Weather on December 18

Round Rock, TX

55 Years of Data

Avg High
63°F
Avg Low
40°F
Warmest
2021
71°F avg
Coldest
1975
31°F avg

About This Date

December 18th in Round Rock, TX typically brings mild winter weather, with average highs around 63°F and lows near 40°F. Over 30 years of records, the warmest December 18th was in 2021 (71°F average), while the coldest was 1975 (31°F) — a 40°F range across recorded history. Rain or other precipitation has occurred on about 20% of December 18th dates historically.

Planning for December 18th in Round Rock, TX? Great weather for outdoor activities.

Warming Trend
0.5°F per decade on this date
YearHighLowAvgPrecipSnow
202563°57°60°0.2"
202477°65°71°
202369°34°51°
202256°29°42°
2021warmest76°67°71°0.48"
202063°28°45°
201952°30°41°
201868°38°53°
201757°44°51°0.03"
201674°23°48°
201563°34°48°
201451°46°49°0.28"
201370°37°53°
201270°41°55°
201159°43°51°
201050°33°42°
200954°41°47°0.28"
200853°39°46°0.05"
198278°52°65°
198151°17°34°
198080°50°65°
197964°20°42°
197870°48°59°
197779°39°59°
197665°52°58°
1975coldest38°24°31°
197468°41°55°
197347°
197253°38°45°
197159°32°46°
30 years of data from GEORGETOWN

Browse Weather History

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