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Norco, California climate

BSh Hot semi-arid

Norco has a mildly seasonal warm-temperate climate (Hot semi-arid, Köppen BSh). The hottest month is August with an average daily high near 85°F, while the coldest is December averaging around 48°F at night. Precipitation totals about 13 inches a year and is strongly seasonal — February alone averages 3.2 inches while August barely receives 0.00 inches.

☀️ Summers

Warm

Highs near 85°F in August.

About 29 days a year above 90 °F

❄️ Winters

Cool

Lows near 48°F in December.

🌧️ Rain

Fairly dry

About 13 in of rain a year.

Wettest in February

⛅ Sky & trend

Fairly sunny

More sun than cloud through the year.

+0.9 °F 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

Norco climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	69	69	71	73	75	78	83	85	84	79	74	68
Avg temp (°F)	59	59	62	64	66	70	74	75	74	69	63	58
Avg low (°F)	49	50	52	54	58	61	65	65	64	59	53	48
Precipitation (in)	2.9	3.2	1.7	0.8	0.3	0.1	0.0	0.0	0.1	0.5	0.8	2.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	69	69	71	73	75	78
Avg temp (°F)	59	59	62	64	66	70
Avg low (°F)	49	50	52	54	58	61
Precipitation (in)	2.9	3.2	1.7	0.8	0.3	0.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	83	85	84	79	74	68
Avg temp (°F)	74	75	74	69	63	58
Avg low (°F)	65	65	64	59	53	48
Precipitation (in)	0.0	0.0	0.1	0.5	0.8	2.2

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	6	7	5	3	2	0.6	0.5	0.1	0.6	2	3	6
Days with high ≥ 90°F (days)	0.2	0.5	0.8	1	1	1	4	7	7	5	2	0.0
Days with low ≤ 32°F (days)	0.1	—	—	—	—	—	—	0.0	—	—	—	0.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	6	7	5	3	2	0.6
Days with high ≥ 90°F (days)	0.2	0.5	0.8	1	1	1
Days with low ≤ 32°F (days)	0.1	—	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	0.5	0.1	0.6	2	3	6
Days with high ≥ 90°F (days)	4	7	7	5	2	0.0
Days with low ≤ 32°F (days)	—	0.0	—	—	—	0.1

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	44	46	44	40	43	39	34	27	29	35	34	41
Clear days (≤ 30% cloud)	13	11	12	13	11	11	15	18	17	16	15	14
Partly cloudy days (30–70%)	9	9	12	11	15	15	14	12	10	10	10	9
Cloudy days (≥ 70%)	9	8	8	6	6	4	2	1.0	3	5	5	7
Relative humidity (%)	69	72	75	75	78	79	77	75	74	71	66	67
Wind speed (mph)	6.2	6.7	6.4	6.8	6.2	5.5	5.1	5.0	5.1	5.3	5.8	6.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	44	46	44	40	43	39
Clear days (≤ 30% cloud)	13	11	12	13	11	11
Partly cloudy days (30–70%)	9	9	12	11	15	15
Cloudy days (≥ 70%)	9	8	8	6	6	4
Relative humidity (%)	69	72	75	75	78	79
Wind speed (mph)	6.2	6.7	6.4	6.8	6.2	5.5

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	34	27	29	35	34	41
Clear days (≤ 30% cloud)	15	18	17	16	15	14
Partly cloudy days (30–70%)	14	12	10	10	10	9
Cloudy days (≥ 70%)	2	1.0	3	5	5	7
Relative humidity (%)	77	75	74	71	66	67
Wind speed (mph)	5.1	5.0	5.1	5.3	5.8	6.5

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Santa Ana Fire Stn (NOAA GHCN station USC00047888), about 36 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 →