Imperial Threshold Days by Year

16 fixed thresholds counted per year at Imperial (CA004013440): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Imperial Thresholds

Imperial: days with a maximum temperature at or above 30 C (86 F) in 26 years, most in 1961 with 37.
Imperial: days with a maximum temperature at or below 0 C (32 F) in 26 years, most in 1955 with 139.
Imperial: nights with a minimum temperature at or below 0 C (32 F) in 25 years, most in 1917 with 246.
Imperial: nights with a minimum temperature at or below -10 C (14 F) in 25 years, most in 1919 with 141.
16 fixed thresholds have at least one qualifying day at Imperial.

Days at or above 30 C (86 F)

26 years with a qualifying day

Days per year at Imperial with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 37 in 1961.

Days at or above 30 C (86 F) per year at Imperial
Year	Days	Decade average
1912	6	13.6
1913	3	13.6
1914	21	13.6
1915	10	13.6
1916	6	13.6
1917	17	13.6
1918	15	13.6
1919	31	13.6
1921	6	10.2
1922	10	10.2
1923	6	10.2
1924	12	10.2
1926	17	10.2
1952	11	12.7
1954	4	12.7
1955	17	12.7
1956	6	12.7
1957	17	12.7
1958	17	12.7
1959	17	12.7
1960	25	19.5
1961	37	19.5
1962	11	19.5
1963	14	19.5
1964	18	19.5
1965	12	19.5

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

First to last qualifying date each year at Imperial
Year	First date	Last date
1912	1912-06-23	1912-06-30
1913	1913-08-01	1913-09-05
1914	1914-06-01	1914-09-30
1915	1915-08-04	1915-09-06
1916	1916-07-13	1916-08-15
1917	1917-07-14	1917-09-23
1918	1918-06-09	1918-09-07
1919	1919-05-22	1919-08-31
1921	1921-06-29	1921-08-31
1922	1922-06-04	1922-09-20
1923	1923-05-26	1923-07-24
1924	1924-07-03	1924-07-26
1926	1926-04-29	1926-08-25
1952	1952-04-28	1952-09-26
1954	1954-06-22	1954-08-30
1955	1955-06-29	1955-09-02
1956	1956-06-01	1956-09-26
1957	1957-07-09	1957-09-07
1958	1958-05-12	1958-08-17
1959	1959-05-16	1959-08-07
1960	1960-05-11	1960-09-04
1961	1961-06-03	1961-08-31
1962	1962-06-25	1962-08-21
1963	1963-07-05	1963-09-10
1964	1964-05-17	1964-09-17
1965	1965-06-10	1965-08-23

Every Fixed Threshold

Fixed thresholds at Imperial
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	26	37	1961	12
35 C (95 F): Days	17	5	1961	1
90 F (32.2 C): Days	23	24	1961	5
100 F (37.8 C): Days	4	1	1918	1
0 C (32 F): Ice days (max	26	139	1955	132
0 C (32 F): Frost days (min	25	246	1917	218
-10 C (14 F): Days with min	25	141	1919	131
-20 C (-4 F): Days with min	25	84	1917	67
-30 C (-22 F): Days with min	25	41	1916	17
-40 C (-40 F): Days with min	8	6	1954	1
20 C (68 F): Tropical nights (min	2	1	1916	1
10 mm (0.39 in): Days with 10 mm or more rain	14	15	1954	5
25 mm (0.98 in): Days with 25 mm or more rain	13	6	1954	1
50 mm (1.97 in): Days with 50 mm or more rain	5	2	1954	1
10 cm (3.9 in): Days with 10 cm or more snowfall	9	3	1913	2
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1922	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1912.

Download the Data

Data for Imperial 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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

Data as of 2026-10-15. Last revised 15 October 2026 (2026-10-15).

Imperial Threshold Days by Year

Key Facts for Imperial Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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