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Twin Falls, Idaho climate

BSk Cold semi-arid

Twin Falls has a seasonal cool-temperate climate (Cold semi-arid, Köppen BSk). The hottest month is July with an average daily high near 33°C, while the coldest is December averaging around −5°C at night. Precipitation totals about 234 mm a year and is strongly seasonal — December alone averages 33 mm while July barely receives 4 mm.

☀️ Summers

Hot

Highs near 33°C in July.

About 40 days a year above 32 °C

❄️ Winters

Cold

Lows near −5°C in December.

About 122 freezing nights a year

🌧️ Rain

Very dry

About 234 mm of rain a year.

Wettest in December

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+1.3 °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

Twin Falls climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	5	8	13	17	23	27	33	33	27	19	10	4
Avg temp (°C)	0	2	7	10	15	19	24	23	18	11	4	−1
Avg low (°C)	−5	−4	0	2	7	11	15	13	9	3	−2	−5
Precipitation (mm)	26	20	22	26	31	17	4	9	8	18	19	33

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	5	8	13	17	23	27
Avg temp (°C)	0	2	7	10	15	19
Avg low (°C)	−5	−4	0	2	7	11
Precipitation (mm)	26	20	22	26	31	17

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	33	33	27	19	10	4
Avg temp (°C)	24	23	18	11	4	−1
Avg low (°C)	15	13	9	3	−2	−5
Precipitation (mm)	4	9	8	18	19	33

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	7	6	7	7	7	5	2	2	3	4	6	8
Days with high ≥ 32°C (days)	—	—	—	0.2	1	5	17	14	3	0.2	—	—
Days with low ≤ 0°C (days)	25	21	18	8	2	0.0	—	—	0.5	7	18	22
Days with snowfall ≥ 2.5 cm (days)	1	0.6	0.4	0.1	—	—	—	—	—	0.2	0.5	1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	7	6	7	7	7	5
Days with high ≥ 32°C (days)	—	—	—	0.2	1	5
Days with low ≤ 0°C (days)	25	21	18	8	2	0.0
Days with snowfall ≥ 2.5 cm (days)	1	0.6	0.4	0.1	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	2	2	3	4	6	8
Days with high ≥ 32°C (days)	17	14	3	0.2	—	—
Days with low ≤ 0°C (days)	—	—	0.5	7	18	22
Days with snowfall ≥ 2.5 cm (days)	—	—	—	0.2	0.5	1

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	66	66	63	59	57	44	34	35	37	47	59	68
Clear days (≤ 30% cloud)	4	4	6	6	7	12	16	16	15	11	6	3
Partly cloudy days (30–70%)	11	10	11	12	12	11	10	10	9	10	11	11
Cloudy days (≥ 70%)	16	14	15	12	12	8	5	5	6	10	13	16
Relative humidity (%)	79	72	63	59	52	44	31	28	35	48	64	77
Wind speed (m/s)	3.0	3.1	3.1	3.1	2.7	2.7	2.4	2.3	2.4	2.7	2.8	2.9

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	66	66	63	59	57	44
Clear days (≤ 30% cloud)	4	4	6	6	7	12
Partly cloudy days (30–70%)	11	10	11	12	12	11
Cloudy days (≥ 70%)	16	14	15	12	12	8
Relative humidity (%)	79	72	63	59	52	44
Wind speed (m/s)	3.0	3.1	3.1	3.1	2.7	2.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	34	35	37	47	59	68
Clear days (≤ 30% cloud)	16	16	15	11	6	3
Partly cloudy days (30–70%)	10	10	9	10	11	11
Cloudy days (≥ 70%)	5	5	6	10	13	16
Relative humidity (%)	31	28	35	48	64	77
Wind speed (m/s)	2.4	2.3	2.4	2.7	2.8	2.9

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Twin Falls-kmvt (NOAA GHCN station USC00109293), 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 →