Lethbridge A Threshold Days by Year (CA003033880)

17 fixed thresholds counted per year at Lethbridge A (CA003033880): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Lethbridge A Thresholds

Lethbridge A: days with a maximum temperature at or above 30 C (86 F) in 46 years, most in 1961 with 35.
Lethbridge A: days with a maximum temperature at or above 90 F (32.2 C) in 46 years, most in 1970 with 21.
Lethbridge A: days with a maximum temperature at or below 0 C (32 F) in 46 years, most in 1951 with 96.
Lethbridge A: nights with a minimum temperature at or below 0 C (32 F) in 46 years, most in 1970 with 202.
17 fixed thresholds have at least one qualifying day at Lethbridge A.

Days at or above 30 C (86 F)

46 years with a qualifying day

Days per year at Lethbridge A with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 35 in 1961.

Days at or above 30 C (86 F) per year at Lethbridge A
Year	Days	Decade average
1938	29	29
1939	29	29
1940	29	18.6
1941	18	18.6
1942	13	18.6
1943	25	18.6
1944	16	18.6
1945	19	18.6
1946	18	18.6
1947	19	18.6
1948	12	18.6
1949	17	18.6
1950	13	15.1
1951	9	15.1
1952	11	15.1
1953	16	15.1
1954	11	15.1
1955	17	15.1
1956	15	15.1
1957	17	15.1
1958	22	15.1
1959	20	15.1
1960	26	20.4
1961	35	20.4
1962	13	20.4
1963	20	20.4
1964	13	20.4
1965	14	20.4
1966	15	20.4
1967	34	20.4
1968	11	20.4
1969	23	20.4
1970	32	18.3
1971	30	18.3
1972	16	18.3
1973	21	18.3
1974	20	18.3
1975	10	18.3
1976	12	18.3
1977	9	18.3
1978	16	18.3
1979	17	18.3
1980	8	14
1981	18	14
1982	13	14
1983	17	14

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

First to last qualifying date each year at Lethbridge A
Year	First date	Last date
1938	1938-06-20	1938-09-21
1939	1939-04-28	1939-08-25
1940	1940-05-10	1940-08-31
1941	1941-05-23	1941-08-22
1942	1942-07-03	1942-08-23
1943	1943-07-02	1943-10-04
1944	1944-05-15	1944-09-12
1945	1945-06-21	1945-09-03
1946	1946-07-11	1946-08-23
1947	1947-07-02	1947-08-08
1948	1948-06-07	1948-09-14
1949	1949-05-11	1949-09-23
1950	1950-06-20	1950-09-03
1951	1951-07-16	1951-08-21
1952	1952-07-04	1952-09-26
1953	1953-07-11	1953-09-13
1954	1954-06-22	1954-08-29
1955	1955-07-14	1955-09-06
1956	1956-05-31	1956-08-23
1957	1957-06-04	1957-10-01
1958	1958-05-28	1958-09-11
1959	1959-06-12	1959-09-12
1960	1960-06-30	1960-09-03
1961	1961-06-03	1961-08-30
1962	1962-06-24	1962-10-01
1963	1963-06-18	1963-09-29
1964	1964-05-19	1964-08-18
1965	1965-06-10	1965-08-12
1966	1966-05-26	1966-09-18
1967	1967-07-03	1967-09-29
1968	1968-06-19	1968-09-11
1969	1969-06-04	1969-09-12
1970	1970-06-02	1970-08-31
1971	1971-06-22	1971-08-27
1972	1972-05-30	1972-08-29
1973	1973-06-22	1973-09-06
1974	1974-06-12	1974-08-05
1975	1975-07-04	1975-09-15
1976	1976-05-27	1976-09-05
1977	1977-06-01	1977-07-28
1978	1978-06-28	1978-09-04
1979	1979-06-12	1979-09-15
1980	1980-05-21	1980-09-06
1981	1981-07-03	1981-09-18
1982	1982-06-21	1982-09-03
1983	1983-07-05	1983-09-01

Every Fixed Threshold

Fixed thresholds at Lethbridge A
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	46	35	1961	17
35 C (95 F): Days	27	5	1939	2
90 F (32.2 C): Days	46	21	1970	8
100 F (37.8 C): Days	5	2	1941	1
0 C (32 F): Ice days (max	46	96	1951	58
0 C (32 F): Frost days (min	46	202	1970	173
-10 C (14 F): Days with min	46	101	1955	56
-20 C (-4 F): Days with min	46	49	1949	24
-30 C (-22 F): Days with min	44	23	1950	9
-40 C (-40 F): Days with min	7	5	1950	1
20 C (68 F): Tropical nights (min	4	1	1941	1
10 mm (0.39 in): Days with 10 mm or more rain	46	20	1978	6
25 mm (0.98 in): Days with 25 mm or more rain	37	7	1978	1
50 mm (1.97 in): Days with 50 mm or more rain	11	2	1951	1
10 cm (3.9 in): Days with 10 cm or more snowfall	41	10	1967	1
25 cm (9.8 in): Days with 25 cm or more snowfall	11	2	1947	1
50 cm (19.7 in): Days with 50 cm or more snowfall	2	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 1938.

Download the Data

Data for Lethbridge A 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).

Lethbridge A Threshold Days by Year (CA003033880)

Key Facts for Lethbridge A Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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