Cool
Average highs are around 19°C, so pack for cooler days.
December verdict
Rancho Cucamonga, California, United States in December
Weather score37Poor
Poor for holiday weather
Average highs are around 19°C, so pack for cooler days. Sunshine averages 6.8h per day, enough for a balanced month. Rainfall averages 58mm, which is relatively low for holiday planning.
December weather
Monthly averages
Temp
19°C
Rain
58mm
Sun
6.8h
Sea
16°C
Weather score
37
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 58mm, which is relatively low for holiday planning.
Some sun
Sunshine averages 6.8h per day, enough for a balanced month.
Cool sea
Sea temperatures average 16°C, so the water can feel cool.
Map
Weather map
Compare Rancho Cucamonga, California, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
December19°C average high
December has some of the coolest average daytime highs of the year, so pack for fresher conditions.
Warmest monthsJuly to September
This stretch sets the upper range for average daytime heat.
Rain
December58mm average rain
December is wetter than Rancho Cucamonga's yearly average, so flexible plans matter more.
Driest monthsApril to October
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
December6.8 hours average sun
December is one of Rancho Cucamonga's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsJuly to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
December16°C average sea
December is below Rancho Cucamonga's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJuly to October
Sea temperatures are usually near 20°C in this stretch, so swimming comfort is at its strongest.
Weather score
December37 weather score
December is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsJune to September
These months have the strongest weather score in the monthly averages.
Hotels in Rancho Cucamonga, California, United States
Marriott
Aloft Ontario-Rancho CucamongaRancho Cucamonga, California, USA
Courtyard Ontario Rancho CucamongaRancho Cucamonga, California, USA
Fairfield Inn & Suites Ontario Rancho CucamongaRancho Cucamonga, California, USA
Four Points by Sheraton Ontario-Rancho CucamongaRancho Cucamonga, California, USA
City Express By Marriott Rancho CucamongaRancho Cucamonga, California, USA
Residence Inn Ontario Rancho CucamongaRancho Cucamonga, California, USA