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Lompoc, California climate

Csb Warm-summer Mediterranean

Lompoc has a mildly seasonal mild-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is September with an average daily high near 75°F, while the coldest is December averaging around 42°F at night. Precipitation totals about 15 inches a year and is strongly seasonal — February alone averages 3.7 inches while August barely receives 0.01 inches.

☀️ Summers

Mild

Highs near 75°F in September.

About 5 days a year above 90 °F

❄️ Winters

Cool

Lows near 42°F in December.

About 4 freezing nights a year

🌧️ Rain

Fairly dry

About 15 in of rain a year.

Wettest in February

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+0.1 °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

Lompoc climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	65	65	67	68	69	71	73	73	75	74	70	63
Avg temp (°F)	54	55	57	58	60	62	64	65	65	63	58	53
Avg low (°F)	43	44	46	47	51	53	56	56	55	51	46	42
Precipitation (in)	3.3	3.7	2.8	0.9	0.3	0.1	0.0	0.0	0.1	0.7	1.2	2.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	65	65	67	68	69	71
Avg temp (°F)	54	55	57	58	60	62
Avg low (°F)	43	44	46	47	51	53
Precipitation (in)	3.3	3.7	2.8	0.9	0.3	0.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	73	73	75	74	70	63
Avg temp (°F)	64	65	65	63	58	53
Avg low (°F)	56	56	55	51	46	42
Precipitation (in)	0.0	0.0	0.1	0.7	1.2	2.4

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	8	8	8	4	2	0.7	0.6	0.3	0.6	3	5	7
Days with high ≥ 90°F (days)	—	—	0.2	0.3	0.6	0.4	0.2	0.4	1	2	0.3	—
Days with low ≤ 32°F (days)	1	0.6	—	0.0	—	—	—	—	—	0.1	0.2	2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	8	8	8	4	2	0.7
Days with high ≥ 90°F (days)	—	—	0.2	0.3	0.6	0.4
Days with low ≤ 32°F (days)	1	0.6	—	0.0	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	0.6	0.3	0.6	3	5	7
Days with high ≥ 90°F (days)	0.2	0.4	1	2	0.3	—
Days with low ≤ 32°F (days)	—	—	—	0.1	0.2	2

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	52	54	52	46	50	53	61	59	54	46	44	50
Clear days (≤ 30% cloud)	10	8	10	10	9	7	3	4	7	12	12	11
Partly cloudy days (30–70%)	10	10	11	12	13	13	16	16	13	11	11	11
Cloudy days (≥ 70%)	11	10	11	7	9	10	11	11	10	8	7	10
Relative humidity (%)	77	79	81	81	81	79	78	77	76	74	74	75
Wind speed (mph)	8.7	9.7	10.0	11.2	11.3	11.1	9.9	10.2	9.5	9.0	9.0	9.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	52	54	52	46	50	53
Clear days (≤ 30% cloud)	10	8	10	10	9	7
Partly cloudy days (30–70%)	10	10	11	12	13	13
Cloudy days (≥ 70%)	11	10	11	7	9	10
Relative humidity (%)	77	79	81	81	81	79
Wind speed (mph)	8.7	9.7	10.0	11.2	11.3	11.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	61	59	54	46	44	50
Clear days (≤ 30% cloud)	3	4	7	12	12	11
Partly cloudy days (30–70%)	16	16	13	11	11	11
Cloudy days (≥ 70%)	11	11	10	8	7	10
Relative humidity (%)	78	77	76	74	74	75
Wind speed (mph)	9.9	10.2	9.5	9.0	9.0	9.2

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Lompoc (NOAA GHCN station USC00045064), about 2 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 →