Augusta, Maine climate: Normal weather by month, frost dates and records
Augusta's normal year runs from 12°F January nights to 80°F July afternoons, with 41.8 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.8°C, January lows of −11°C, July highs of 27°C, 1,063 mm of precipitation a year.
- NOAA stationAugusta State Airport
- Station IDUSW00014605
- Location44.32°N 69.80°W
- Elevation350 ft (107 m)
- From the center3 miles
- Population19,168
On October 14, the normal high in Augusta is 59°F and the normal low 41°F, and the chance of measurable rain or snow is 39%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Augusta.
- Jan 29° 12°
- Feb 32° 14°
- Mar 41° 23°
- Apr 54° 34°
- May 66° 45°
- Jun 74° 54°
- Jul 80° 60°
- Aug 79° 59°
- Sep 71° 51°
- Oct 58° 40°
- Nov 46° 30°
- Dec 35° 20°
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 Augusta each month?
July is the warmest month, with normal highs of 80°F; January the coldest, with normal lows of 12°F. The most precipitation falls in October (4.69 in), the least in February (2.32 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 | 29°F | 12°F | 20.4°F | 2.62 | 10 | <1 | 30 | 9 h 10 min |
| February | 32°F | 14°F | 23.2°F | 2.32 | 10 | <1 | 27 | 10 h 30 min |
| March | 41°F | 23°F | 32.0°F | 3.21 | 11 | <1 | 26 | 11 h 50 min |
| April | 54°F | 34°F | 43.8°F | 3.82 | 12 | <1 | 12 | 13 h 20 min |
| May | 66°F | 45°F | 55.3°F | 3.27 | 13 | <1 | <1 | 14 h 40 min |
| June | 74°F | 54°F | 64.2°F | 4.01 | 13 | 1 | <1 | 15 h 30 min |
| July | 80°F | 60°F | 70.1°F | 3.20 | 12 | 2 | <1 | 15 h 10 min |
| August | 79°F | 59°F | 68.9°F | 3.41 | 11 | 1 | <1 | 14 h 10 min |
| September | 71°F | 51°F | 61.0°F | 3.90 | 10 | 1 | <1 | 12 h 40 min |
| October | 58°F | 40°F | 49.2°F | 4.69 | 12 | <1 | 5 | 11 h |
| November | 46°F | 30°F | 38.0°F | 3.95 | 11 | <1 | 19 | 9 h 40 min |
| December | 35°F | 20°F | 27.2°F | 3.44 | 12 | <1 | 28 | 8 h 50 min |
| Year (annual) | 55°F | 37°F | 46.1°F | 41.84 | 137 | 5 | 147 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −2°C | −11°C | −6.4°C | 67 mm |
| February | 0°C | −10°C | −4.9°C | 59 mm |
| March | 5°C | −5°C | 0.0°C | 82 mm |
| April | 12°C | 1°C | 6.6°C | 97 mm |
| May | 19°C | 7°C | 12.9°C | 83 mm |
| June | 24°C | 12°C | 17.9°C | 102 mm |
| July | 27°C | 16°C | 21.2°C | 81 mm |
| August | 26°C | 15°C | 20.5°C | 87 mm |
| September | 22°C | 11°C | 16.1°C | 99 mm |
| October | 14°C | 5°C | 9.6°C | 119 mm |
| November | 8°C | −1°C | 3.3°C | 100 mm |
| December | 2°C | −7°C | −2.7°C | 87 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Gardiner (7 miles away), gets 69 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00014605; 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 Augusta?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, September has the fewest days with rain (10).
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 USW00014605.
When is the last frost in Augusta?
In Augusta, the last spring frost (32°F) comes after April 27 in half of years and after May 7 in one year in ten; the first autumn frost comes before October 16 in half of years and before October 2 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
- April 271 year in 10 after May 7; 9 in 10 after April 15
- First autumn frost, half of years before
- October 161 year in 10 before October 2; 9 in 10 before October 31
NOAA puts the median frost-free season at 172 days, and the season without a hard freeze (28°F) at 197 days.
A hard freeze (28°F) comes after April 15 in half of springs and before October 31 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Augusta in zone 5b in ZIP code 04330. By the map's own method, the average of each year's coldest night over 1991-2020, Augusta's NOAA station is in zone 6a: the coldest night of a typical year reaches −10°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 Maine · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00014605; 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 Augusta?
In a normal year in Augusta, 5 days a year reach 90°F, 147 nights fall to 32°F or colder and 137 days bring measurable precipitation.
- Days at 90°F or more
- 5a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 147a normal year
- Days that stay below freezing
- 57high of 32°F or less
- Days with 0.01 inch of precipitation
- 137a normal year
The highest temperature in this station's record (since 1948) is 100°F, on June 24, 2025; the lowest is −23°F, on February 2, 1962.
The wettest calendar year on that record is 2005, with 57.31 in; the snowiest season is 1995–96, with 132.6 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USW00014605; records: ACIS (NOAA Regional Climate Centers), station USW00014605. Records use complete months only; a month missing more than three days is left out.
How humid and windy is Augusta, and how clear are its skies?
The summer (June-August) dew point averages 58°F. The muggiest month is July, with an average dew point of 60°F; the driest air comes in January (10°F). February is the windiest month (8.7 mph on average), and August has the most clear or nearly clear hours (66%).
| Month | Dew point | Humidity | Afternoon humidity | Wind | Clear or few clouds | Overcast |
|---|---|---|---|---|---|---|
| January | 10°F | 63% | 51% | 7.9 mph | 57% | 31% |
| February | 15°F | 62% | 50% | 8.7 mph | 53% | 36% |
| March | 24°F | 59% | 44% | 8.7 mph | 49% | 37% |
| April | 35°F | 59% | 42% | 8.1 mph | 50% | 34% |
| May | 48°F | 69% | 51% | 7.2 mph | 48% | 32% |
| June | 58°F | 70% | 53% | 6.4 mph | 54% | 23% |
| July | 60°F | 72% | 54% | 5.9 mph | 57% | 20% |
| August | 56°F | 71% | 51% | 6.3 mph | 66% | 17% |
| September | 47°F | 75% | 55% | 6.8 mph | 57% | 28% |
| October | 35°F | 71% | 56% | 7.7 mph | 48% | 38% |
| November | 24°F | 71% | 60% | 7.8 mph | 49% | 38% |
| December | 14°F | 67% | 57% | 8.0 mph | 54% | 35% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014605. 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 Augusta?
Over a year 71% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Augusta, 3.7 kWh per square metre a day. September is the sunniest month (77%) and December the cloudiest (62%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 67% | 1.7 |
| February | 69% | 2.5 |
| March | 70% | 3.7 |
| April | 68% | 4.6 |
| May | 67% | 5.3 |
| June | 68% | 5.6 |
| July | 75% | 5.8 |
| August | 77% | 5.3 |
| September | 77% | 4.2 |
| October | 68% | 2.6 |
| November | 66% | 1.7 |
| December | 62% | 1.3 |
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 Augusta need?
A normal year in Augusta brings 7,278 heating degree days, 35% more than the median U.S. place (5,373), and 428 cooling degree days, 53% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,282 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,381 | 0 |
| February | 1,172 | 0 |
| March | 1,023 | 0 |
| April | 635 | 0 |
| May | 313 | 11 |
| June | 90 | 67 |
| July | 13 | 171 |
| August | 20 | 139 |
| September | 160 | 38 |
| October | 493 | 2 |
| November | 810 | 0 |
| December | 1,170 | 0 |
| Year (annual) | 7,278 | 428 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00014605. 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 Augusta been warmer than normal lately?
2025 averaged 47.4°F, 1.3°F above the 1991-2020 normal of 46.1°F. 4 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 48.5°F | +2.4°F | 35.48 |
| 2023 | 49.3°F | +3.1°F | 52.40 |
| 2024 | 49.8°F | +3.7°F | 37.53 |
| 2025 | 47.4°F | +1.3°F | – |
Over 66 complete years from 1949 to 2025, the station's annual mean temperature rose at a fitted 2.0°F per century (+0.11°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USW00014605; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Augusta's climate compare?
Augusta is warmer than 35 of the other 41 places with their own NOAA record in Maine, and wetter than 7. Across the 7,247 U.S. stations with normals, its annual mean of 46.1°F is warmer than 24%.
In the Köppen classification computed from these normals, Augusta is Dfb: continental, no dry season, warm 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 Augusta share this climate record?
2 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.
- Winthrop, ME6,187 people · 8 mi W
- Hallowell, ME2,619 people · 3 mi SW
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 Augusta's climate
What is the coldest month in Augusta?
January, with a normal high of 29°F and a normal low of 12°F. The warmest is July (80°F by day, 60°F at night).
Does it snow in Augusta?
Yes. NOAA publishes no 1991-2020 snowfall normal for Augusta's NOAA station; the nearest record that keeps one, Gardiner (7 miles away), records 69 inches of snow in a normal year.
What is the rainiest month in Augusta?
October, with 4.69 in of precipitation in a normal year; the driest is February with 2.32 in.
What plant hardiness zone is Augusta in?
The USDA's 2023 map puts Augusta in zone 5b in ZIP code 04330. By the same method at Augusta's NOAA station, the coldest night of a typical year reaches −10°F (30 years, 1991-2020): zone 6a.
How late can frost come in Augusta?
In half of years the last 32°F night comes after April 27; in one year in ten it comes after May 7. Waiting until May 7 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Augusta in OctoberThis month day by day, its records and recent years
- Maine climateThe statewide normals and every place in the state
- Gardiner, ME7 miles from this station, 45.8°F a year
- Waterville, ME16 miles from this station, 45.1°F a year
- Livermore Falls, ME21 miles from this station, 43.2°F a year
- Turner, ME23 miles from this station, 44.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made