Chapman Rch Threshold Days by Year (USC00411651)

15 fixed thresholds counted per year at Chapman Rch (USC00411651): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Chapman Rch Thresholds

Chapman Rch: days with 10 mm (0.39 in) or more of precipitation in 40 years, most in 1960 with 32.
Chapman Rch: days with 25 mm (0.98 in) or more of precipitation in 40 years, most in 1973 with 17.
Chapman Rch: days with 50 mm (1.97 in) or more of precipitation in 37 years, most in 1960 with 7.
Chapman Rch: nights with a minimum temperature at or below 0 C (32 F) in 36 years, most in 1989 with 17.
15 fixed thresholds have at least one qualifying day at Chapman Rch.

Days at or above 30 C (86 F)

32 years with a qualifying day

Days per year at Chapman Rch with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 183 in 1963.

Days at or above 30 C (86 F) per year at Chapman Rch
Year	Days	Decade average
1960	146	154
1961	145	154
1962	177	154
1963	183	154
1964	156	154
1965	141	154
1966	145	154
1967	150	154
1968	140	154
1969	157	154
1970	132	145.8
1971	153	145.8
1972	160	145.8
1973	152	145.8
1974	149	145.8
1975	152	145.8
1976	121	145.8
1977	150	145.8
1978	150	145.8
1979	139	145.8
1980	162	149.3
1981	179	149.3
1985	144	149.3
1986	142	149.3
1987	115	149.3
1988	146	149.3
1989	157	149.3
1990	152	151
1992	139	151
1996	171	151
1997	142	151
2001	155	155

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

First to last qualifying date each year at Chapman Rch
Year	First date	Last date
1960	1960-02-09	1960-11-09
1961	1961-04-03	1961-12-09
1962	1962-02-09	1962-11-11
1963	1963-01-10	1963-11-06
1964	1964-04-06	1964-12-25
1965	1965-03-12	1965-11-26
1966	1966-03-03	1966-11-11
1967	1967-04-14	1967-11-24
1968	1968-04-03	1968-12-27
1969	1969-03-23	1969-11-13
1970	1970-03-25	1970-11-19
1971	1971-01-30	1971-11-02
1972	1972-01-21	1972-12-05
1973	1973-03-06	1973-11-26
1974	1974-02-18	1974-12-24
1975	1975-03-01	1975-11-02
1976	1976-02-17	1976-10-04
1977	1977-03-19	1977-12-16
1978	1978-03-11	1978-12-20
1979	1979-04-11	1979-11-09
1980	1980-02-19	1980-10-27
1981	1981-03-04	1981-11-27
1985	1985-04-05	1985-10-24
1986	1986-02-17	1986-10-11
1987	1987-04-13	1987-12-11
1988	1988-04-05	1988-11-26
1989	1989-01-07	1989-11-15
1990	1990-02-09	1990-11-27
1992	1992-03-06	1992-11-03
1996	1996-02-19	1996-11-21
1997	1997-01-04	1997-11-05
2001	2001-03-11	2001-11-02

Every Fixed Threshold

Fixed thresholds at Chapman Rch
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	32	183	1963	155
35 C (95 F): Days	31	61	2001	61
40 C (104 F): Days	1	3	1962	3
90 F (32.2 C): Days	32	128	1962	115
100 F (37.8 C): Days	6	5	1962	1
0 C (32 F): Ice days (max	2	2	1962	2
0 C (32 F): Frost days (min	36	17	1989	1
-10 C (14 F): Days with min	3	1	1962	1
20 C (68 F): Tropical nights (min	36	191	1963	156
25 C (77 F): Days with min	36	82	1980	33
10 mm (0.39 in): Days with 10 mm or more rain	40	32	1960	18
25 mm (0.98 in): Days with 25 mm or more rain	40	17	1973	9
50 mm (1.97 in): Days with 50 mm or more rain	37	7	1960	5
100 mm (3.94 in): Days with 100 mm or more rain	15	2	1960	1
200 mm (7.87 in): Days with 200 mm or more rain	3	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 1960.

Download the Data

Data for Chapman Rch 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).

Chapman Rch Threshold Days by Year (USC00411651)

Key Facts for Chapman Rch Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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