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Porterville, California climate

BSh Hot semi-arid

Porterville has a seasonal warm-temperate climate (Hot semi-arid, Köppen BSh). The hottest month is July with an average daily high near 98°F, while the coldest is December averaging around 39°F at night. Precipitation totals about 11 inches a year and is strongly seasonal — January alone averages 2.1 inches while August barely receives 0.00 inches.

☀️ Summers

Very hot

Highs near 98°F in July.

About 116 days a year above 90 °F

❄️ Winters

Chilly

Lows near 39°F in December.

About 15 freezing nights a year

🌧️ Rain

Fairly dry

About 11 in of rain a year.

Wettest in January

⛅ Sky & trend

Fairly sunny

More sun than cloud through the year.

+1.1 °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

Porterville climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	59	65	71	76	84	93	98	97	92	82	68	59
Avg temp (°F)	49	54	59	63	70	78	83	82	77	68	56	49
Avg low (°F)	40	43	47	50	56	63	68	67	62	53	44	39
Precipitation (in)	2.1	1.9	2.0	1.0	0.3	0.1	0.1	0.0	0.1	0.6	1.0	1.9

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	59	65	71	76	84	93
Avg temp (°F)	49	54	59	63	70	78
Avg low (°F)	40	43	47	50	56	63
Precipitation (in)	2.1	1.9	2.0	1.0	0.3	0.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	98	97	92	82	68	59
Avg temp (°F)	83	82	77	68	56	49
Avg low (°F)	68	67	62	53	44	39
Precipitation (in)	0.1	0.0	0.1	0.6	1.0	1.9

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	9	9	7	5	2	0.7	0.2	0.3	0.9	2	4	7
Days with high ≥ 90°F (days)	—	—	0.1	3	10	21	27	27	21	7	—	—
Days with low ≤ 32°F (days)	6	2	0.2	0.1	0.1	—	—	0.1	—	—	1	6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	9	9	7	5	2	0.7
Days with high ≥ 90°F (days)	—	—	0.1	3	10	21
Days with low ≤ 32°F (days)	6	2	0.2	0.1	0.1	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	0.2	0.3	0.9	2	4	7
Days with high ≥ 90°F (days)	27	27	21	7	—	—
Days with low ≤ 32°F (days)	—	0.1	—	—	1	6

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	60	52	46	38	30	19	16	13	16	26	43	56
Clear days (≤ 30% cloud)	6	9	12	14	19	24	26	27	24	21	12	7
Partly cloudy days (30–70%)	12	9	10	10	8	5	4	3	4	7	12	13
Cloudy days (≥ 70%)	13	10	9	6	4	2	1	0.9	2	3	7	11
Relative humidity (%)	60	64	63	59	50	35	28	27	31	39	49	57
Wind speed (mph)	2.9	3.1	3.2	3.7	3.8	3.8	3.5	3.4	3.3	3.2	2.9	2.8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	60	52	46	38	30	19
Clear days (≤ 30% cloud)	6	9	12	14	19	24
Partly cloudy days (30–70%)	12	9	10	10	8	5
Cloudy days (≥ 70%)	13	10	9	6	4	2
Relative humidity (%)	60	64	63	59	50	35
Wind speed (mph)	2.9	3.1	3.2	3.7	3.8	3.8

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	16	13	16	26	43	56
Clear days (≤ 30% cloud)	26	27	24	21	12	7
Partly cloudy days (30–70%)	4	3	4	7	12	13
Cloudy days (≥ 70%)	1	0.9	2	3	7	11
Relative humidity (%)	28	27	31	39	49	57
Wind speed (mph)	3.5	3.4	3.3	3.2	2.9	2.8

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Porterville (NOAA GHCN station USC00047077), inside the city.

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 →