Johnston, IA Weather & Climate Normals
What a normal year in Johnston actually looks like
On the 30-year record NOAA keeps for Johnston, IA, the comfort score comes out to 37/100, weather-driven: Heat, cold, snow, or rainfall here are heavy enough that they shape daily life for a large part of the year. Only 4 months a year land in the 55–75°F range this site treats as mild.
How much Johnston's weather actually swings
Average temperatures in Johnston run from 22°F in Jan up to 75°F in Jul, a 53.6°F seasonal swing, one of the widest gaps in this dataset.
How wet Johnston actually gets
Over a typical year, Johnston sees about 36.16in of precipitation a year across roughly 112 days with measurable rain or snow, with 38in of snow a year.
Johnston against the rest of the country
Out of 4876 cities scored here, Johnston comes in at 4756; within IA alone it ranks 80 of 85. Population is about 25,022.
Checking the actual forecast
These figures come from DES MOINES WSFO-JOHNSTON, IA US, the NOAA station 3.1 miles from Johnston, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why this uses the nearest NOAA station · How the comfort score is calculated