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Weather extremes
How extreme does Norristown's weather get?
The hottest, coldest, wettest and snowiest days Norristown has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.
The four kinds of extreme
The hottest, coldest, wettest and snowiest single days Norristown has recorded — each shown against what a normal day that time of year looks like.
That is about 19°F hotter than a normal July afternoon in Norristown (typical high near 89°F).
The three most extreme on record
About 35°F colder than a normal January night in Norristown (typical low near 23°F).
The three most extreme on record
More rain in a single day than Norristown usually gets in the whole month of October (typical October total about 4.3 in).
The three most extreme on record
Close to a whole typical February's snow in one day (Norristown averages about 11 in across the month).
The three most extreme on record
How hot and cold it gets, month by month
The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.
Norristown's record heat sits well above even a hot day for the season — July's 108°F is about 19°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.
In plain terms
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Norristown (NOAA GHCN station USC00366370), about 1 km from the city centre.