Cool
Average highs are around 12°C, so pack for cooler days.
March verdict
O'Fallon, Illinois, United States in March
Weather score33Poor
Poor for holiday weather
Average highs are around 12°C, so pack for cooler days. Sunshine averages 6.2h per day, enough for a balanced month. Rainfall averages 83mm, so some wet days are possible.
March weather
Monthly averages
Temp
12°C
Rain
83mm
Sun
6.2h
Weather score
33
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 83mm, so some wet days are possible.
Some sun
Sunshine averages 6.2h per day, enough for a balanced month.
Map
Weather map
Compare O'Fallon, Illinois, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
March12°C average high
March is on the cooler side of O'Fallon's year, useful if you prefer less intense daytime heat.
Warmest monthsMay to September
This stretch sets the upper range for average daytime heat.
Rain
March83mm average rain
March sits near O'Fallon's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsJanuary to February and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
March6.2 hours average sun
March is below O'Fallon's yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
March33 weather score
March 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.
