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Sierra Vista, Arizona climate

BSk Cold semi-arid

Sierra Vista has a seasonal mild-temperate climate (Cold semi-arid, Köppen BSk). The hottest month is July with an average daily high near 33°C, while the coldest is January averaging around −1°C at night. Precipitation totals about 330 mm a year and is strongly seasonal — July alone averages 90 mm while May barely receives 5 mm.

☀️ Summers

Hot

Highs near 33°C in July.

About 77 days a year above 32 °C

❄️ Winters

Cold

Lows near −1°C in January.

About 37 freezing nights a year

🌧️ Rain

Fairly dry

About 330 mm of rain a year.

Wettest in July

⛅ Sky & trend

Fairly sunny

More sun than cloud through the year.

−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

Sierra Vista climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	16	18	21	25	29	34	33	32	30	27	21	16
Avg temp (°C)	7	9	12	16	20	25	25	24	22	18	12	8
Avg low (°C)	−1	0	3	6	10	15	17	16	14	8	3	−1
Precipitation (mm)	20	16	12	6	5	14	90	84	33	15	13	22
Snowfall (cm)	1	—	—	—	—	—	—	—	—	—	—	—

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	16	18	21	25	29	34
Avg temp (°C)	7	9	12	16	20	25
Avg low (°C)	−1	0	3	6	10	15
Precipitation (mm)	20	16	12	6	5	14
Snowfall (cm)	1	—	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	33	32	30	27	21	16
Avg temp (°C)	25	24	22	18	12	8
Avg low (°C)	17	16	14	8	3	−1
Precipitation (mm)	90	84	33	15	13	22
Snowfall (cm)	—	—	—	—	—	—

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	3	3	2	1	1	2	11	10	4	2	2	3
Days with high ≥ 32°C (days)	0.0	—	—	0.9	8	22	19	16	10	2	—	—
Days with low ≤ 0°C (days)	12	6	3	0.3	—	—	—	—	—	0.3	3	12
Days with snowfall ≥ 2.5 cm (days)	0.1	0.0	—	—	—	—	—	—	—	—	—	0.0

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	3	3	2	1	1	2
Days with high ≥ 32°C (days)	0.0	—	—	0.9	8	22
Days with low ≤ 0°C (days)	12	6	3	0.3	—	—
Days with snowfall ≥ 2.5 cm (days)	0.1	0.0	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	11	10	4	2	2	3
Days with high ≥ 32°C (days)	19	16	10	2	—	—
Days with low ≤ 0°C (days)	—	—	—	0.3	3	12
Days with snowfall ≥ 2.5 cm (days)	—	—	—	—	—	0.0

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	37	41	34	26	23	26	61	56	35	25	30	36
Clear days (≤ 30% cloud)	16	13	17	20	21	19	5	6	15	21	18	16
Partly cloudy days (30–70%)	8	8	9	8	7	7	12	14	10	7	7	10
Cloudy days (≥ 70%)	7	7	6	3	3	4	14	11	5	3	5	6
Relative humidity (%)	53	49	42	32	26	23	47	53	50	44	46	53
Wind speed (m/s)	2.5	2.7	2.8	3.0	2.9	2.7	2.1	1.8	2.1	2.3	2.4	2.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	37	41	34	26	23	26
Clear days (≤ 30% cloud)	16	13	17	20	21	19
Partly cloudy days (30–70%)	8	8	9	8	7	7
Cloudy days (≥ 70%)	7	7	6	3	3	4
Relative humidity (%)	53	49	42	32	26	23
Wind speed (m/s)	2.5	2.7	2.8	3.0	2.9	2.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	61	56	35	25	30	36
Clear days (≤ 30% cloud)	5	6	15	21	18	16
Partly cloudy days (30–70%)	12	14	10	7	7	10
Cloudy days (≥ 70%)	14	11	5	3	5	6
Relative humidity (%)	47	53	50	44	46	53
Wind speed (m/s)	2.1	1.8	2.1	2.3	2.4	2.4

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Sierra Vista (NOAA GHCN station USC00027880), about 3 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 →