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Chico, California climate

Csa Hot-summer Mediterranean

Chico has a seasonal mild-temperate climate (Hot-summer Mediterranean, Köppen Csa). The hottest month is July with an average daily high near 35°C, while the coldest is January averaging around 2°C at night. Precipitation totals about 696 mm a year and is strongly seasonal — February alone averages 131 mm while July barely receives 1 mm.

☀️ Summers

Very hot

Highs near 35°C in July.

About 69 days a year above 32 °C

❄️ Winters

Chilly

Lows near 2°C in January.

About 25 freezing nights a year

🌧️ Rain

Moderate rainfall

About 696 mm of rain a year.

Wettest in February

⛅ Sky & trend

Fairly sunny

More sun than cloud through the year.

+0.5 °C vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Chico climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	13	17	19	23	27	32	35	35	33	27	18	14
Avg temp (°C)	8	10	12	15	19	23	26	25	23	18	11	8
Avg low (°C)	2	4	5	7	11	14	16	15	13	9	4	2
Precipitation (mm)	130	131	92	50	34	16	1	3	6	44	61	128

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	13	17	19	23	27	32
Avg temp (°C)	8	10	12	15	19	23
Avg low (°C)	2	4	5	7	11	14
Precipitation (mm)	130	131	92	50	34	16

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	35	35	33	27	18	14
Avg temp (°C)	26	25	23	18	11	8
Avg low (°C)	16	15	13	9	4	2
Precipitation (mm)	1	3	6	44	61	128

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	8	7	5	4	2	0.2	0.4	0.8	3	5	7
Days with high ≥ 32°C (days)	—	—	—	0.8	4	10	18	18	14	4	0.0	—
Days with low ≤ 0°C (days)	8	4	2	0.5	—	—	—	—	—	0.4	3	8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	10	8	7	5	4	2
Days with high ≥ 32°C (days)	—	—	—	0.8	4	10
Days with low ≤ 0°C (days)	8	4	2	0.5	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	0.2	0.4	0.8	3	5	7
Days with high ≥ 32°C (days)	18	18	14	4	0.0	—
Days with low ≤ 0°C (days)	—	—	—	0.4	3	8

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	61	59	55	48	39	24	12	13	19	31	50	61
Clear days (≤ 30% cloud)	8	7	10	12	16	22	27	27	23	19	10	7
Partly cloudy days (30–70%)	8	9	9	8	8	5	3	3	5	7	10	10
Cloudy days (≥ 70%)	15	13	13	10	7	3	0.9	1	2	5	10	14
Relative humidity (%)	78	78	77	72	61	45	31	29	30	41	59	74
Wind speed (m/s)	1.9	2.1	2.0	2.0	1.9	1.9	2.1	2.0	1.8	1.9	1.8	2.0

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	61	59	55	48	39	24
Clear days (≤ 30% cloud)	8	7	10	12	16	22
Partly cloudy days (30–70%)	8	9	9	8	8	5
Cloudy days (≥ 70%)	15	13	13	10	7	3
Relative humidity (%)	78	78	77	72	61	45
Wind speed (m/s)	1.9	2.1	2.0	2.0	1.9	1.9

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	12	13	19	31	50	61
Clear days (≤ 30% cloud)	27	27	23	19	10	7
Partly cloudy days (30–70%)	3	3	5	7	10	10
Cloudy days (≥ 70%)	0.9	1	2	5	10	14
Relative humidity (%)	31	29	30	41	59	74
Wind speed (m/s)	2.1	2.0	1.8	1.9	1.8	2.0

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Chico Univ Farm (NOAA GHCN station USC00041715), about 4 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →