Harris Threshold Days by Year (CA004053120)

17 fixed thresholds counted per year at Harris (CA004053120): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Harris Thresholds

Harris: nights with a minimum temperature at or below 0 C (32 F) in 46 years, most in 1941 with 234.
Harris: nights with a minimum temperature at or below -10 C (14 F) in 46 years, most in 1945 with 148.
Harris: nights with a minimum temperature at or below -20 C (-4 F) in 46 years, most in 1950 with 95.
Harris: nights with a minimum temperature at or below -30 C (-22 F) in 45 years, most in 1936 with 39.
17 fixed thresholds have at least one qualifying day at Harris.

Days at or above 30 C (86 F)

44 years with a qualifying day

Days per year at Harris with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 52 in 1945.

Days at or above 30 C (86 F) per year at Harris
Year	Days	Decade average
1924	16	22.3
1925	16	22.3
1929	35	22.3
1930	47	30.3
1931	33	30.3
1932	16	30.3
1933	39	30.3
1934	37	30.3
1935	15	30.3
1936	37	30.3
1937	34	30.3
1938	23	30.3
1939	22	30.3
1940	20	24.1
1941	29	24.1
1942	9	24.1
1943	26	24.1
1944	12	24.1
1945	52	24.1
1946	21	24.1
1950	11	9.3
1957	5	9.3
1958	12	9.3
1961	36	16.6
1962	8	16.6
1964	18	16.6
1965	13	16.6
1966	14	16.6
1967	22	16.6
1968	8	16.6
1969	14	16.6
1970	15	14.2
1972	3	14.2
1973	18	14.2
1974	11	14.2
1975	13	14.2
1976	15	14.2
1977	9	14.2
1978	21	14.2
1979	23	14.2
1980	19	21
1981	32	21
1982	14	21
1983	19	21

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

First to last qualifying date each year at Harris
Year	First date	Last date
1924	1924-06-29	1924-09-06
1925	1925-05-18	1925-08-26
1929	1929-05-24	1929-08-31
1930	1930-06-08	1930-09-09
1931	1931-05-13	1931-09-06
1932	1932-06-14	1932-09-07
1933	1933-05-30	1933-08-29
1934	1934-05-15	1934-09-09
1935	1935-06-10	1935-09-14
1936	1936-05-26	1936-08-30
1937	1937-06-13	1937-09-12
1938	1938-05-27	1938-09-24
1939	1939-04-28	1939-08-31
1940	1940-07-03	1940-09-11
1941	1941-05-24	1941-08-17
1942	1942-07-07	1942-09-07
1943	1943-06-30	1943-08-29
1944	1944-05-28	1944-08-18
1945	1945-06-21	1945-09-05
1946	1946-07-01	1946-08-26
1950	1950-05-27	1950-08-13
1957	1957-07-09	1957-10-01
1958	1958-05-12	1958-09-12
1961	1961-05-21	1961-09-05
1962	1962-06-24	1962-09-27
1964	1964-05-19	1964-08-18
1965	1965-06-10	1965-08-23
1966	1966-05-26	1966-09-18
1967	1967-06-02	1967-09-28
1968	1968-06-19	1968-09-11
1969	1969-07-10	1969-09-13
1970	1970-06-02	1970-08-22
1972	1972-05-31	1972-06-07
1973	1973-06-22	1973-08-16
1974	1974-06-19	1974-08-05
1975	1975-06-24	1975-09-15
1976	1976-05-28	1976-09-17
1977	1977-04-26	1977-08-24
1978	1978-06-04	1978-09-04
1979	1979-06-13	1979-09-16
1980	1980-04-20	1980-09-07
1981	1981-05-21	1981-09-19
1982	1982-06-13	1982-09-09
1983	1983-06-09	1983-09-26

Every Fixed Threshold

Fixed thresholds at Harris
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	44	52	1945	19
35 C (95 F): Days	32	11	1945	5
40 C (104 F): Days	4	2	1941	1
90 F (32.2 C): Days	44	35	1945	9
100 F (37.8 C): Days	7	5	1941	1
0 C (32 F): Ice days (max	44	145	1944	112
0 C (32 F): Frost days (min	46	234	1941	202
-10 C (14 F): Days with min	46	148	1945	97
-20 C (-4 F): Days with min	46	95	1950	42
-30 C (-22 F): Days with min	45	39	1936	15
-40 C (-40 F): Days with min	20	9	1950	1
20 C (68 F): Tropical nights (min	3	1	1936	1
10 mm (0.39 in): Days with 10 mm or more rain	30	18	1942	12
25 mm (0.98 in): Days with 25 mm or more rain	26	3	1925	2
50 mm (1.97 in): Days with 50 mm or more rain	5	2	1983	2
10 cm (3.9 in): Days with 10 cm or more snowfall	28	8	1935	2
25 cm (9.8 in): Days with 25 cm or more snowfall	4	1	1967	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1924.

Download the Data

Data for Harris 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).

Harris Threshold Days by Year (CA004053120)

Key Facts for Harris Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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