Plano climate

Name: Plano
Address: US

Plano is warmest in August, with average highs of 34 °C, and coldest in January, when nights average 3.6 °C. May is the wettest month (142 mm) and July the driest (49 mm). Figures are 1991–2020 climate normals.

Across a full year Plano averages 1,079 mm of rain, 182 days above 25 °C and 18 days below freezing.

United States · 203 m elevation · population 283,558 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month August 34 °C
Coldest month January 3.6 °C
Driest month July 49 mm
Wettest month May 142 mm
Least cloud August 37 % cloud
Hottest on record July 42 °C
Coldest on record January -11 °C

What to expectPlano through the year

Plano has a clear annual cycle: average daily highs run from 13 °C in January to 34 °C in August, a swing of 22 °C in mean temperature across the year.

Counted across a normal year, 182 days a year reach 25 °C, 106 of them reach 30 °C, 18 nights drop below freezing. The warmest reading in the 1991–2020 record is 42 °C, in July.

Rain is strongly seasonal. May averages 142 mm against 49 mm in July — 2.9 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	13.2 °C	73 mm	50 %
February	15.6 °C	76 mm	53 %
March	19.7 °C	101 mm	53 %
April	24.0 °C	111 mm	49 %
May	27.6 °C	142 mm	54 %
June	31.5 °C	94 mm	45 %
July	34.0 °C	49 mm	39 %
August	34.0 °C	57 mm	37 %
September	30.4 °C	84 mm	38 %
October	25.0 °C	105 mm	39 %
November	18.5 °C	93 mm	45 %
December	13.8 °C	95 mm	50 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C	Days below 0 °C
January	13.2 °C	3.6 °C	7.5 °C	26.7 °C	-10.8 °C	0	0	7
February	15.6 °C	5.6 °C	9.7 °C	30.8 °C	-10.7 °C	1	0	4
March	19.7 °C	9.4 °C	13.8 °C	30.9 °C	-8.1 °C	4	0	1
April	24.0 °C	13.6 °C	18.2 °C	36.3 °C	1.3 °C	13	1	0
May	27.6 °C	18.3 °C	22.6 °C	36.8 °C	6.0 °C	25	7	0
June	31.5 °C	22.5 °C	26.8 °C	38.8 °C	15.1 °C	30	22	0
July	34.0 °C	24.8 °C	29.2 °C	41.9 °C	18.3 °C	31	29	0
August	34.0 °C	24.9 °C	29.3 °C	41.7 °C	16.6 °C	31	28	0
September	30.4 °C	21.1 °C	25.4 °C	41.3 °C	9.7 °C	28	17	0
October	25.0 °C	15.3 °C	19.6 °C	35.0 °C	-1.4 °C	17	4	0
November	18.5 °C	9.4 °C	13.3 °C	32.7 °C	-6.2 °C	3	0	1
December	13.8 °C	5.0 °C	8.7 °C	29.0 °C	-6.9 °C	0	0	5

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	73 mm	7	10 h/day	50 %	69 %	22 km/h
February	76 mm	8	11 h/day	53 %	69 %	23 km/h
March	101 mm	9	12 h/day	53 %	68 %	24 km/h
April	111 mm	8	13 h/day	49 %	67 %	25 km/h
May	142 mm	11	14 h/day	54 %	71 %	23 km/h
June	94 mm	9	14 h/day	45 %	68 %	20 km/h
July	49 mm	6	14 h/day	39 %	61 %	18 km/h
August	57 mm	5	13 h/day	37 %	59 %	16 km/h
September	84 mm	7	12 h/day	38 %	63 %	17 km/h
October	105 mm	8	11 h/day	39 %	64 %	20 km/h
November	93 mm	7	10 h/day	45 %	68 %	22 km/h
December	95 mm	7	10.0 h/day	50 %	70 %	22 km/h

How Plano compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Plano	34 °C	3.6 °C	1,079 mm	182
Dallas · United States	35 °C	4.1 °C	1,043 mm	191
Arlington · United States	35 °C	4.0 °C	988 mm	192
Fort Worth · United States	35 °C	3.9 °C	950 mm	194

Where Plano ranks

Ranking	Position	Value
The warmest places in North America in July	33rdof 50	34 °C
The warmest places in North America in August	34thof 50	34 °C

Planning a trip? See the best time to visit Plano.

QuestionsCommon questions about Plano’s climate

When is the best time to visit Plano?

That depends on what you want, so the honest answer is a comparison rather than a single month. April, May, October sit closest to 20 °C on average, August is the warmest month and July the driest. The month-by-month table above has the full picture.

How hot does Plano get?

In August, the warmest month, daily highs average 34 °C. About 106 days a year pass 30 °C. The highest value in the 1991–2020 record is 42 °C.

How cold does it get in winter?

Nights average 3.6 °C in January, the coldest month. A normal year has 18 nights below freezing.

Which month is wettest in Plano?

May, averaging 142 mm over 11 days with rain. The driest month is July with 49 mm. The year as a whole averages 1,079 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Plano rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.