Weather on December 18

Fontana, CA

55 Years of Data

Avg High
68°F
Avg Low
43°F
Warmest
2024
68°F avg
Coldest
1984
44°F avg

About This Date

December 18th in Fontana, CA typically brings mild winter weather, with average highs around 68°F and lows near 43°F — a 25°F daily swing. Over 54 years of records, the warmest December 18th was in 2024 (68°F average), while the coldest was 1984 (44°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 19% of December 18th dates historically, with the wettest December 18th recording 3.84" of rain. Temperatures on this date have remained relatively stable over the past several decades.

Temperatures on this date have remained relatively stable over the past several decades.

Planning for December 18th in Fontana, CA? Great weather for outdoor activities.

YearHighLowAvgPrecipSnow
202582°49°65°
2024warmest85°51°68°
202371°54°62°0.13"
202262°35°49°
202167°38°52°
202068°45°56°
201963°43°53°
201868°53°61°
201770°38°54°
201665°33°49°
201573°39°56°
201462°48°55°
201372°54°63°
201259°43°51°0.46"
201159°40°49°
201059°54°56°1.22"
200978°45°61°
200854°38°46°0.1"
200757°48°53°0.53"
200658°36°47°
200561°47°54°
200480°42°61°
200381°46°63°
200257°39°48°
200169°39°54°
200075°46°61°
199975°45°60°
199860°49°54°
199763°40°51°0.25"
199670°42°56°
199570°35°52°
199482°36°59°
199260°43°51°0.2"
199161°53°57°
199064°34°49°
198963°39°51°
198855°41°48°0.61"
198767°42°54°
198668°37°53°
198580°43°61°
1984coldest53°36°44°1.27"
198363°41°52°
198276°39°57°
198173°42°58°
198069°40°54°
197981°38°59°
197849°47°48°3.84"
197761°43°52°
197672°39°55°
197572°44°58°
197469°52°60°
197379°45°62°
197276°50°63°
197166°48°57°
54 years of data from FONTANA KAISER

Browse Weather History

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

December 18th Weather in Fontana, CA - 55 Years of History