Climate in Fullerton
The typical year in Fullerton (California), from 1991-2020 normals. For what's happening now, see the current forecast ; a month ahead — the 30-day outlook .
Annual mean temp
18.8°C
average across 12 months
Annual precipitation
442 mm
yearly total
Warmest month
Aug
⌀ max 30°C
Coldest month
Feb
⌀ min 8°C
Temperatures by month typical high (orange) · typical low (blue)
Precipitation by month monthly totals across the year
The short version
Region California
Region California
Latitude 33.8703°N
Annual mean 18.8°C
Annual precipitation 442 mm
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Precip NEXRAD · NOAA Temp Wind Clouds Terrain
Source · 1991-2020 normals