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Grants Pass, Oregon climate

Csa Hot-summer Mediterranean

Grants Pass has a seasonal mild-temperate climate (Hot-summer Mediterranean, Köppen Csa). The hottest month is July with an average daily high near 33°C, while the coldest is December averaging around 2°C at night. Precipitation totals about 795 mm a year and is strongly seasonal — December alone averages 166 mm while August barely receives 7 mm.

☀️ Summers

Hot

Highs near 33°C in July.

About 53 days a year above 32 °C

❄️ Winters

Chilly

Lows near 2°C in December.

About 56 freezing nights a year

🌧️ Rain

Moderate rainfall

About 795 mm of rain a year.

Wettest in December

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+0.4 °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

Grants Pass climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	9	12	15	19	23	27	33	33	29	21	12	8
Avg temp (°C)	5	7	9	11	16	19	23	23	19	13	8	5
Avg low (°C)	2	2	3	4	8	10	14	13	9	5	4	2
Precipitation (mm)	129	101	93	59	35	17	9	7	14	53	112	166
Snowfall (cm)	2	0	0	—	—	—	—	—	—	—	—	0

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	9	12	15	19	23	27
Avg temp (°C)	5	7	9	11	16	19
Avg low (°C)	2	2	3	4	8	10
Precipitation (mm)	129	101	93	59	35	17
Snowfall (cm)	2	0	0	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	33	33	29	21	12	8
Avg temp (°C)	23	23	19	13	8	5
Avg low (°C)	14	13	9	5	4	2
Precipitation (mm)	9	7	14	53	112	166
Snowfall (cm)	—	—	—	—	—	0

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	17	14	15	13	8	5	2	2	3	8	15	16
Days with high ≥ 32°C (days)	—	—	—	0.4	3	6	17	18	9	0.6	—	—
Days with low ≤ 0°C (days)	11	11	9	4	0.8	0.1	—	—	0.4	4	6	11
Days with snowfall ≥ 2.5 cm (days)	0.2	0.1	0.1	—	—	—	—	—	—	—	—	0.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	17	14	15	13	8	5
Days with high ≥ 32°C (days)	—	—	—	0.4	3	6
Days with low ≤ 0°C (days)	11	11	9	4	0.8	0.1
Days with snowfall ≥ 2.5 cm (days)	0.2	0.1	0.1	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	2	2	3	8	15	16
Days with high ≥ 32°C (days)	17	18	9	0.6	—	—
Days with low ≤ 0°C (days)	—	—	0.4	4	6	11
Days with snowfall ≥ 2.5 cm (days)	—	—	—	—	—	0.1

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	70	69	70	67	58	45	25	26	34	50	70	72
Clear days (≤ 30% cloud)	5	4	4	5	8	13	21	21	17	11	4	4
Partly cloudy days (30–70%)	8	7	8	7	9	8	6	7	7	9	7	8
Cloudy days (≥ 70%)	19	17	19	18	14	9	3	3	6	11	19	19
Relative humidity (%)	91	88	85	82	79	72	57	50	52	66	84	91
Wind speed (mph)	0.7	0.7	0.7	0.7	0.6	0.6	0.6	0.7	0.8	0.8	0.7	0.7

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	70	69	70	67	58	45
Clear days (≤ 30% cloud)	5	4	4	5	8	13
Partly cloudy days (30–70%)	8	7	8	7	9	8
Cloudy days (≥ 70%)	19	17	19	18	14	9
Relative humidity (%)	91	88	85	82	79	72
Wind speed (mph)	0.7	0.7	0.7	0.7	0.6	0.6

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	25	26	34	50	70	72
Clear days (≤ 30% cloud)	21	21	17	11	4	4
Partly cloudy days (30–70%)	6	7	7	9	7	8
Cloudy days (≥ 70%)	3	3	6	11	19	19
Relative humidity (%)	57	50	52	66	84	91
Wind speed (mph)	0.6	0.7	0.8	0.8	0.7	0.7

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Grants Pass (NOAA GHCN station USC00353445), 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 →