West Caln, PA climate
West Caln has chilly winters and warm summers, with plenty of rain. A typical July afternoon reaches 85°, a January night drops to 22°, and about 23 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in West Caln feels like
Winter
Spring
Summer
Fall
West Caln weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 39° | 22° | 3.5" | 5.8" | 11 | 8 | 21° – 38° |
| February | 42° | 23° | 2.8" | 8.8" | 9 | 10 | 22° – 40° |
| March | 50° | 30° | 4.3" | 3.7" | 11 | 5 | 34° – 49° |
| April | 62° | 40° | 3.9" | 0.4" | 11 | 0 | 47° – 56° |
| May | 72° | 50° | 3.8" | 0 | 12 | 0 | 56° – 67° |
| June | 80° | 59° | 4.6" | 0 | 10 | 0 | 66° – 73° |
| July | 85° | 64° | 4.9" | 0 | 11 | 0 | 70° – 78° |
| August | 83° | 62° | 4.5" | 0 | 9 | 0 | 68° – 76° |
| September | 76° | 55° | 5.0" | 0 | 9 | 0 | 63° – 69° |
| October | 65° | 44° | 4.5" | 0.4" | 10 | 0 | 50° – 60° |
| November | 53° | 34° | 3.5" | 0.6" | 9 | 1 | 38° – 48° |
| December | 43° | 27° | 4.2" | 3.6" | 11 | 4 | 27° – 46° |
| Year | 62° | 42° | 49.5" | 23.3" | 122 | 27 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in West Caln
West Caln gets 50 inches of rain and melted snow a year. September is the wettest month and February the driest. Rain or snow falls on about 122 days a year. Snow covers the ground about 27 days of the year.
About 190 frost-free days a year
In half of years the last 32° night comes by April 19 and the first one by October 25. That leaves about 190 frost-free days for gardens, longer than 64% of U.S. towns.
Heating and cooling a home in West Caln
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In West Caln, 85% of that work is heating and 15% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
West Caln and its neighbors
West Caln borders 6 towns with climate data. January nights across them vary by 0.6°. Honey Brook has the coldest January nights (22°) and Valley the hottest July afternoons (85°). West Caln’s January low is 22° and its July high 85°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How West Caln compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in West Caln averaged 1.8° warmer than the 1900s. The biggest change is in December (+3.5°). The shift is larger than in 87% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at West Caln’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 27° to 46°. September is the most reliable, staying within 7°.
Common questions about West Caln’s climate
What is the coldest month in West Caln?
January, with a typical high of 39° and a low of 22°.
What is the hottest month in West Caln?
July, with a typical high of 85° and a low of 64°. About 16 days a year reach 90°.
How much snow does West Caln get?
About 23 inches in a normal winter, most of it in February.
When is the first frost in West Caln?
In half of years the first 32° night comes by October 25, and the last spring frost by April 19.
What is the rainiest month in West Caln?
September, with 5.0 inches of rain and melted snow. The year totals 50 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for West Caln itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Honey Brook 2 Sse, PA (5 mi, snow) and Coatesville 2 W, PA (3 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.