Irwinton, Georgia climate: Normal weather by month, frost dates and records
Irwinton's normal year runs from 36°F January nights to 92°F July afternoons, with 46.8 inches of precipitation and less than an inch of snow (0.2 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 18.2°C, January lows of 2°C, July highs of 33°C, 1,188 mm of precipitation a year.
- NOAA stationIrwinton (4 mi WNW)
- Station IDUSC00094594
- Location32.83°N 83.24°W
- Elevation515 ft (157 m)
- Population538
On October 23, the normal high in Irwinton is 75°F and the normal low 52°F, and the chance of measurable rain or snow is 19%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Irwinton.
- Jan 58° 36°
- Feb 61° 39°
- Mar 69° 45°
- Apr 76° 52°
- May 84° 61°
- Jun 89° 68°
- Jul 92° 72°
- Aug 90° 71°
- Sep 86° 66°
- Oct 77° 55°
- Nov 67° 44°
- Dec 60° 39°
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 Irwinton each month?
July is the warmest month, with normal highs of 92°F; January the coldest, with normal lows of 36°F. The most precipitation falls in August (4.83 in), the least in October (2.54 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 58°F | 36°F | 46.6°F | 4.31 | 9 | <1 | 11 | 10 h 10 min |
| February | 61°F | 39°F | 49.9°F | 4.24 | 8 | <1 | 8 | 11 h |
| March | 69°F | 45°F | 57.0°F | 4.33 | 8 | <1 | 3 | 12 h |
| April | 76°F | 52°F | 63.9°F | 3.66 | 7 | <1 | <1 | 13 h |
| May | 84°F | 61°F | 72.3°F | 3.10 | 6 | 6 | <1 | 13 h 50 min |
| June | 89°F | 68°F | 78.6°F | 4.16 | 10 | 16 | <1 | 14 h 20 min |
| July | 92°F | 72°F | 81.9°F | 4.37 | 9 | 25 | <1 | 14 h 10 min |
| August | 90°F | 71°F | 80.3°F | 4.83 | 10 | 20 | <1 | 13 h 20 min |
| September | 86°F | 66°F | 76.0°F | 3.76 | 7 | 8 | <1 | 12 h 30 min |
| October | 77°F | 55°F | 65.8°F | 2.54 | 6 | <1 | <1 | 11 h 30 min |
| November | 67°F | 44°F | 55.5°F | 2.79 | 6 | <1 | 3 | 10 h 30 min |
| December | 60°F | 39°F | 49.4°F | 4.68 | 7 | <1 | 10 | 10 h |
| Year (annual) | 76°F | 54°F | 64.8°F | 46.77 | 92 | 75 | 35 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 14°C | 2°C | 8.1°C | 109 mm |
| February | 16°C | 4°C | 9.9°C | 108 mm |
| March | 21°C | 7°C | 13.9°C | 110 mm |
| April | 24°C | 11°C | 17.7°C | 93 mm |
| May | 29°C | 16°C | 22.4°C | 79 mm |
| June | 32°C | 20°C | 25.9°C | 106 mm |
| July | 33°C | 22°C | 27.7°C | 111 mm |
| August | 32°C | 21°C | 26.8°C | 123 mm |
| September | 30°C | 19°C | 24.4°C | 96 mm |
| October | 25°C | 13°C | 18.8°C | 65 mm |
| November | 20°C | 6°C | 13.1°C | 71 mm |
| December | 16°C | 4°C | 9.7°C | 119 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00094594; 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 Irwinton?
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 (6).
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 USC00094594.
When is the last frost in Irwinton?
In Irwinton, the last spring frost (32°F) comes after March 12 in half of years and after April 1 in one year in ten; the first autumn frost comes before November 19 in half of years and before November 3 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 121 year in 10 after April 1; 9 in 10 after February 18
- First autumn frost, half of years before
- November 191 year in 10 before November 3; 9 in 10 before December 15
NOAA puts the median frost-free season at 255 days, and the season without a hard freeze (28°F) at 285 days.
A hard freeze (28°F) comes after February 25 in half of springs and before December 4 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Irwinton in zone 8b in ZIP code 31042, 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 USC00094594; 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 Irwinton?
In a normal year in Irwinton, 75 days a year reach 90°F (4 of them 100°F or more), 35 nights fall to 32°F or colder and 92 days bring measurable precipitation.
- Days at 90°F or more
- 75a normal year
- Days at 100°F or more
- 4a normal year
- Nights at 32°F or colder
- 35a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 92a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00094594.
How sunny is Irwinton?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Irwinton, 4.7 kWh per square metre a day. May is the sunniest month (82%) and February the cloudiest (72%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 76% | 2.9 |
| February | 72% | 3.5 |
| March | 75% | 4.6 |
| April | 80% | 5.8 |
| May | 82% | 6.3 |
| June | 81% | 6.2 |
| July | 82% | 6.1 |
| August | 80% | 5.5 |
| September | 80% | 4.9 |
| October | 81% | 4.1 |
| November | 80% | 3.2 |
| December | 73% | 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 Irwinton need?
A normal year in Irwinton brings 2,241 heating degree days, 58% fewer than the median U.S. place (5,373), and 2,183 cooling degree days, 2.4 times the median (908). Four months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 5,881 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 570 | 1 |
| February | 425 | 2 |
| March | 265 | 17 |
| April | 103 | 68 |
| May | 10 | 235 |
| June | 0 | 408 |
| July | 0 | 522 |
| August | 0 | 476 |
| September | 2 | 331 |
| October | 79 | 105 |
| November | 300 | 14 |
| December | 487 | 4 |
| Year (annual) | 2,241 | 2,183 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00094594. 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 Irwinton's climate compare?
Irwinton is warmer than 61 of the other 100 places with their own NOAA record in Georgia, and wetter than 9. Across the 7,247 U.S. stations with normals, its annual mean of 64.8°F is warmer than 87%.
In the Köppen classification computed from these normals, Irwinton 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 Irwinton share this climate record?
7 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.
- Gordon, GA1,720 people · 7 mi NW
- Ivey, GA1,009 people · 7 mi NW
- Jeffersonville, GA926 people · 12 mi SW
- McIntyre, GA555 people · 2 mi NE
- Toomsboro, GA376 people · 9 mi E
- Allentown, GA190 people · 17 mi S
- Danville, GA160 people · 15 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.
Questions about Irwinton's climate
What is the coldest month in Irwinton?
January, with a normal high of 58°F and a normal low of 36°F. The warmest is July (92°F by day, 72°F at night).
Does it snow in Irwinton?
Rarely: NOAA's normal is 0.2 inch a year.
What is the rainiest month in Irwinton?
August, with 4.83 in of precipitation in a normal year; the driest is October with 2.54 in.
What plant hardiness zone is Irwinton in?
The USDA's 2023 map puts Irwinton in zone 8b in ZIP code 31042, the nearest ZIP area.
How late can frost come in Irwinton?
In half of years the last 32°F night comes after March 12; in one year in ten it comes after April 1. Waiting until April 1 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Georgia climateThe statewide normals and every place in the state
- Milledgeville, GA17 miles from this station, 63.9°F a year
- Macon, GA26 miles from this station, 65.4°F a year
- Warner Robins, GA27 miles from this station, 65.0°F a year
- Dublin, GA27 miles from this station, 64.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made