Allentown, PA Weather & Climate Normals
What a normal year in Allentown actually looks like
On the 30-year record NOAA keeps for Allentown, PA, the comfort score comes out to 41/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 4 months a year land in the 55–75°F range this site treats as mild.
How much Allentown's weather actually swings
Average temperatures in Allentown run from 30°F in Jan up to 76°F in Jul, a 45.5°F seasonal swing, one of the widest gaps in this dataset.
Allentown, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 38°F | 22°F | 3.3in | 9.8in |
| Feb | 42°F | 23°F | 2.77in | 10.8in |
| Mar | 51°F | 31°F | 3.63in | 6.3in |
| Apr | 63°F | 40°F | 3.67in | 0.5in |
| May | 74°F | 51°F | 3.65in | 0in |
| Jun | 82°F | 60°F | 4.4in | 0in |
| Jul | 86°F | 65°F | 5.3in | 0in |
| Aug | 84°F | 63°F | 4.56in | 0in |
| Sep | 77°F | 55°F | 4.84in | 0in |
| Oct | 66°F | 44°F | 4.14in | 0.2in |
| Nov | 54°F | 34°F | 3.24in | 0.9in |
| Dec | 43°F | 27°F | 3.86in | 4.6in |
If you're timing a visit, May, Jun, Aug, and Sep are Allentown's mildest stretch; if you're moving there, you should plan around Jul's heat and Jan's cold instead.
How wet Allentown actually gets
Over a typical year, Allentown sees about 47.36in of precipitation a year across roughly 129 days with measurable rain or snow, with 33.1in of snow a year.
Allentown against the rest of the country
Out of 4876 cities scored here, Allentown comes in at 4338; within PA alone it ranks 181 of 193. Population is about 127,138.
Checking the actual forecast
These figures come from Allentown Intl Ap, PA US, the NOAA station 4.2 miles from Allentown, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is