McLeod Farmstead · Photo: Bill Fitzpatrick · CC BY-SA 3.0Winter nights in Seabrook are milder than in 89% of U.S. towns
In July the day’s top temperature is typically 91°. Seasons differ by 51°, from the coldest nights to the warmest afternoons. Summer afternoons here are warmer than in 82% of U.S. towns. Tender plants can go out after about February 28; in half of years the first frost comes by December 3.
A year in Seabrook at a glance
Each month’s typical high and low, and what it brings.
What stands out about Seabrook’s climate
Compared with towns across the U.S., with Seabrook’s place in South Carolina beside it.
What a year in Seabrook feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 279 frost-free days a year
In half of years the last 32° night comes by February 28 and the first by December 3. Frost and day counts come from NOAA’s station at Beaufort Mcas, SC, 4 miles from the town’s center, at about the same height.
The 2023 USDA map puts Seabrook’s center in zone 9a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 21°. 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 49 inches of rain a year
August is the wettest month and November the driest. Rain falls on about 118 days a year. Snow is rare: about 0.0" in a normal year at Beaufort Mcas, SC, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Seabrook
40% of the work is heating, so air conditioning is the bigger bill. Months averaging under 55° run from December through February.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Beaufort Mcas, SC.
Living with Seabrook’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
279 frost-free days in zone 9a. The last frost comes by Feb 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 Dec 3.
Months with highs of 62–84° and lows of 40° or more: February, March, April, May, October and November.
Parks & trails →Of the yearly building losses FEMA expects in Seabrook from natural hazards, hurricanes are the largest share (69%); heat waves, cold waves, winter storms and ice storms together are 3%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Seabrook and its neighbors
Every town next door is within a degree of Seabrook in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Seabrook’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 |
|---|---|---|---|---|
| Seabrook, SC | 40° | 91° | 49" | 0.0" |
| Adel, GA | 39° | 91° | 50" | 0.0" |
| Macclenny, FL | 41° | 92° | 52" | 0.0" |
| Rusk, TX | 38° | 93° | 49" | 0.1" |
| Phenix City, AL | 36° | 92° | 51" | 0.0" |
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 Seabrook averaged 1.1° warmer than the 1900s. The biggest change is in December (+2.0°).
A smaller shift than in 68% 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 Seabrook compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Seabrook’s place among South Carolina’s.
Seabrook weather by month
Highs, lows and precipitation from NOAA’s grid at Seabrook’s center; snow, wet days and snow on the ground from Beaufort Mcas, SC. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 60° | 40° | 3.4" | 0.0" | 9 | 0 | 45° – 56° |
| February | 63° | 43° | 3.2" | 0.0" | 9 | 0 | 46° – 62° |
| March | 69° | 49° | 3.5" | 0.0" | 9 | 0 | 52° – 66° |
| April | 76° | 56° | 3.3" | 0.0" | 9 | 0 | 61° – 71° |
| May | 83° | 64° | 3.2" | 0.0" | 8 | 0 | 69° – 79° |
| June | 88° | 71° | 5.4" | 0.0" | 13 | 0 | 75° – 84° |
| July | 91° | 74° | 5.9" | 0.0" | 13 | 0 | 81° – 86° |
| August | 89° | 74° | 6.4" | 0.0" | 13 | 0 | 79° – 84° |
| September | 85° | 70° | 4.6" | 0.0" | 10 | 0 | 74° – 81° |
| October | 77° | 59° | 3.9" | 0.0" | 8 | 0 | 65° – 74° |
| November | 68° | 49° | 2.7" | 0.0" | 8 | 0 | 54° – 64° |
| December | 62° | 43° | 3.3" | 0.0" | 10 | 0 | 44° – 64° |
| Year | 76° | 58° | 48.8" | 0.0" | 118 | 0 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 44° to 64°. August is the most reliable, staying within 5°.
Where Seabrook’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 Seabrook’s center.
- Snow: Beaufort Mcas, SC.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Beaufort Mcas, SC, 4 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 Seabrook’s climate
What is the weather like in Seabrook?
A typical July afternoon reaches 91°, a January night drops to 40°, and snow is almost unheard of. Milder January nights than 89% of U.S. towns; hotter July afternoons than 82% of U.S. towns.
How cold does it get in Seabrook in winter?
January nights average 40°. About 17 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 45°.
How much snow does Seabrook get?
About 0.0 inches in a normal winter at Beaufort Mcas, SC, so most winters see none.
How hot does it get in Seabrook?
July, with a typical high of 91° and a low of 74°. About 73 days a year reach 90° and 2 reach 100° (Beaufort Mcas, SC).
When is the first and last frost in Seabrook?
In half of years the last spring frost (32°) comes by February 28 and the first fall frost by December 3, about 279 frost-free days, at Beaufort Mcas, SC.
What growing zone is Seabrook in?
Zone 9a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 21°.
What is the best time of year to visit Seabrook?
By one simple rule (highs of 62–84° and lows of 40° or more), February, March, April, May, October and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Seabrook getting warmer?
Yes: 1991–2020 averaged 1.1° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 68% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Seabrook.
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.