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Roseburg, Oregon climate

Csa Hot-summer Mediterranean

Roseburg has a seasonal mild-temperate climate (Hot-summer Mediterranean, Köppen Csa). The hottest month is July with an average daily high near 31°C, while the coldest is December averaging around 3°C at night. Precipitation totals about 856 mm a year and is strongly seasonal — December alone averages 160 mm while August barely receives 8 mm.

☀️ Summers

Hot

Highs near 31°C in July.

About 40 days a year above 32 °C

❄️ Winters

Chilly

Lows near 3°C in December.

About 27 freezing nights a year

🌧️ Rain

Moderate rainfall

About 856 mm of rain a year.

Wettest in December

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+0.8 °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

Roseburg climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	10	13	16	18	23	26	31	31	28	21	13	10
Avg temp (°C)	6	8	10	12	16	19	22	22	19	14	9	6
Avg low (°C)	2	3	4	5	8	11	14	13	10	7	5	3
Precipitation (mm)	134	89	96	78	52	25	8	8	22	63	122	160

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	10	13	16	18	23	26
Avg temp (°C)	6	8	10	12	16	19
Avg low (°C)	2	3	4	5	8	11
Precipitation (mm)	134	89	96	78	52	25

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	31	31	28	21	13	10
Avg temp (°C)	22	22	19	14	9	6
Avg low (°C)	14	13	10	7	5	3
Precipitation (mm)	8	8	22	63	122	160

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	17	15	17	14	9	5	2	2	4	10	16	18
Days with high ≥ 32°C (days)	—	—	—	0.3	2	4	13	13	7	0.6	—	—
Days with low ≤ 0°C (days)	7	6	4	0.6	0.0	—	—	—	—	0.7	2	6
Days with snowfall ≥ 2.5 cm (days)	—	—	—	—	—	—	—	—	—	—	—	0.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	17	15	17	14	9	5
Days with high ≥ 32°C (days)	—	—	—	0.3	2	4
Days with low ≤ 0°C (days)	7	6	4	0.6	0.0	—
Days with snowfall ≥ 2.5 cm (days)	—	—	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	2	2	4	10	16	18
Days with high ≥ 32°C (days)	13	13	7	0.6	—	—
Days with low ≤ 0°C (days)	—	—	—	0.7	2	6
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 (%)	74	75	73	72	65	56	36	36	43	59	76	77
Clear days (≤ 30% cloud)	3	3	3	4	6	9	16	16	13	8	2	2
Partly cloudy days (30–70%)	7	6	8	7	8	9	9	9	8	9	7	7
Cloudy days (≥ 70%)	21	19	20	20	17	13	6	6	9	14	21	22
Relative humidity (%)	92	90	88	85	82	78	66	59	59	71	87	93
Wind speed (mph)	0.2	0.2	0.2	0.2	0.1	0.1	0.1	0.2	0.3	0.3	0.3	0.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	74	75	73	72	65	56
Clear days (≤ 30% cloud)	3	3	3	4	6	9
Partly cloudy days (30–70%)	7	6	8	7	8	9
Cloudy days (≥ 70%)	21	19	20	20	17	13
Relative humidity (%)	92	90	88	85	82	78
Wind speed (mph)	0.2	0.2	0.2	0.2	0.1	0.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	36	36	43	59	76	77
Clear days (≤ 30% cloud)	16	16	13	8	2	2
Partly cloudy days (30–70%)	9	9	8	9	7	7
Cloudy days (≥ 70%)	6	6	9	14	21	22
Relative humidity (%)	66	59	59	71	87	93
Wind speed (mph)	0.1	0.2	0.3	0.3	0.3	0.2

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Roseburg (NOAA GHCN station USC00357331), about 1 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 →