Climate averages 1991–2020

McKinney weather
in January.

A cool, moderately wet month: the coolest and the 3rd driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 12.2°C Daytime mean, January

Average low 3.0°C Night-time mean, January

Rainfall 70 mm 7 days with ≥1 mm

Daylight 10 h Sunrise to sunset, per day

January is a cool month in McKinney: daytime highs average 12.2°C and nights cool to about 3.0°C. By daytime temperature it is the coolest month of the year.

Expect about 70 mm of rain on roughly 7 days, which makes January a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 13 min on an average January day.

The nearest other city in this atlas is Allen (12 km away). In January its highs average 12.5°C, about as warm as McKinney, with 70 mm of rain.

Among the 498 cities listed in the United States, McKinney ranks 227th of 498 for the warmest January highs and joint 219th of 498 for the driest January (rainfall, lowest first). The mean January high of those 498 cities is 9.5°C; McKinney is 2.8°C warmer than that mean.

From January to February, average highs rise by 2.4°C to 14.7°C, and monthly rainfall rises from 70 mm to 74 mm.

The annual picture

January in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

McKinney climate table

1991–2020

Monthly climate averages for McKinney, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January, selected	12.2°C3.0°C	3.0°C	70	6.8	10.210 h
February	14.7°C5.0°C	5.0°C	74	7.6	11.011 h
March	18.8°C8.9°C	8.9°C	105	9.4	12.012 h
April	23.1°C13.1°C	13.1°C	118	9.1	13.013 h
May	27.1°C18.1°C	18.1°C	144	11.5	13.914 h
June	31.2°C22.4°C	22.4°C	91	9.1	14.314 h
July	33.8°C24.8°C	24.8°C	50	6.2	14.114 h
August	33.9°C24.8°C	24.8°C	50	5.8	13.413 h
September	30.0°C20.9°C	20.9°C	78	6.8	12.412 h
October	24.4°C14.9°C	14.9°C	104	7.9	11.411 h
November	17.9°C8.9°C	8.9°C	94	7.2	10.510 h
December	13.1°C4.3°C	4.3°C	94	7.2	10.010 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

January in nearby cities

Distance from McKinney

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for McKinney) is explained once on the McKinney year overview and on the Sources, method and limits page.