Brunswick, Georgia climate: Normal weather by month, frost dates and records
Brunswick's normal year runs from 44°F January nights to 91°F July afternoons, with 45.4 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 20.7°C, January lows of 7°C, July highs of 33°C, 1,153 mm of precipitation a year.
- NOAA stationBrunswick Malcolm McKinnon Airport
- Station IDUSW00013878
- Location31.15°N 81.39°W
- Elevation16 ft (5 m)
- Population15,520
On October 23, the normal high in Brunswick is 77°F and the normal low 61°F, and the chance of measurable rain or snow is 22%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Brunswick.
- Jan 62° 44°
- Feb 65° 47°
- Mar 70° 53°
- Apr 76° 60°
- May 83° 68°
- Jun 88° 74°
- Jul 91° 76°
- Aug 90° 76°
- Sep 86° 73°
- Oct 79° 64°
- Nov 71° 53°
- Dec 64° 47°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Brunswick each month?
July is the warmest month, with normal highs of 91°F; January the coldest, with normal lows of 44°F. The most precipitation falls in September (6.00 in), the least in November (1.91 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 62°F | 44°F | 53.0°F | 3.15 | 8 | <1 | 4 | 10 h 20 min |
| February | 65°F | 47°F | 56.1°F | 2.78 | 8 | <1 | 2 | 11 h |
| March | 70°F | 53°F | 61.7°F | 3.27 | 8 | <1 | <1 | 12 h |
| April | 76°F | 60°F | 68.0°F | 2.82 | 7 | <1 | <1 | 12 h 50 min |
| May | 83°F | 68°F | 75.6°F | 2.29 | 7 | 3 | <1 | 13 h 40 min |
| June | 88°F | 74°F | 81.0°F | 5.76 | 11 | 9 | <1 | 14 h 10 min |
| July | 91°F | 76°F | 83.6°F | 4.19 | 11 | 17 | <1 | 14 h |
| August | 90°F | 76°F | 82.8°F | 5.79 | 13 | 13 | <1 | 13 h 20 min |
| September | 86°F | 73°F | 79.1°F | 6.00 | 11 | 4 | <1 | 12 h 20 min |
| October | 79°F | 64°F | 71.3°F | 4.70 | 8 | <1 | <1 | 11 h 30 min |
| November | 71°F | 53°F | 62.0°F | 1.91 | 7 | <1 | <1 | 10 h 40 min |
| December | 64°F | 47°F | 55.7°F | 2.75 | 8 | <1 | 2 | 10 h 10 min |
| Year (annual) | 77°F | 61°F | 69.2°F | 45.41 | 105 | 47 | 8 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 17°C | 7°C | 11.7°C | 80 mm |
| February | 18°C | 8°C | 13.4°C | 71 mm |
| March | 21°C | 12°C | 16.5°C | 83 mm |
| April | 25°C | 15°C | 20.0°C | 72 mm |
| May | 29°C | 20°C | 24.2°C | 58 mm |
| June | 31°C | 23°C | 27.2°C | 146 mm |
| July | 33°C | 24°C | 28.7°C | 106 mm |
| August | 32°C | 24°C | 28.2°C | 147 mm |
| September | 30°C | 23°C | 26.2°C | 152 mm |
| October | 26°C | 18°C | 21.8°C | 119 mm |
| November | 22°C | 12°C | 16.7°C | 49 mm |
| December | 18°C | 8°C | 13.2°C | 70 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00013878; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Brunswick?
Normal highs sit between 65°F and 85°F in March, April, May, October and November. Of those, April has the fewest days with rain (7).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00013878.
When is the last frost in Brunswick?
In Brunswick, the last spring frost (32°F) comes after February 9 in half of years and after March 6 in one year in ten; the first autumn frost comes before December 26 in half of years and before November 30 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- February 91 year in 10 after March 6; 9 in 10 after January 11
- First autumn frost, half of years before
- December 261 year in 10 before November 30; 9 in 10 before January 19
NOAA puts the median frost-free season at 312 days, and the season without a hard freeze (28°F) at 341 days.
A hard freeze (28°F) comes after January 27 in half of springs and before January 8 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Brunswick in zone 9a in ZIP code 31520. By the map's own method, the average of each year's coldest night over 1991-2020, Brunswick's NOAA station is in zone 9b: the coldest night of a typical year reaches 25°F (30 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Georgia · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00013878; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Brunswick?
In a normal year in Brunswick, 47 days a year reach 90°F, 8 nights fall to 32°F or colder and 105 days bring measurable precipitation.
- Days at 90°F or more
- 47a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 8a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 105a normal year
The highest temperature in this station's record (since 1944) is 104°F, on July 20, 1986; the lowest is 6°F, on January 21, 1985.
The wettest calendar year on that record is 1953, with 73.46 in; the snowiest season is 1989–90, with 4.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USW00013878; records: ACIS (NOAA Regional Climate Centers), station USW00013878. Records use complete months only; a month missing more than three days is left out.
How humid and windy is Brunswick, and how clear are its skies?
The summer (June-August) dew point averages 73°F. The muggiest month is July, with an average dew point of 74°F, above the 65°F at which most people call the air sticky; the driest air comes in January (44°F). April is the windiest month (8.7 mph on average), and April has the most clear or nearly clear hours (73%).
| Month | Dew point | Humidity | Afternoon humidity | Wind | Clear or few clouds | Overcast |
|---|---|---|---|---|---|---|
| January | 44°F | 73% | 57% | 7.7 mph | 61% | 24% |
| February | 48°F | 72% | 57% | 8.2 mph | 63% | 19% |
| March | 55°F | 72% | 58% | 8.3 mph | 66% | 15% |
| April | 61°F | 72% | 59% | 8.7 mph | 73% | 10% |
| May | 69°F | 75% | 64% | 8.7 mph | 64% | 10% |
| June | 73°F | 77% | 66% | 7.8 mph | 68% | 7% |
| July | 74°F | 78% | 68% | 7.8 mph | 67% | 6% |
| August | 73°F | 79% | 69% | 8.1 mph | 63% | 10% |
| September | 68°F | 78% | 67% | 8.2 mph | 60% | 15% |
| October | 57°F | 75% | 59% | 7.4 mph | 70% | 15% |
| November | 51°F | 77% | 61% | 7.0 mph | 68% | 16% |
| December | 45°F | 76% | 61% | 7.4 mph | 65% | 19% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013878. Monthly averages of all hours; afternoon humidity at 3 p.m. local standard time; sky as the share of hours NOAA's observations rate clear or few clouds (a dash where NOAA publishes no sky value).
How sunny is Brunswick?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Brunswick, 4.7 kWh per square metre a day. May is the sunniest month (83%) and February the cloudiest (73%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 76% | 3.0 |
| February | 73% | 3.6 |
| March | 78% | 4.8 |
| April | 82% | 6.0 |
| May | 83% | 6.5 |
| June | 79% | 6.2 |
| July | 82% | 6.2 |
| August | 79% | 5.6 |
| September | 77% | 4.8 |
| October | 79% | 4.1 |
| November | 80% | 3.3 |
| December | 74% | 2.6 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Brunswick need?
A normal year in Brunswick brings 1,308 heating degree days, 76% fewer than the median U.S. place (5,373), and 2,848 cooling degree days, 3.1 times the median (908). Two months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 7,170 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 380 | 6 |
| February | 263 | 12 |
| March | 152 | 48 |
| April | 42 | 132 |
| May | 3 | 333 |
| June | 0 | 479 |
| July | 0 | 575 |
| August | 0 | 550 |
| September | 0 | 425 |
| October | 23 | 218 |
| November | 145 | 55 |
| December | 302 | 15 |
| Year (annual) | 1,308 | 2,848 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00013878. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Brunswick been warmer than normal lately?
2025 averaged 69.9°F, 0.7°F above the 1991-2020 normal of 69.2°F. 4 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 69.7°F | +0.5°F | 46.07 |
| 2022 | 70.3°F | +1.1°F | 48.91 |
| 2023 | 72.3°F | +3.1°F | – |
| 2025 | 69.9°F | +0.7°F | – |
Over 72 complete years from 1946 to 2025, the station's annual mean temperature rose at a fitted 3.6°F per century (+0.20°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USW00013878; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Brunswick's climate compare?
Brunswick is warmer than 99 of the other 100 places with their own NOAA record in Georgia, and wetter than 3. Across the 7,247 U.S. stations with normals, its annual mean of 69.2°F is warmer than 94%.
In the Köppen classification computed from these normals, Brunswick is Cfa: temperate, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Brunswick share this climate record?
5 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- St. Simons, GA16,026 people · 2 mi N
- Country Club Estates, GA9,575 people · 6 mi NW
- Dock Junction, GA8,786 people · 8 mi NW
- Sterling, GA1,849 people · 12 mi NW
- Jekyll Island, GA1,078 people · 6 mi S
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Brunswick's other NOAA stations record?
2 more NOAA stations keep 1991-2020 normals in or near Brunswick. This page uses Brunswick Malcolm McKinnon Airport; the others differ by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Brunswick (23 mi S) USW00063856 | 24 mi S | 25 ft | 67.8°F | 43°F | 89°F | 47.2 | – | February 19 |
| Brunswick station USC00091340 | 7 mi W | 13 ft | 68.5°F | 44°F | 90°F | 50.3 | 0 | February 8 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Brunswick's climate
What is the coldest month in Brunswick?
January, with a normal high of 62°F and a normal low of 44°F. The warmest is July (91°F by day, 76°F at night).
Does it snow in Brunswick?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month in Brunswick?
September, with 6.00 in of precipitation in a normal year; the driest is November with 1.91 in.
What plant hardiness zone is Brunswick in?
The USDA's 2023 map puts Brunswick in zone 9a in ZIP code 31520. By the same method at Brunswick's NOAA station, the coldest night of a typical year reaches 25°F (30 years, 1991-2020): zone 9b.
How late can frost come in Brunswick?
In half of years the last 32°F night comes after February 9; in one year in ten it comes after March 6. Waiting until March 6 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Brunswick in OctoberThis month day by day, its records and recent years
- Georgia climateThe statewide normals and every place in the state
- Sapelo Island, GA18 miles from this station, 68.4°F a year
- Woodbine, GA23 miles from this station, 66.4°F a year
- Nahunta, GA32 miles from this station, 65.5°F a year
- Fernandina Beach, FL34 miles from this station, 70.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made