Photo: Ted Kerwin · CC BY 2.0Southport gets about 79 inches of snow a winter, more than 95% of U.S. towns
Peak summer warmth arrives in July, with afternoons near 76°. Its July afternoons stay fresher than in 98% of U.S. towns. The latest 30-year average runs 1.8° warmer than 1901–2000’s, with December up the most. Central heating does most of its work from October to April, in months below 50° on average.
A year in Southport at a glance
Each month’s typical high and low, and what it brings.
What stands out about Southport’s climate
Compared with towns across the U.S., with Southport’s place in Maine beside it.
What a year in Southport feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 175 frost-free days a year
In half of years the last 32° night comes by April 28 and the first by October 21. Frost and day counts come from NOAA’s station at Westport Island, ME, 6 miles from the town’s center, at about the same height.
The 2023 USDA map puts Southport’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −6°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 79 inches of snow a winter
Snow, measured at Newcastle, ME, is heaviest from January through February, about 20 inches a month. Precipitation (rain plus melted snow) adds up to 48 inches a year; October is the wettest month and August the driest. Rain or snow falls on about 142 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Southport
96% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Westport Island, ME.
Living with Southport’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
175 frost-free days in zone 6a. The last frost comes by Apr 28 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 21.
Months with highs of 62–84° and lows of 40° or more: June, July, August and September. 1.2 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Southport from natural hazards, hurricanes are the largest share (30%); heat waves, cold waves, winter storms and ice storms together are 14%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Southport and its neighbors
Every town next door is within a degree of Southport in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Southport’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 |
|---|---|---|---|---|
| Southport, ME | 15° | 76° | 48" | 79" |
| Liberty, NY | 14° | 78° | 53" | 70" |
| Paxton, MA | 15° | 80° | 51" | 73" |
| Bradford, PA | 15° | 80° | 44" | 75" |
| Northfield, VT | 7° | 79° | 44" | 76" |
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 Southport averaged 1.8° warmer than the 1900s. The biggest change is in December (+3.6°).
A bigger shift than in 77% 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 Southport compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Southport’s place among Maine’s.
Southport weather by month
Highs, lows and precipitation from NOAA’s grid at Southport’s center; snow, wet days and snow on the ground from Newcastle, ME. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 31° | 15° | 3.7" | 19.6" | 12 | 25 | 14° – 30° |
| February | 33° | 17° | 3.4" | 20.3" | 11 | 25 | 11° – 31° |
| March | 40° | 25° | 4.2" | 14.1" | 11 | 18 | 26° – 39° |
| April | 51° | 34° | 4.2" | 4.4" | 12 | 2 | 40° – 47° |
| May | 61° | 44° | 3.7" | 0.0" | 14 | 0 | 47° – 57° |
| June | 70° | 53° | 4.2" | 0.0" | 13 | 0 | 59° – 65° |
| July | 76° | 59° | 3.3" | 0.0" | 12 | 0 | 63° – 70° |
| August | 75° | 59° | 3.2" | 0.0" | 10 | 0 | 64° – 70° |
| September | 68° | 52° | 4.1" | 0.0" | 10 | 0 | 57° – 65° |
| October | 57° | 42° | 5.1" | 0.3" | 12 | 0 | 46° – 56° |
| November | 47° | 32° | 4.5" | 3.5" | 12 | 2 | 34° – 44° |
| December | 37° | 22° | 4.5" | 16.5" | 13 | 15 | 23° – 37° |
| Year | 54° | 38° | 48.2" | 78.7" | 142 | 88 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 11° to 31°. August is the most reliable, staying within 6°.
Where Southport’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 Southport’s center.
- Snow: Newcastle, ME.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Westport Island, ME, 6 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 Southport’s climate
What is the weather like in Southport?
A typical July afternoon reaches 76°, a January night drops to 15°, and about 79 inches of snow falls in a normal winter. Colder January nights than 85% of U.S. towns; cooler July afternoons than 98% of U.S. towns.
How cold does it get in Southport in winter?
January nights average 15°. About 148 nights a year reach 32° or below and 8 reach 0° or below. In the coldest January of the last 30 years the month averaged 14°.
How much snow does Southport get?
About 79 inches in a normal winter at Newcastle, ME, heaviest from January through February, about 20 inches a month, with snow on the ground about 88 days a year.
How hot does it get in Southport?
July, with a typical high of 76°. 90° days are rare: none in a normal year at Westport Island, ME.
When is the first and last frost in Southport?
In half of years the last spring frost (32°) comes by April 28 and the first fall frost by October 21, about 175 frost-free days, at Westport Island, ME.
What growing zone is Southport in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −6°.
What is the best time of year to visit Southport?
By one simple rule (highs of 62–84° and lows of 40° or more), June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Southport getting warmer?
Yes: 1991–2020 averaged 1.8° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 77% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Southport.
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.