The highest day temperature in January 2026 was 50°F. The lowest night temperature was -13°F. The average values for day and night temperatures during January were 29.0°F и 18.5°F respectivly.

You can expect various weather conditions during January. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in January for Allentown is 1.1 in.

The average wind speed in January is 8.0 mph. It makes January one of the most windy months of the year for Allentown.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Allentown in January is 5.1 hours.