McKinney, TX climate
McKinney has mild winters and hot summers. A typical July afternoon reaches 94°, a January night drops to 34°, and about 3 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in McKinney feels like
Winter
Spring
Summer
Fall
McKinney weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 55° | 34° | 2.6" | 0.2" | 7 | 0 | 40° – 52° |
| February | 59° | 38° | 2.8" | 1.3" | 8 | 1 | 40° – 58° |
| March | 67° | 46° | 3.9" | 0.4" | 8 | 0 | 51° – 63° |
| April | 74° | 53° | 3.7" | 0 | 7 | 0 | 59° – 70° |
| May | 82° | 62° | 4.8" | 0 | 9 | 0 | 68° – 77° |
| June | 90° | 70° | 3.7" | 0 | 8 | 0 | 77° – 85° |
| July | 94° | 74° | 2.3" | 0 | 5 | 0 | 80° – 89° |
| August | 95° | 73° | 2.3" | 0 | 6 | 0 | 78° – 91° |
| September | 88° | 66° | 3.2" | 0 | 6 | 0 | 73° – 84° |
| October | 77° | 55° | 4.8" | 0 | 7 | 0 | 61° – 71° |
| November | 66° | 44° | 3.2" | 0.1" | 6 | 0 | 49° – 60° |
| December | 56° | 36° | 3.3" | 0.6" | 7 | 1 | 39° – 51° |
| Year | 75° | 54° | 40.7" | 2.6" | 84 | 2 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in McKinney
McKinney gets 41 inches of rain and melted snow a year. October is the wettest month and July the driest. Rain or snow falls on about 84 days a year.
About 241 frost-free days a year
In half of years the last 32° night comes by March 17 and the first one by November 15. That leaves about 241 frost-free days for gardens, longer than 89% of U.S. towns.
Heating and cooling a home in McKinney
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In McKinney, 50% of that work is heating and 50% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
McKinney and its neighbors
McKinney borders 6 towns with climate data. January nights across them vary by 1.3°. Melissa has the coldest January nights (34°) and Prosper the hottest July afternoons (95°). McKinney’s January low is 34° and its July high 94°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How McKinney compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in McKinney averaged 0.8° warmer than the 1900s. The biggest change is in January (+1.7°). The shift is smaller than in 83% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at McKinney’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 40° to 58°. June is the most reliable, staying within 8°.
Common questions about McKinney’s climate
What is the coldest month in McKinney?
January, with a typical high of 55° and a low of 34°.
What is the hottest month in McKinney?
August, with a typical high of 95° and a low of 73°. About 88 days a year reach 90°.
How much snow does McKinney get?
About 3 inches in a normal winter, most of it in February.
When is the first frost in McKinney?
In half of years the first 32° night comes by November 15, and the last spring frost by March 17.
What is the rainiest month in McKinney?
October, with 4.8 inches of rain and melted snow. The year totals 41 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for McKinney itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Frisco, TX (7 mi, snow) and Mckinney Municipal Airport, TX (4 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.