Chamberlain Threshold Days by Year (USC00391609)

19 fixed thresholds counted per year at Chamberlain (USC00391609): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Chamberlain Thresholds

Chamberlain: days with 10 mm (0.39 in) or more of precipitation in 46 years, most in 1962 with 27.
Chamberlain: days with 25 mm (0.98 in) or more of precipitation in 46 years, most in 1977 with 9.
Chamberlain: days with a maximum temperature at or above 30 C (86 F) in 27 years, most in 1976 with 91.
Chamberlain: days with a maximum temperature at or above 90 F (32.2 C) in 27 years, most in 1976 with 69.
19 fixed thresholds have at least one qualifying day at Chamberlain.

Days at or above 30 C (86 F)

27 years with a qualifying day

Days per year at Chamberlain with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 91 in 1976.

Days at or above 30 C (86 F) per year at Chamberlain
Year	Days	Decade average
1897	80	76
1898	72	76
1900	90	64.2
1901	76	64.2
1902	44	64.2
1903	56	64.2
1904	59	64.2
1905	57	64.2
1906	61	64.2
1907	66	64.2
1908	69	64.2
1915	19	19
1964	67	66.5
1965	58	66.5
1966	82	66.5
1967	63	66.5
1968	62	66.5
1969	67	66.5
1970	82	77.2
1971	75	77.2
1972	63	77.2
1973	80	77.2
1974	75	77.2
1975	80	77.2
1976	91	77.2
1977	68	77.2
1978	81	77.2

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

First to last qualifying date each year at Chamberlain
Year	First date	Last date
1897	1897-04-27	1897-10-03
1898	1898-04-15	1898-10-01
1900	1900-05-10	1900-10-19
1901	1901-04-24	1901-09-05
1902	1902-04-20	1902-09-15
1903	1903-05-16	1903-10-02
1904	1904-05-22	1904-10-07
1905	1905-06-01	1905-10-08
1906	1906-04-24	1906-10-12
1907	1907-03-21	1907-10-16
1908	1908-04-11	1908-10-15
1915	1915-05-10	1915-10-23
1964	1964-04-16	1964-09-30
1965	1965-04-29	1965-10-05
1966	1966-05-04	1966-10-08
1967	1967-05-22	1967-10-03
1968	1968-04-11	1968-10-13
1969	1969-05-14	1969-09-14
1970	1970-04-26	1970-10-05
1971	1971-04-07	1971-09-14
1972	1972-05-15	1972-09-20
1973	1973-05-20	1973-10-07
1974	1974-05-20	1974-10-10
1975	1975-04-27	1975-10-07
1976	1976-05-04	1976-09-30
1977	1977-04-09	1977-09-11
1978	1978-03-30	1978-09-28

Every Fixed Threshold

Fixed thresholds at Chamberlain
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	27	91	1976	81
35 C (95 F): Days	26	45	1976	28
40 C (104 F): Days	20	9	1901	1
90 F (32.2 C): Days	27	69	1976	54
100 F (37.8 C): Days	26	20	1976	7
110 F (43.3 C): Days	3	2	1964	1
0 C (32 F): Ice days (max	27	76	1978	76
0 C (32 F): Frost days (min	27	191	1907	131
-10 C (14 F): Days with min	27	80	1900	78
-20 C (-4 F): Days with min	27	30	1978	30
-30 C (-22 F): Days with min	7	8	1905	1
-40 C (-40 F): Days with min	1	1	1905	1
20 C (68 F): Tropical nights (min	27	29	1976	25
25 C (77 F): Days with min	15	5	1976	5
10 mm (0.39 in): Days with 10 mm or more rain	46	27	1962	15
25 mm (0.98 in): Days with 25 mm or more rain	46	9	1977	5
50 mm (1.97 in): Days with 50 mm or more rain	22	2	1962	1
10 cm (3.9 in): Days with 10 cm or more snowfall	18	4	1953	1
25 cm (9.8 in): Days with 25 cm or more snowfall	4	1	1950	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1897.

Download the Data

Data for Chamberlain 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).

Chamberlain Threshold Days by Year (USC00391609)

Key Facts for Chamberlain Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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