Summers in Jacksonville are cooler than in 73% of U.S. towns
Midwinter brings lows of about 20°. July is the wettest month, February the driest. Winter nights are cold: in January they are colder than in 61% of U.S. towns. Homes need heating from November to April, the months averaging under 50°.
A year in Jacksonville at a glance
Each month’s typical high and low, and what it brings.
What stands out about Jacksonville’s climate
Compared with towns across the U.S., with Jacksonville’s place in Pennsylvania beside it.
What a year in Jacksonville feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 157 frost-free days a year
In half of years the last 32° night comes by May 8 and the first by October 13. Frost and day counts come from NOAA’s station at Indiana 3 Se, PA, 10 miles from the town’s center, 140 ft lower.
The 2023 USDA map puts Jacksonville’s center in zone 6b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −4°. 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 29 inches of snow a winter
Snow, measured at Salina 3 W, PA, falls mostly in February. Precipitation (rain plus melted snow) adds up to 45 inches a year; July is the wettest month and February the driest. Rain or snow falls on about 168 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Jacksonville
92% 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 Indiana 3 Se, PA.
Living with Jacksonville’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
157 frost-free days in zone 6b. The last frost comes by May 8 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 13.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October. 0.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Jacksonville from natural hazards, river flooding is the largest share (79%); heat waves, cold waves, winter storms and ice storms together are 6%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Jacksonville and its neighbors
Black Lick Township the hottest July afternoons (84°, 1° warmer). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Jacksonville’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 |
|---|---|---|---|---|
| Jacksonville, PA | 20° | 83° | 45" | 29" |
| Montville, CT | 20° | 83° | 47" | 28" |
| New Castle, IN | 19° | 84° | 44" | 25" |
| New Albany, OH | 20° | 84° | 43" | 28" |
| Hopkinton, RI | 20° | 82° | 47" | 35" |
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 Jacksonville averaged 0.9° warmer than the 1900s. The biggest change is in December (+2.2°).
A smaller shift than in 84% 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 Jacksonville compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Jacksonville’s place among Pennsylvania’s.
Jacksonville weather by month
Highs, lows and precipitation from NOAA’s grid at Jacksonville’s center; snow, wet days and snow on the ground from Salina 3 W, PA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 36° | 20° | 3.4" | 7.1" | 18 | 20° – 37° |
| February | 39° | 21° | 2.7" | 8.2" | 14 | 17° – 39° |
| March | 49° | 28° | 3.6" | 5.5" | 14 | 32° – 49° |
| April | 62° | 38° | 3.9" | 0.3" | 15 | 45° – 55° |
| May | 72° | 47° | 4.1" | 0.0" | 15 | 53° – 66° |
| June | 79° | 56° | 4.6" | 0.0" | 14 | 64° – 70° |
| July | 83° | 60° | 4.7" | 0.0" | 13 | 67° – 75° |
| August | 81° | 59° | 4.2" | 0.0" | 12 | 66° – 74° |
| September | 75° | 52° | 4.0" | 0.0" | 12 | 60° – 69° |
| October | 63° | 41° | 3.3" | 0.0" | 13 | 48° – 58° |
| November | 51° | 32° | 3.4" | 1.8" | 13 | 36° – 47° |
| December | 40° | 25° | 3.4" | 5.7" | 16 | 23° – 44° |
| Year | 61° | 40° | 45.2" | 28.6" | 168 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 17° to 39°. June is the most reliable, staying within 7°.
Where Jacksonville’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 Jacksonville’s center.
- Snow: Salina 3 W, PA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Indiana 3 Se, PA, 10 miles from the town’s center, 140 ft lower; 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 Jacksonville’s climate
What is the weather like in Jacksonville?
A typical July afternoon reaches 83°, a January night drops to 20°, and about 29 inches of snow falls in a normal winter. Colder January nights than 61% of U.S. towns; cooler July afternoons than 73% of U.S. towns.
How cold does it get in Jacksonville in winter?
January nights average 20°. About 131 nights a year reach 32° or below and 4 reach 0° or below. In the coldest January of the last 30 years the month averaged 20°.
How much snow does Jacksonville get?
About 29 inches in a normal winter at Salina 3 W, PA, most of it in February.
How hot does it get in Jacksonville?
July, with a typical high of 83° and a low of 60°. About 8 days a year reach 90° (Indiana 3 Se, PA).
When is the first and last frost in Jacksonville?
In half of years the last spring frost (32°) comes by May 8 and the first fall frost by October 13, about 157 frost-free days, at Indiana 3 Se, PA.
What growing zone is Jacksonville in?
Zone 6b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −4°.
What is the best time of year to visit Jacksonville?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Jacksonville getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 84% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Jacksonville.
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.