Photo: J. Passepartout · CC BY-SA 4.0July in Hartsville stays fresher than in 95% of U.S. towns
January mornings start at about 14°. Winter nights are cold: in January they are colder than in 88% of U.S. towns. December has warmed most since 1901–2000, part of a 1.0° rise. Comfortable outdoor weather lasts from May to September, with highs of 68–79°.
A year in Hartsville at a glance
Each month’s typical high and low, and what it brings.
What stands out about Hartsville’s climate
Compared with towns across the U.S., with Hartsville’s place in New York beside it.
What a year in Hartsville feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 135 frost-free days a year
In half of years the last 32° night comes by May 18 and the first by October 1. Frost and day counts come from NOAA’s station at Alfred, NY, 7 miles from the town’s center, at about the same height.
The 2023 USDA map puts Hartsville’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −10°. 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 61 inches of snow a winter
Snow, measured at Whitesville 1n, NY, falls mostly in January. Precipitation (rain plus melted snow) adds up to 38 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 160 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Hartsville
96% 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 Alfred, NY.
Living with Hartsville’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
135 frost-free days in zone 6a. The last frost comes by May 18 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 1.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 2.4 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Hartsville from natural hazards, river flooding is the largest share (87%); heat waves, cold waves, winter storms and ice storms together are 3%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Hartsville and its neighbors
Hornellsville the hottest July afternoons (82°, 3° 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 Hartsville’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 |
|---|---|---|---|---|
| Hartsville, NY | 14° | 79° | 38" | 61" |
| Cadillac, MI | 12° | 80° | 35" | 74" |
| Bellevue, WI | 11° | 79° | 33" | 56" |
| Milton, VT | 10° | 80° | 40" | 50" |
| Hanover, NH | 9° | 80° | 42" | 61" |
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 Hartsville averaged 1.0° warmer than the 1900s. The biggest change is in December (+2.6°).
A smaller shift than in 80% 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 Hartsville compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Hartsville’s place among New York’s.
Hartsville weather by month
Highs, lows and precipitation from NOAA’s grid at Hartsville’s center; snow, wet days and snow on the ground from Whitesville 1n, NY. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 31° | 14° | 2.4" | 14.9" | 16 | 20 | 12° – 32° |
| February | 33° | 15° | 2.1" | 13.4" | 12 | 18 | 10° – 33° |
| March | 42° | 22° | 2.5" | 11.5" | 14 | 13 | 24° – 44° |
| April | 55° | 32° | 3.1" | 1.7" | 14 | 1 | 37° – 49° |
| May | 68° | 43° | 3.5" | 0.1" | 14 | 0 | 48° – 61° |
| June | 75° | 52° | 4.0" | 0.0" | 13 | 0 | 60° – 67° |
| July | 79° | 56° | 3.8" | 0.0" | 12 | 0 | 63° – 71° |
| August | 78° | 54° | 3.7" | 0.0" | 12 | 0 | 62° – 70° |
| September | 70° | 48° | 3.6" | 0.0" | 12 | 0 | 56° – 64° |
| October | 59° | 37° | 3.8" | 0.4" | 14 | 0 | 43° – 54° |
| November | 46° | 29° | 2.8" | 5.8" | 14 | 5 | 32° – 44° |
| December | 35° | 20° | 2.6" | 13.3" | 14 | 15 | 18° – 39° |
| Year | 56° | 35° | 37.8" | 61.1" | 160 | 71 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 10° to 33°. August is the most reliable, staying within 7°.
Where Hartsville’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 Hartsville’s center.
- Snow: Whitesville 1n, NY.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Alfred, NY, 7 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 Hartsville’s climate
What is the weather like in Hartsville?
A typical July afternoon reaches 79°, a January night drops to 14°, and about 61 inches of snow falls in a normal winter. Colder January nights than 88% of U.S. towns; cooler July afternoons than 95% of U.S. towns.
How cold does it get in Hartsville in winter?
January nights average 14°. About 170 nights a year reach 32° or below and 15 reach 0° or below. In the coldest January of the last 30 years the month averaged 12°.
How much snow does Hartsville get?
About 61 inches in a normal winter at Whitesville 1n, NY, most of it in January, with snow on the ground about 71 days a year.
How hot does it get in Hartsville?
July, with a typical high of 79° and a low of 56°. About 5 days a year reach 90° (Alfred, NY).
When is the first and last frost in Hartsville?
In half of years the last spring frost (32°) comes by May 18 and the first fall frost by October 1, about 135 frost-free days, at Alfred, NY.
What growing zone is Hartsville in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −10°.
What is the best time of year to visit Hartsville?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Hartsville getting warmer?
Yes: 1991–2020 averaged 1.0° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 80% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Hartsville.
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.