Weather on December 21

Round Rock, TX

55 Years of Data

Avg High
64°F
Avg Low
39°F
Warmest
2010
66°F avg
Coldest
1976
34°F avg

About This Date

December 21st in Round Rock, TX typically brings mild winter weather, with average highs around 64°F and lows near 39°F — a 25°F daily swing. Over 30 years of records, the warmest December 21st was in 2010 (66°F average), while the coldest was 1976 (34°F) — a 32°F range across recorded history. Rain or other precipitation has occurred on about 10% of December 21st dates historically, with the wettest December 21st recording 0.91" of rain.

Planning for December 21st in Round Rock, TX? Great weather for outdoor activities.

YearHighLowAvgPrecipSnow
202575°46°61°
202465°35°50°
202370°50°60°0.08"
202248°36°42°
202158°35°46°
202065°35°50°
201949°46°47°0.91"
201863°37°50°
201770°44°57°
201657°33°45°
201565°52°58°
201458°46°52°
201370°41°55°0.46"
201267°31°49°
201158°41°49°
2010warmest76°57°66°
200962°31°46°
200878°35°57°
198274°43°58°
198176°44°60°
198039°31°35°
197970°60°65°
197870°36°53°
197751°36°43°
1976coldest45°23°34°
197560°30°45°
197473°31°52°
197320°
197270°44°57°
197176°43°59°
30 years of data from GEORGETOWN

Browse Weather History

Weather data provided by NOAA Climate Data Online. Not for critical planning.

December 21st Weather in Round Rock, TX - 55 Years of History