Photo: Mr. Matté (if there is an issue with this image, contact me using this image's Commons talk page, my Commons user talk page, or my English Wikipedia user talk page; I'll know about it a lot faster) · CC BY-SA 4.0Wet weather: 49 inches of rain and melted snow a year in Caernarvon Township, more than in 78% of U.S. towns
January nights here settle around 22°. Precipitation peaks in September and eases off in February. Warm coats and heating bills mark the months from November to March, when means dip under 50°.
A year in Caernarvon Township at a glance
Each month’s typical high and low, and what it brings.
What stands out about Caernarvon Township’s climate
Compared with towns across the U.S., with Caernarvon Township’s place in Pennsylvania beside it.
What a year in Caernarvon Township feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 193 frost-free days a year
In half of years the last 32° night comes by April 16 and the first by October 27. Frost and day counts come from NOAA’s station at Hopewell Morgantown, PA, 0.5 miles from the town’s center, at about the same height.
The 2023 USDA map puts Caernarvon Township’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 2°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 26 inches of snow a winter
Snow, measured at Morgantown, PA, falls mostly in February. Precipitation (rain plus melted snow) adds up to 49 inches a year; September is the wettest month and February the driest. Rain or snow falls on about 119 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Caernarvon Township
87% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Hopewell Morgantown, PA.
Living with Caernarvon Township’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
193 frost-free days in zone 7a. The last frost comes by Apr 16 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 27.
Months with highs of 62–84° and lows of 40° or more: May, June, August, September and October. 4.2 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Caernarvon Township from natural hazards, river flooding is the largest share (58%); heat waves, cold waves, winter storms and ice storms together are 11%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Caernarvon Township and its neighbors
Every town next door is within a degree of Caernarvon Township in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Caernarvon Township’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Caernarvon Township, PA | 22° | 85° | 49" | 26" |
| Clarksburg, WV | 23° | 85° | 47" | 24" |
| Elsmere, KY | 23° | 85° | 47" | 23" |
| Fairfield, CT | 22° | 84° | 49" | 34" |
| Delhi Hills, OH | 23° | 86° | 46" | 23" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Caernarvon Township averaged 1.8° warmer than the 1900s. The biggest change is in December (+3.4°).
A bigger shift than in 81% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Caernarvon Township compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Caernarvon Township’s place among Pennsylvania’s.
Caernarvon Township weather by month
Highs, lows and precipitation from NOAA’s grid at Caernarvon Township’s center; snow, wet days and snow on the ground from Morgantown, PA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 39° | 22° | 3.4" | 4.7" | 10 | 21° – 38° |
| February | 42° | 24° | 2.8" | 12.4" | 10 | 22° – 40° |
| March | 50° | 30° | 4.2" | 3.3" | 9 | 34° – 49° |
| April | 63° | 40° | 3.7" | 0.3" | 10 | 47° – 56° |
| May | 72° | 50° | 3.8" | 0.0" | 12 | 57° – 67° |
| June | 80° | 59° | 4.5" | 0.0" | 11 | 66° – 73° |
| July | 85° | 64° | 4.8" | 0.0" | 10 | 70° – 78° |
| August | 83° | 62° | 4.4" | 0.0" | 10 | 68° – 76° |
| September | 76° | 55° | 5.0" | 0.0" | 8 | 63° – 70° |
| October | 65° | 43° | 4.4" | 0.5" | 10 | 49° – 60° |
| November | 53° | 34° | 3.5" | 1.2" | 8 | 38° – 48° |
| December | 43° | 27° | 4.1" | 3.9" | 11 | 26° – 46° |
| Year | 63° | 42° | 48.5" | 26.3" | 119 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 26° to 46°. June is the most reliable, staying within 7°.
Where Caernarvon Township’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Caernarvon Township’s center.
- Snow: Morgantown, PA (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Hopewell Morgantown, PA, 0.5 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Caernarvon Township’s climate
What is the weather like in Caernarvon Township?
A typical July afternoon reaches 85°, a January night drops to 22°, and about 26 inches of snow falls in a normal winter. Colder January nights than 51% of U.S. towns; cooler July afternoons than 51% of U.S. towns.
How cold does it get in Caernarvon Township in winter?
January nights average 22°. About 121 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 21°.
How much snow does Caernarvon Township get?
About 26 inches in a normal winter at Morgantown, PA, most of it in February.
How hot does it get in Caernarvon Township?
July, with a typical high of 85° and a low of 64°. About 12 days a year reach 90° (Hopewell Morgantown, PA).
When is the first and last frost in Caernarvon Township?
In half of years the last spring frost (32°) comes by April 16 and the first fall frost by October 27, about 193 frost-free days, at Hopewell Morgantown, PA.
What growing zone is Caernarvon Township in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 2°.
What is the best time of year to visit Caernarvon Township?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Caernarvon Township getting warmer?
Yes: 1991–2020 averaged 1.8° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 81% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Caernarvon Township.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.