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Catalina Foothills, Arizona climate

BSh Hot semi-arid

Catalina Foothills has a seasonal warm-temperate climate (Hot semi-arid, Köppen BSh). The hottest month is July with an average daily high near 101°F, while the coldest is December averaging around 36°F at night. Precipitation totals about 12 inches a year and is strongly seasonal — August alone averages 2.6 inches while May barely receives 0.14 inches.

☀️ Summers

Very hot

Highs near 101°F in July.

About 160 days a year above 90 °F

❄️ Winters

Chilly

Lows near 36°F in December.

About 25 freezing nights a year

🌧️ Rain

Fairly dry

About 12 in of rain a year.

Wettest in August

⛅ Sky & trend

Fairly sunny

More sun than cloud through the year.

+2.1 °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

Catalina Foothills climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	68	71	78	85	93	102	101	100	96	88	77	67
Avg temp (°F)	53	55	61	67	75	85	88	87	82	71	60	52
Avg low (°F)	37	40	45	50	58	68	75	74	68	55	43	36
Precipitation (in)	1.1	1.0	0.6	0.3	0.1	0.3	2.3	2.6	1.0	0.6	0.7	1.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	68	71	78	85	93	102
Avg temp (°F)	53	55	61	67	75	85
Avg low (°F)	37	40	45	50	58	68
Precipitation (in)	1.1	1.0	0.6	0.3	0.1	0.3

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	101	100	96	88	77	67
Avg temp (°F)	88	87	82	71	60	52
Avg low (°F)	75	74	68	55	43	36
Precipitation (in)	2.3	2.6	1.0	0.6	0.7	1.1

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	4	4	3	1	1	1.0	6	8	4	3	2	3
Days with high ≥ 90°F (days)	—	—	0.7	8	22	29	30	29	27	13	1	—
Days with low ≤ 32°F (days)	8	4	0.8	—	—	—	—	—	—	0.0	2	10

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	4	4	3	1	1	1.0
Days with high ≥ 90°F (days)	—	—	0.7	8	22	29
Days with low ≤ 32°F (days)	8	4	0.8	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	6	8	4	3	2	3
Days with high ≥ 90°F (days)	30	29	27	13	1	—
Days with low ≤ 32°F (days)	—	—	—	0.0	2	10

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	39	43	37	27	25	23	55	52	33	26	31	38
Clear days (≤ 30% cloud)	15	13	16	19	21	21	7	8	17	21	18	14
Partly cloudy days (30–70%)	8	8	9	8	7	6	12	14	9	6	7	10
Cloudy days (≥ 70%)	7	8	7	3	3	3	11	10	5	4	5	7
Relative humidity (%)	47	46	39	30	23	18	36	43	39	34	37	46
Wind speed (mph)	5.3	5.2	5.2	5.7	5.8	5.7	4.7	4.0	4.7	5.1	5.4	5.3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	39	43	37	27	25	23
Clear days (≤ 30% cloud)	15	13	16	19	21	21
Partly cloudy days (30–70%)	8	8	9	8	7	6
Cloudy days (≥ 70%)	7	8	7	3	3	3
Relative humidity (%)	47	46	39	30	23	18
Wind speed (mph)	5.3	5.2	5.2	5.7	5.8	5.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	55	52	33	26	31	38
Clear days (≤ 30% cloud)	7	8	17	21	18	14
Partly cloudy days (30–70%)	12	14	9	6	7	10
Cloudy days (≥ 70%)	11	10	5	4	5	7
Relative humidity (%)	36	43	39	34	37	46
Wind speed (mph)	4.7	4.0	4.7	5.1	5.4	5.3

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Tucson Camp Ave Exp (NOAA GHCN station USC00028796), 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 →