Montebello Threshold Days by Year (USC00045790)

12 fixed thresholds counted per year at Montebello (USC00045790): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Montebello Thresholds

Montebello: days with 10 mm (0.39 in) or more of precipitation in 20 years, most in 1983 with 21.
Montebello: days with 25 mm (0.98 in) or more of precipitation in 19 years, most in 1983 with 11.
Montebello: days with 50 mm (1.97 in) or more of precipitation in 14 years, most in 1983 with 4.
Montebello: nights with a minimum temperature at or above 20 C (68 F) in 12 years, most in 1983 with 53.
12 fixed thresholds have at least one qualifying day at Montebello.

Days at or above 30 C (86 F)

11 years with a qualifying day

Days per year at Montebello with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 139 in 1981.

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

First to last qualifying date each year at Montebello
Year	First date	Last date
1979	1979-03-06	1979-12-05
1980	1980-04-08	1980-12-31
1981	1981-02-16	1981-12-02
1982	1982-04-20	1982-11-07
1983	1983-01-11	1983-11-04
1985	1985-02-13	1985-12-24
1986	1986-01-18	1986-11-12
1987	1987-01-26	1987-12-11
1989	1989-02-22	1989-12-09
1990	1990-03-19	1990-11-23
1993	1993-03-07	1993-11-03

Every Fixed Threshold

Fixed thresholds at Montebello
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	11	139	1981	81
35 C (95 F): Days	11	33	1981	7
40 C (104 F): Days	8	6	1979	2
90 F (32.2 C): Days	11	90	1981	39
100 F (37.8 C): Days	11	12	1979	1
0 C (32 F): Frost days (min	6	6	1990	6
20 C (68 F): Tropical nights (min	12	53	1983	5
25 C (77 F): Days with min	5	4	1983	3
10 mm (0.39 in): Days with 10 mm or more rain	20	21	1983	1
25 mm (0.98 in): Days with 25 mm or more rain	19	11	1983	1
50 mm (1.97 in): Days with 50 mm or more rain	14	4	1983	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1993	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1979.

Download the Data

Data for Montebello 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).

Year	Days	Decade average
1979	106	106
1980	123	96.6
1981	139	96.6
1982	80	96.6
1983	80	96.6
1985	95	96.6
1986	85	96.6
1987	77	96.6
1989	94	96.6
1990	111	96
1993	81	96

Montebello Threshold Days by Year (USC00045790)

Key Facts for Montebello Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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