Casper 2 E Threshold Days by Year (USC00481565)

18 fixed thresholds counted per year at Casper 2 E (USC00481565): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Casper 2 E Thresholds

Casper 2 E: days with a maximum temperature at or above 30 C (86 F) in 47 years, most in 1911 with 99.
Casper 2 E: days with a maximum temperature at or above 90 F (32.2 C) in 47 years, most in 1911 with 85.
Casper 2 E: days with a maximum temperature at or below 0 C (32 F) in 47 years, most in 1978 with 49.
Casper 2 E: nights with a minimum temperature at or below 0 C (32 F) in 47 years, most in 1968 with 184.
18 fixed thresholds have at least one qualifying day at Casper 2 E.

Days at or above 30 C (86 F)

47 years with a qualifying day

Days per year at Casper 2 E with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 99 in 1911.

Days at or above 30 C (86 F) per year at Casper 2 E
Year	Days	Decade average
1911	99	60.7
1914	45	60.7
1917	38	60.7
1921	55	47
1922	53	47
1923	36	47
1924	56	47
1925	45	47
1926	42	47
1927	29	47
1929	60	47
1930	41	58.4
1931	59	58.4
1932	64	58.4
1934	49	58.4
1935	64	58.4
1936	69	58.4
1938	63	58.4
1949	62	62
1950	40	60.2
1951	40	60.2
1952	73	60.2
1953	75	60.2
1954	72	60.2
1955	68	60.2
1956	65	60.2
1957	42	60.2
1958	51	60.2
1959	76	60.2
1960	67	61.9
1961	68	61.9
1962	47	61.9
1963	75	61.9
1964	63	61.9
1966	76	61.9
1967	48	61.9
1968	47	61.9
1969	66	61.9
1970	70	59.7
1971	71	59.7
1972	39	59.7
1973	53	59.7
1974	64	59.7
1975	59	59.7
1976	62	59.7
1977	63	59.7
1978	56	59.7

For each year, a bar from the first to the last day at Casper 2 E meeting 30 C (86 F).

First to last qualifying date each year at Casper 2 E
Year	First date	Last date
1911	1911-05-30	1911-09-28
1914	1914-06-29	1914-09-19
1917	1917-06-28	1917-09-04
1921	1921-06-10	1921-09-02
1922	1922-06-09	1922-08-31
1923	1923-06-15	1923-09-04
1924	1924-06-13	1924-09-06
1925	1925-05-29	1925-09-02
1926	1926-06-26	1926-08-31
1927	1927-06-08	1927-09-10
1929	1929-06-15	1929-09-02
1930	1930-06-11	1930-08-25
1931	1931-05-25	1931-09-13
1932	1932-06-14	1932-09-14
1934	1934-05-06	1934-09-11
1935	1935-06-08	1935-09-24
1936	1936-05-14	1936-09-12
1938	1938-05-27	1938-09-29
1949	1949-06-11	1949-09-23
1950	1950-06-06	1950-09-06
1951	1951-07-04	1951-08-31
1952	1952-06-06	1952-09-11
1953	1953-06-09	1953-09-15
1954	1954-05-19	1954-09-22
1955	1955-06-21	1955-09-15
1956	1956-06-01	1956-09-21
1957	1957-06-04	1957-10-01
1958	1958-05-22	1958-09-23
1959	1959-06-07	1959-09-14
1960	1960-05-12	1960-09-05
1961	1961-06-09	1961-09-07
1962	1962-06-26	1962-09-17
1963	1963-06-13	1963-09-27
1964	1964-05-19	1964-09-09
1966	1966-05-06	1966-09-23
1967	1967-05-23	1967-09-24
1968	1968-06-03	1968-09-20
1969	1969-05-25	1969-09-03
1970	1970-06-22	1970-09-02
1971	1971-06-15	1971-09-13
1972	1972-06-01	1972-08-18
1973	1973-06-08	1973-08-31
1974	1974-06-13	1974-09-10
1975	1975-06-24	1975-09-10
1976	1976-05-14	1976-09-17
1977	1977-06-01	1977-09-08
1978	1978-05-15	1978-09-10

Every Fixed Threshold

Fixed thresholds at Casper 2 E
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	47	99	1911	56
35 C (95 F): Days	45	57	1911	5
40 C (104 F): Days	3	2	1911	2
90 F (32.2 C): Days	47	85	1911	27
100 F (37.8 C): Days	22	31	1911	1
0 C (32 F): Ice days (max	47	49	1978	49
0 C (32 F): Frost days (min	47	184	1968	168
-10 C (14 F): Days with min	47	68	1978	68
-20 C (-4 F): Days with min	47	23	1949	13
-30 C (-22 F): Days with min	22	6	1936	2
-40 C (-40 F): Days with min	1	1	1936	1
20 C (68 F): Tropical nights (min	37	6	1935	3
25 C (77 F): Days with min	3	1	1931	1
10 mm (0.39 in): Days with 10 mm or more rain	39	16	1932	10
25 mm (0.98 in): Days with 25 mm or more rain	30	5	1971	3
50 mm (1.97 in): Days with 50 mm or more rain	6	2	1972	1
10 cm (3.9 in): Days with 10 cm or more snowfall	30	9	1936	3
25 cm (9.8 in): Days with 25 cm or more snowfall	8	2	1936	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1911.

Download the Data

Data for Casper 2 E 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).

Casper 2 E Threshold Days by Year (USC00481565)

Key Facts for Casper 2 E Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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