Gridley Threshold Days by Year (USC00043639)

13 fixed thresholds counted per year at Gridley (USC00043639): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Gridley Thresholds

Gridley: days with 10 mm (0.39 in) or more of precipitation in 21 years, most in 1909 with 28.
Gridley: days with 25 mm (0.98 in) or more of precipitation in 21 years, most in 1909 with 11.
Gridley: days with a maximum temperature at or above 30 C (86 F) in 12 years, most in 1917 with 130.
Gridley: days with a maximum temperature at or above 35 C (95 F) in 12 years, most in 1917 with 76.
13 fixed thresholds have at least one qualifying day at Gridley.

Days at or above 30 C (86 F)

12 years with a qualifying day

Days per year at Gridley with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 130 in 1917.

Days at or above 30 C (86 F) per year at Gridley
Year	Days	Decade average
1917	130	130
1944	111	113.2
1945	118	113.2
1946	121	113.2
1947	116	113.2
1948	92	113.2
1949	121	113.2
1950	115	113.8
1951	128	113.8
1952	127	113.8
1953	90	113.8
1954	109	113.8

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

First to last qualifying date each year at Gridley
Year	First date	Last date
1917	1917-05-05	1917-10-26
1944	1944-05-02	1944-10-26
1945	1945-04-17	1945-10-14
1946	1946-04-22	1946-10-24
1947	1947-04-12	1947-10-04
1948	1948-05-23	1948-10-17
1949	1949-04-11	1949-10-31
1950	1950-04-17	1950-10-13
1951	1951-04-08	1951-10-14
1952	1952-04-05	1952-10-21
1953	1953-04-21	1953-10-09
1954	1954-04-15	1954-10-16

Every Fixed Threshold

Fixed thresholds at Gridley
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	12	130	1917	109
35 C (95 F): Days	12	76	1917	32
40 C (104 F): Days	12	20	1917	4
45 C (113 F): Days	1	1	1952	1
90 F (32.2 C): Days	12	107	1951	81
100 F (37.8 C): Days	12	39	1917	14
110 F (43.3 C): Days	2	3	1950	1
0 C (32 F): Frost days (min	10	58	1949	20
20 C (68 F): Tropical nights (min	9	10	1950	7
25 C (77 F): Days with min	1	1	1917	1
10 mm (0.39 in): Days with 10 mm or more rain	21	28	1909	17
25 mm (0.98 in): Days with 25 mm or more rain	21	11	1909	3
50 mm (1.97 in): Days with 50 mm or more rain	7	2	1911	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1917.

Download the Data

Data for Gridley 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).

Gridley Threshold Days by Year (USC00043639)

Key Facts for Gridley Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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