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Allen, Texas climate

Cfa Humid subtropical

Allen has a seasonal warm-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 94°F, while the coldest is January averaging around 36°F at night. Around 42 inches of precipitation falls each year, peaking in October (5.3 inches) and easing off in July (2.2 inches).

☀️ Summers

Hot

Highs near 94°F in July.

About 47 days a year above 90 °F

❄️ Winters

Chilly

Lows near 36°F in January.

About 16 freezing nights a year

🌧️ Rain

Wet

About 42 in of rain a year.

Wettest in October

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

−0.5 °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

Allen climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	56	60	69	75	83	90	94	95	87	78	66	57
Avg temp (°F)	46	50	58	65	73	81	85	85	77	67	56	48
Avg low (°F)	36	40	48	55	64	71	75	75	67	56	46	38
Precipitation (in)	2.8	3.4	3.6	3.5	5.2	3.8	2.2	2.5	3.3	5.3	3.0	3.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	56	60	69	75	83	90
Avg temp (°F)	46	50	58	65	73	81
Avg low (°F)	36	40	48	55	64	71
Precipitation (in)	2.8	3.4	3.6	3.5	5.2	3.8

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	94	95	87	78	66	57
Avg temp (°F)	85	85	77	67	56	48
Avg low (°F)	75	75	67	56	46	38
Precipitation (in)	2.2	2.5	3.3	5.3	3.0	3.4

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	8	8	9	8	9	7	5	5	6	8	7	8
Days with high ≥ 90°F (days)	—	—	—	0.2	2	10	13	13	7	1	0.1	—
Days with low ≤ 32°F (days)	5	4	1	0.0	—	—	—	—	—	0.0	1	5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	8	8	9	8	9	7
Days with high ≥ 90°F (days)	—	—	—	0.2	2	10
Days with low ≤ 32°F (days)	5	4	1	0.0	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	5	5	6	8	7	8
Days with high ≥ 90°F (days)	13	13	7	1	0.1	—
Days with low ≤ 32°F (days)	—	—	—	0.0	1	5

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	55	59	58	54	57	47	41	41	41	43	50	56
Clear days (≤ 30% cloud)	10	7	8	9	8	10	13	14	13	14	10	9
Partly cloudy days (30–70%)	9	8	9	10	10	12	12	11	10	9	10	9
Cloudy days (≥ 70%)	13	13	14	12	13	8	6	6	7	9	10	13
Relative humidity (%)	75	75	74	72	73	69	60	57	63	66	72	75
Wind speed (mph)	7.2	7.6	7.9	8.0	7.2	6.5	6.2	5.6	5.7	6.6	7.0	6.9

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	55	59	58	54	57	47
Clear days (≤ 30% cloud)	10	7	8	9	8	10
Partly cloudy days (30–70%)	9	8	9	10	10	12
Cloudy days (≥ 70%)	13	13	14	12	13	8
Relative humidity (%)	75	75	74	72	73	69
Wind speed (mph)	7.2	7.6	7.9	8.0	7.2	6.5

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	41	41	41	43	50	56
Clear days (≤ 30% cloud)	13	14	13	14	10	9
Partly cloudy days (30–70%)	12	11	10	9	10	9
Cloudy days (≥ 70%)	6	6	7	9	10	13
Relative humidity (%)	60	57	63	66	72	75
Wind speed (mph)	6.2	5.6	5.7	6.6	7.0	6.9

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Richardson (NOAA GHCN station USC00417588), about 14 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 →