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Denison, Texas climate

Cfa Humid subtropical

Denison has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 93°F, while the coldest is January averaging around 34°F at night. Around 44 inches of precipitation falls each year, peaking in May (5.5 inches) and easing off in January (2.5 inches).

☀️ Summers

Hot

Highs near 93°F in July.

About 72 days a year above 90 °F

❄️ Winters

Chilly

Lows near 34°F in January.

About 42 freezing nights a year

🌧️ Rain

Wet

About 44 in of rain a year.

Wettest in May

⛅ 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

Denison climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	53	57	65	73	80	88	93	93	85	75	63	54
Avg temp (°F)	43	47	55	63	71	79	83	83	76	65	54	45
Avg low (°F)	34	37	45	53	62	70	74	73	66	55	44	36
Precipitation (in)	2.5	2.8	4.0	3.9	5.5	4.5	2.9	2.9	3.4	4.8	3.5	3.6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	53	57	65	73	80	88
Avg temp (°F)	43	47	55	63	71	79
Avg low (°F)	34	37	45	53	62	70
Precipitation (in)	2.5	2.8	4.0	3.9	5.5	4.5

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	93	93	85	75	63	54
Avg temp (°F)	83	83	76	65	54	45
Avg low (°F)	74	73	66	55	44	36
Precipitation (in)	2.9	2.9	3.4	4.8	3.5	3.6

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	6	6	8	7	9	7	5	5	6	7	6	7
Days with high ≥ 90°F (days)	—	0.1	0.0	0.1	2	13	23	23	10	0.8	—	—
Days with low ≤ 32°F (days)	14	10	3	0.4	0.0	—	—	—	—	0.2	3	12
Days with snowfall ≥ 1 in (days)	0.1	0.1	—	—	—	—	—	—	—	—	0.1	0.0

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	6	6	8	7	9	7
Days with high ≥ 90°F (days)	—	0.1	0.0	0.1	2	13
Days with low ≤ 32°F (days)	14	10	3	0.4	0.0	—
Days with snowfall ≥ 1 in (days)	0.1	0.1	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	5	5	6	7	6	7
Days with high ≥ 90°F (days)	23	23	10	0.8	—	—
Days with low ≤ 32°F (days)	—	—	—	0.2	3	12
Days with snowfall ≥ 1 in (days)	—	—	—	—	0.1	0.0

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	55	59	59	56	59	48	41	42	42	44	50	55
Clear days (≤ 30% cloud)	9	7	8	8	8	10	14	12	13	13	10	9
Partly cloudy days (30–70%)	9	8	9	10	9	12	11	12	9	9	9	9
Cloudy days (≥ 70%)	13	13	14	12	14	8	7	7	8	9	11	13
Relative humidity (%)	76	75	74	72	74	70	61	59	64	67	72	76
Wind speed (mph)	7.5	7.9	8.3	8.3	7.4	6.7	6.2	5.7	6.0	6.9	7.4	7.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	55	59	59	56	59	48
Clear days (≤ 30% cloud)	9	7	8	8	8	10
Partly cloudy days (30–70%)	9	8	9	10	9	12
Cloudy days (≥ 70%)	13	13	14	12	14	8
Relative humidity (%)	76	75	74	72	74	70
Wind speed (mph)	7.5	7.9	8.3	8.3	7.4	6.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	41	42	42	44	50	55
Clear days (≤ 30% cloud)	14	12	13	13	10	9
Partly cloudy days (30–70%)	11	12	9	9	9	9
Cloudy days (≥ 70%)	7	7	8	9	11	13
Relative humidity (%)	61	59	64	67	72	76
Wind speed (mph)	6.2	5.7	6.0	6.9	7.4	7.1

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Sherman (NOAA GHCN station USC00418274), about 11 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 →