Atwater Threshold Days by Year (CA004010310)

15 fixed thresholds counted per year at Atwater (CA004010310): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Atwater Thresholds

Atwater: days with a maximum temperature at or above 30 C (86 F) in 6 years, most in 1983 with 25.
Atwater: days with a maximum temperature at or above 90 F (32.2 C) in 6 years, most in 1983 with 10.
Atwater: days with a maximum temperature at or below 0 C (32 F) in 6 years, most in 1979 with 138.
Atwater: nights with a minimum temperature at or below 0 C (32 F) in 6 years, most in 1983 with 211.
15 fixed thresholds have at least one qualifying day at Atwater.

Days at or above 30 C (86 F)

6 years with a qualifying day

Days per year at Atwater with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 25 in 1983.

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

First to last qualifying date each year at Atwater
Year	First date	Last date
1978	1978-06-05	1978-09-03
1979	1979-06-12	1979-09-16
1980	1980-04-20	1980-09-07
1981	1981-06-30	1981-09-09
1982	1982-07-02	1982-09-10
1983	1983-06-11	1983-09-26

Every Fixed Threshold

Fixed thresholds at Atwater
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	6	25	1983	25
35 C (95 F): Days	5	3	1979	3
90 F (32.2 C): Days	6	10	1983	10
100 F (37.8 C): Days	2	1	1980	1
0 C (32 F): Ice days (max	6	138	1979	136
0 C (32 F): Frost days (min	6	211	1983	211
-10 C (14 F): Days with min	6	130	1979	114
-20 C (-4 F): Days with min	6	82	1978	56
-30 C (-22 F): Days with min	6	28	1979	18
-40 C (-40 F): Days with min	2	1	1978	1
20 C (68 F): Tropical nights (min	1	1	1983	1
10 mm (0.39 in): Days with 10 mm or more rain	6	15	1981	8
25 mm (0.98 in): Days with 25 mm or more rain	4	3	1980	1
10 cm (3.9 in): Days with 10 cm or more snowfall	3	1	1978	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1983	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1978.

Download the Data

Data for Atwater 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).

Atwater Threshold Days by Year (CA004010310)

Key Facts for Atwater Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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