Thomaston, Georgia climate: Normal weather by month, frost dates and records
Thomaston's normal year runs from 33°F January nights to 91°F July afternoons, with 50.5 inches of precipitation and less than an inch of snow (0.3 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 17.5°C, January lows of 1°C, July highs of 33°C, 1,282 mm of precipitation a year.
- NOAA stationThomaston (4 mi SE)
- Station IDUSC00098661
- Location32.87°N 84.27°W
- Elevation620 ft (189 m)
- From the center4 miles
- Population9,850
On October 23, the normal high in Thomaston is 77°F and the normal low 49°F, and the chance of measurable rain or snow is 17%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Thomaston.
- Jan 58° 33°
- Feb 61° 36°
- Mar 69° 42°
- Apr 77° 49°
- May 83° 58°
- Jun 88° 66°
- Jul 91° 69°
- Aug 90° 69°
- Sep 86° 63°
- Oct 78° 52°
- Nov 68° 41°
- Dec 60° 36°
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 Thomaston each month?
July is the warmest month, with normal highs of 91°F; January the coldest, with normal lows of 33°F. The most precipitation falls in July (5.40 in), the least in May (2.87 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 58°F | 33°F | 45.6°F | 4.41 | 9 | <1 | 16 | 10 h 10 min |
| February | 61°F | 36°F | 48.5°F | 4.54 | 7 | <1 | 11 | 11 h |
| March | 69°F | 42°F | 55.2°F | 4.99 | 7 | <1 | 4 | 12 h |
| April | 77°F | 49°F | 62.8°F | 4.03 | 6 | 1 | 1 | 13 h |
| May | 83°F | 58°F | 70.7°F | 2.87 | 6 | 5 | <1 | 13 h 50 min |
| June | 88°F | 66°F | 77.2°F | 4.33 | 9 | 12 | <1 | 14 h 20 min |
| July | 91°F | 69°F | 80.1°F | 5.40 | 10 | 19 | <1 | 14 h 10 min |
| August | 90°F | 69°F | 79.5°F | 4.15 | 7 | 18 | <1 | 13 h 20 min |
| September | 86°F | 63°F | 74.6°F | 3.91 | 6 | 7 | <1 | 12 h 30 min |
| October | 78°F | 52°F | 65.0°F | 2.90 | 5 | <1 | <1 | 11 h 30 min |
| November | 68°F | 41°F | 54.8°F | 3.99 | 6 | <1 | 5 | 10 h 30 min |
| December | 60°F | 36°F | 47.6°F | 4.94 | 8 | <1 | 13 | 10 h |
| Year (annual) | 76°F | 51°F | 63.5°F | 50.46 | 88 | 62 | 50 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 14°C | 1°C | 7.6°C | 112 mm |
| February | 16°C | 2°C | 9.2°C | 115 mm |
| March | 20°C | 5°C | 12.9°C | 127 mm |
| April | 25°C | 10°C | 17.1°C | 102 mm |
| May | 28°C | 15°C | 21.5°C | 73 mm |
| June | 31°C | 19°C | 25.1°C | 110 mm |
| July | 33°C | 21°C | 26.7°C | 137 mm |
| August | 32°C | 20°C | 26.4°C | 105 mm |
| September | 30°C | 17°C | 23.7°C | 99 mm |
| October | 26°C | 11°C | 18.3°C | 74 mm |
| November | 20°C | 5°C | 12.7°C | 101 mm |
| December | 15°C | 2°C | 8.7°C | 125 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00098661; 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 Thomaston?
Normal highs sit between 65°F and 85°F in March, April, May, October and November. Of those, October has the fewest days with rain (5).
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 USC00098661.
When is the last frost in Thomaston?
In Thomaston, the last spring frost (32°F) comes after March 23 in half of years and after April 11 in one year in ten; the first autumn frost comes before November 12 in half of years and before October 31 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
- March 231 year in 10 after April 11; 9 in 10 after March 1
- First autumn frost, half of years before
- November 121 year in 10 before October 31; 9 in 10 before November 28
NOAA puts the median frost-free season at 234 days, and the season without a hard freeze (28°F) at 260 days.
A hard freeze (28°F) comes after March 10 in half of springs and before November 26 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Thomaston in zone 8b in ZIP code 30286, the nearest ZIP area.
Frost dates for every NOAA station in Georgia · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00098661; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Thomaston?
In a normal year in Thomaston, 62 days a year reach 90°F (3 of them 100°F or more), 50 nights fall to 32°F or colder and 88 days bring measurable precipitation.
- Days at 90°F or more
- 62a normal year
- Days at 100°F or more
- 3a normal year
- Nights at 32°F or colder
- 50a normal year
- Days that stay below freezing
- 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 88a normal year
The highest temperature in this station's record (since 1955) is 109°F, on June 29, 1978; the lowest is −5°F, on January 21, 1985.
The wettest calendar year on that record is 1971, with 64.47 in; the snowiest season is 1972–73, with 19.3 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00098661; records: ACIS (NOAA Regional Climate Centers), station USC00098661. Records use complete months only; a month missing more than three days is left out.
How sunny is Thomaston?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Thomaston, 4.6 kWh per square metre a day. May is the sunniest month (82%) and February the cloudiest (71%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 75% | 2.9 |
| February | 71% | 3.4 |
| March | 75% | 4.5 |
| April | 79% | 5.7 |
| May | 82% | 6.3 |
| June | 79% | 6.2 |
| July | 81% | 6.0 |
| August | 80% | 5.5 |
| September | 80% | 4.9 |
| October | 80% | 4.1 |
| November | 80% | 3.2 |
| December | 72% | 2.5 |
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 Thomaston need?
A normal year in Thomaston brings 2,463 heating degree days, 54% fewer than the median U.S. place (5,373), and 1,935 cooling degree days, 2.1 times the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 5,500 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 600 | 0 |
| February | 464 | 2 |
| March | 315 | 10 |
| April | 121 | 56 |
| May | 17 | 195 |
| June | 1 | 365 |
| July | 0 | 468 |
| August | 0 | 449 |
| September | 5 | 291 |
| October | 83 | 85 |
| November | 319 | 14 |
| December | 540 | 1 |
| Year (annual) | 2,463 | 1,935 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00098661. 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.
How does Thomaston's climate compare?
Thomaston is warmer than 47 of the other 100 places with their own NOAA record in Georgia, and wetter than 39. Across the 7,247 U.S. stations with normals, its annual mean of 63.5°F is warmer than 84%.
In the Köppen classification computed from these normals, Thomaston 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 Thomaston share this climate record?
10 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.
- Hannahs Mill, GA3,335 people · 7 mi NW
- Reynolds, GA895 people · 23 mi SE
- Woodbury, GA863 people · 20 mi NW
- Sunset Village, GA809 people · 9 mi W
- Roberta, GA792 people · 18 mi SE
- Lincoln Park, GA762 people · 4 mi W
- Salem, GA372 people · 9 mi SE
- Culloden, GA205 people · 10 mi E
- Knoxville, GA103 people · 19 mi SE
- Musella, GA0 people · 14 mi E
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Thomaston's climate
What is the coldest month in Thomaston?
January, with a normal high of 58°F and a normal low of 33°F. The warmest is July (91°F by day, 69°F at night).
Does it snow in Thomaston?
Rarely: NOAA's normal is 0.3 inch a year.
What is the rainiest month in Thomaston?
July, with 5.40 in of precipitation in a normal year; the driest is May with 2.87 in.
What plant hardiness zone is Thomaston in?
The USDA's 2023 map puts Thomaston in zone 8b in ZIP code 30286, the nearest ZIP area.
How late can frost come in Thomaston?
In half of years the last 32°F night comes after March 23; in one year in ten it comes after April 11. Waiting until April 11 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Georgia climateThe statewide normals and every place in the state
- The Rock, GA7 miles from this station, 63.1°F a year
- Talbotton, GA19 miles from this station, 61.5°F a year
- Experiment, GA27 miles from this station, 62.8°F a year
- Macon, GA38 miles from this station, 65.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made