Pennsylvania Temperatures

This map is known as an isoline (or isarithmic) map, more specifically, as an isotherm map. Click on any location and its average annual precipitation, averaged over a 30-year period will be displayed. Zoom in to see more precise locations.

Map Legend: Temperature in PA (1981-2010)

Data Explanations

Definition: . . . The temperatures represented by the isolines on the map are the means of all annual means from 1981 to 2010 at each of the weather stations (shown as black dots) visible on the map.

How to read this map: . . . Each isoline represents a line of equal average temperature. Each color shade represents a range of temperatures. The temperature for any location between the labeled isolines is between the upper and lower limits of that color shade, proportional to the distance between those isolines.

Comparative Data:

Temperature Minimum Maximum
Mean Annual Temp.:

Pleasant Mount, Wayne County
42.7 deg.

Marcus Hook, Delaware County
56.3 deg.
Single-Month Average:
    Month & Temp.

Pleasant Mount, Wayne County
January: 18.9 deg.

Marcus Hook, Delaware County
July: 78.7 deg.