Weather without surprises: Plainfield keeps close to the norm for U.S. towns
The coldest hours of a January night bottom out at 22° on average. A year here swings 64° from midwinter lows to midsummer highs. Radiators earn their keep from November to March, the months that average under 50°.
A year in Plainfield at a glance
Each month’s typical high and low, and what it brings.
What stands out about Plainfield’s climate
Compared with towns across the U.S., with Plainfield’s place in Pennsylvania beside it.
What a year in Plainfield feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 177 frost-free days a year
In half of years the last 32° night comes by April 23 and the first by October 18. Frost and day counts come from NOAA’s station at Carlisle Wtp, PA, 5 miles from the town’s center, at about the same height.
The 2023 USDA map puts Plainfield’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 31 inches of snow a winter
Snow, measured at Pine Grove Furnace, PA, falls mostly in January. Precipitation (rain plus melted snow) adds up to 44 inches a year; September is the wettest month and February the driest. Rain or snow falls on about 129 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Plainfield
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 Carlisle Wtp, PA.
Living with Plainfield’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
177 frost-free days in zone 7a. The last frost comes by Apr 23 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 18.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October. 1.2 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Plainfield from natural hazards, river flooding is the largest share (71%); heat waves, cold waves, winter storms and ice storms together are 5%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Plainfield and similar climates
TownRatings has no climate map of the towns around Plainfield yet.
Climates most like Plainfield’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 |
|---|---|---|---|---|
| Plainfield, PA | 22° | 86° | 44" | 31" |
| Newport, KY | 24° | 86° | 45" | 23" |
| Groveport, OH | 22° | 86° | 41" | 28" |
| Nyack, NY | 22° | 86° | 47" | 33" |
| Lawrenceburg, IN | 23° | 86° | 45" | 23" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Plainfield averaged 1.5° warmer than the 1900s. The biggest change is in December (+2.9°).
A bigger shift than in 60% 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 Plainfield compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Plainfield’s place among Pennsylvania’s.
Plainfield weather by month
Highs, lows and precipitation from NOAA’s grid at Plainfield’s center; snow, wet days and snow on the ground from Pine Grove Furnace, PA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 38° | 22° | 3.0" | 10.4" | 10 | 11 | 21° – 38° |
| February | 42° | 24° | 2.6" | 8.0" | 9 | 13 | 21° – 40° |
| March | 51° | 31° | 3.7" | 6.5" | 11 | 7 | 35° – 51° |
| April | 64° | 41° | 3.8" | 0.3" | 13 | 0 | 48° – 57° |
| May | 73° | 50° | 4.0" | 0.0" | 13 | 0 | 56° – 67° |
| June | 82° | 60° | 4.1" | 0.0" | 12 | 0 | 67° – 74° |
| July | 86° | 64° | 4.1" | 0.0" | 11 | 0 | 71° – 80° |
| August | 84° | 63° | 3.7" | 0.0" | 11 | 0 | 69° – 77° |
| September | 77° | 56° | 4.5" | 0.0" | 10 | 0 | 63° – 70° |
| October | 65° | 44° | 3.7" | 0.3" | 10 | 0 | 50° – 61° |
| November | 53° | 35° | 3.2" | 0.8" | 8 | 1 | 38° – 49° |
| December | 43° | 27° | 3.4" | 4.4" | 10 | 6 | 26° – 45° |
| Year | 63° | 43° | 43.8" | 30.7" | 129 | 38 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 21° to 40°. June is the most reliable, staying within 7°.
Where Plainfield’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 Plainfield’s center.
- Snow: Pine Grove Furnace, PA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Carlisle Wtp, PA, 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 Plainfield’s climate
What is the weather like in Plainfield?
A typical July afternoon reaches 86°, a January night drops to 22°, and about 31 inches of snow falls in a normal winter. Milder January nights than 53% of U.S. towns; hotter July afternoons than 58% of U.S. towns.
How cold does it get in Plainfield in winter?
January nights average 22°. About 127 nights a year reach 32° or below and 2 reach 0° or below. In the coldest January of the last 30 years the month averaged 21°.
How much snow does Plainfield get?
About 31 inches in a normal winter at Pine Grove Furnace, PA, most of it in January, with snow on the ground about 38 days a year.
How hot does it get in Plainfield?
July, with a typical high of 86° and a low of 64°. About 24 days a year reach 90° (Carlisle Wtp, PA).
When is the first and last frost in Plainfield?
In half of years the last spring frost (32°) comes by April 23 and the first fall frost by October 18, about 177 frost-free days, at Carlisle Wtp, PA.
What growing zone is Plainfield 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 Plainfield?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Plainfield getting warmer?
Yes: 1991–2020 averaged 1.5° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 60% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Plainfield.
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.