.2
1976	8	12.2
1977	15	12.2
1978	15	12.2
1979	12	12.2
1980	7	10.5
1981	5	10.5
1982	8	10.5
1983	22	10.5

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

First to last qualifying date each year at Cornwall
Year	First date	Last date
1951	1951-07-09	1951-09-14
1952	1952-06-17	1952-08-29
1953	1953-06-20	1953-09-04
1955	1955-06-06	1955-09-19
1956	1956-06-12	1956-08-09
1957	1957-06-17	1957-08-03
1959	1959-06-09	1959-09-10
1960	1960-07-12	1960-09-09
1961	1961-05-15	1961-09-11
1962	1962-05-17	1962-08-31
1963	1963-06-04	1963-07-29
1965	1965-06-07	1965-09-22
1966	1966-05-24	1966-08-09
1967	1967-06-03	1967-08-17
1968	1968-07-01	1968-07-22
1969	1969-06-12	1969-08-31
1970	1970-06-02	1970-08-20
1971	1971-05-19	1971-08-19
1972	1972-06-15	1972-07-21
1973	1973-06-27	1973-09-05
1974	1974-06-10	1974-07-14
1975	1975-05-20	1975-08-26
1976	1976-06-10	1976-08-21
1977	1977-05-17	1977-08-29
1978	1978-05-27	1978-08-16
1979	1979-06-10	1979-07-30
1980	1980-06-24	1980-08-07
1981	1981-06-16	1981-07-10
1982	1982-05-07	1982-07-22
1983	1983-06-12	1983-09-20

Every Fixed Threshold

Fixed thresholds at Cornwall
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	30	43	1955	22
35 C (95 F): Days	3	7	1955	2
90 F (32.2 C): Days	21	20	1955	1
0 C (32 F): Ice days (max	30	96	1963	71
0 C (32 F): Frost days (min	32	188	1956	156
-10 C (14 F): Days with min	32	85	1978	47
-20 C (-4 F): Days with min	32	28	1968	11
-30 C (-22 F): Days with min	13	3	1951	2
-40 C (-40 F): Days with min	1	1	1957	1
20 C (68 F): Tropical nights (min	31	23	1973	17
10 mm (0.39 in): Days with 10 mm or more rain	26	48	1972	37
25 mm (0.98 in): Days with 25 mm or more rain	26	9	1951	6
50 mm (1.97 in): Days with 50 mm or more rain	12	2	1969	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1979	1
10 cm (3.9 in): Days with 10 cm or more snowfall	26	15	1972	4
25 cm (9.8 in): Days with 25 cm or more snowfall	9	4	1966	3
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1966	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 Cornwall 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).

Cornwall Threshold Days by Year (CA006101874)

Key Facts for Cornwall Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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