December weather in McKinney, TX
The average temperature in McKinney in December is 46.5°F (35.8°F–57.1°F). Average precipitation: 3.49 inches.
December is a winter month in McKinney, and is cooler than the annual average of 65°F. Daily temperatures swing about 21.3°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 9h 49m. For travel, December is cool.
Avg High
57.1°F
Avg Low
35.8°F
Precipitation
3.49 in
Daylight
9h 49m
December records in McKinney
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 80.1°F (2012) | 21.2°F (2006) | 0.76 in (2009) |
| December 2 | 81.0°F (2012) | 21.0°F (2005) | 0.59 in (2009) |
| December 3 | 86.0°F (2005) | 27.0°F (2004) | 1.02 in (2011) |
| December 4 | 80.1°F (2017) | 18.1°F (2006) | 1.51 in (2011) |
| December 5 | 78.1°F (1998) | 21.0°F (2005) | 0.79 in (2011) |
| December 6 | 75.9°F (1998) | 17.1°F (2005) | 1.04 in (2013) |
| December 7 | 81.0°F (2007) | 19.2°F (2013) | 0.89 in (2024) |
| December 8 | 79.0°F (2007) | 15.1°F (2005) | 0.73 in (2018) |
| December 9 | 79.0°F (2021) | 6.1°F (2005) | 1.07 in (2002) |
| December 10 | 81.0°F (2021) | 18.0°F (2005) | 1.43 in (2022) |
| December 11 | 75.9°F (2015) | 17.2°F (2012) | 1.73 in (1999) |
| December 12 | 73.0°F (2015) | 18.1°F (2012) | 1.31 in (1999) |
| December 13 | 72.0°F (2017) | 21.2°F (2010) | 1.68 in (2015) |
| December 14 | 75.9°F (2008) | 19.9°F (2004) | 0.94 in (2007) |
| December 15 | 80.1°F (2021) | 15.1°F (2004) | 0.64 in (2023) |
| December 16 | 75.9°F (2006) | 22.1°F (2008) | 2.70 in (2001) |
| December 17 | 78.1°F (2021) | 21.0°F (2003) | 0.35 in (2014) |
| December 18 | 75.0°F (2012) | 15.3°F (2016) | 0.79 in (1998) |
| December 19 | 75.9°F (2012) | 12.2°F (2016) | 2.55 in (2017) |
| December 20 | 79.0°F (2025) | 22.1°F (2009) | 1.02 in (2006) |
| December 21 | 82.0°F (2010) | 19.2°F (2008) | 1.43 in (2013) |
| December 22 | 73.9°F (2003) | 10.2°F (2022) | 0.75 in (2017) |
| December 23 | 81.0°F (2025) | 10.2°F (2022) | 0.67 in (2002) |
| December 24 | 79.0°F (2025) | 16.0°F (2004) | 1.60 in (2023) |
| December 25 | 81.0°F (2021) | 14.0°F (2004) | 2.15 in (2000) |
| December 26 | 84.0°F (2025) | 19.2°F (2012) | 2.83 in (2018) |
| December 27 | 81.0°F (2025) | 19.2°F (2012) | 2.93 in (2015) |
| December 28 | 82.9°F (2025) | 23.2°F (2009) | 0.84 in (2019) |
| December 29 | 72.0°F (1999) | 22.1°F (2007) | 1.36 in (2006) |
| December 30 | 79.0°F (2024) | 23.0°F (2000) | 1.82 in (2002) |
| December 31 | 73.0°F (2004) | 19.2°F (2017) | 3.04 in (2020) |