Fairfield, Ohio climate: Normal weather by month, frost dates and records
Fairfield's normal year runs from 21°F January nights to 87°F July afternoons, with 45.0 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.0°C, January lows of −6°C, July highs of 31°C, 1,144 mm of precipitation a year.
- NOAA stationFairfield
- Station IDUSC00332651
- Location39.35°N 84.59°W
- Elevation575 ft (175 m)
- From the center3 miles
- Population45,094
On October 22, the normal high in Fairfield is 65°F and the normal low 41°F, and the chance of measurable rain or snow is 26%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Fairfield.
- Jan 38° 21°
- Feb 42° 23°
- Mar 53° 31°
- Apr 66° 41°
- May 75° 52°
- Jun 84° 61°
- Jul 87° 65°
- Aug 87° 63°
- Sep 80° 55°
- Oct 67° 43°
- Nov 54° 33°
- Dec 43° 26°
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 Fairfield each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 21°F. The most precipitation falls in April (4.94 in), the least in February (2.95 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 38°F | 21°F | 29.5°F | 3.38 | 9 | <1 | 26 | 9 h 40 min |
| February | 42°F | 23°F | 32.7°F | 2.95 | 8 | <1 | 23 | 10 h 40 min |
| March | 53°F | 31°F | 41.8°F | 3.93 | 10 | <1 | 18 | 11 h 50 min |
| April | 66°F | 41°F | 53.2°F | 4.94 | 11 | <1 | 5 | 13 h 10 min |
| May | 75°F | 52°F | 63.5°F | 4.93 | 12 | 1 | <1 | 14 h 20 min |
| June | 84°F | 61°F | 72.2°F | 4.37 | 10 | 7 | <1 | 15 h |
| July | 87°F | 65°F | 75.9°F | 3.92 | 9 | 13 | <1 | 14 h 40 min |
| August | 87°F | 63°F | 74.7°F | 3.45 | 7 | 11 | <1 | 13 h 50 min |
| September | 80°F | 55°F | 67.5°F | 3.27 | 7 | 4 | <1 | 12 h 30 min |
| October | 67°F | 43°F | 55.1°F | 3.29 | 8 | <1 | 3 | 11 h 10 min |
| November | 54°F | 33°F | 43.1°F | 3.16 | 8 | <1 | 16 | 10 h |
| December | 43°F | 26°F | 34.2°F | 3.45 | 9 | <1 | 23 | 9 h 30 min |
| Year (annual) | 65°F | 43°F | 53.6°F | 45.04 | 109 | 36 | 114 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 3°C | −6°C | −1.4°C | 86 mm |
| February | 6°C | −5°C | 0.4°C | 75 mm |
| March | 12°C | −1°C | 5.4°C | 100 mm |
| April | 19°C | 5°C | 11.8°C | 125 mm |
| May | 24°C | 11°C | 17.5°C | 125 mm |
| June | 29°C | 16°C | 22.3°C | 111 mm |
| July | 31°C | 18°C | 24.4°C | 100 mm |
| August | 30°C | 17°C | 23.7°C | 88 mm |
| September | 27°C | 13°C | 19.7°C | 83 mm |
| October | 20°C | 6°C | 12.8°C | 84 mm |
| November | 12°C | 0°C | 6.2°C | 80 mm |
| December | 6°C | −3°C | 1.2°C | 88 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Cheviot (13 miles away), gets 16 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00332651; 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 Fairfield?
Normal highs sit between 65°F and 85°F in April, May, June, September and October. Of those, September 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 USC00332651.
When is the last frost in Fairfield?
In Fairfield, the last spring frost (32°F) comes after April 19 in half of years and after May 7 in one year in ten; the first autumn frost comes before October 22 in half of years and before October 9 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 191 year in 10 after May 7; 9 in 10 after April 2
- First autumn frost, half of years before
- October 221 year in 10 before October 9; 9 in 10 before November 3
NOAA puts the median frost-free season at 186 days, and the season without a hard freeze (28°F) at 209 days.
A hard freeze (28°F) comes after April 6 in half of springs and before November 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Fairfield in zone 6b in ZIP code 45014. By the map's own method, the average of each year's coldest night over 1991-2020, Fairfield's NOAA station is in zone 6b: the coldest night of a typical year reaches −3°F (27 complete years).
Frost dates for every NOAA station in Ohio · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00332651; 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 Fairfield?
In a normal year in Fairfield, 36 days a year reach 90°F (1 of them 100°F or more), 114 nights fall to 32°F or colder and 109 days bring measurable precipitation.
- Days at 90°F or more
- 36a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 114a normal year
- Days that stay below freezing
- 22high of 32°F or less
- Days with 0.01 inch of precipitation
- 109a normal year
The highest temperature in this station's record (since 1913) is 111°F, on July 24, 1934; the lowest is −23°F, on January 20, 1994.
The wettest calendar year on that record is 2011, with 67.60 in; the snowiest season is 1969–70, with 34.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00332651; records: ACIS (NOAA Regional Climate Centers), station USC00332651. Records use complete months only; a month missing more than three days is left out.
How sunny is Fairfield?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Fairfield, 4.0 kWh per square metre a day. August is the sunniest month (81%) and December the cloudiest (58%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 59% | 1.8 |
| February | 62% | 2.6 |
| March | 65% | 3.6 |
| April | 71% | 4.9 |
| May | 72% | 5.5 |
| June | 78% | 6.2 |
| July | 79% | 6.0 |
| August | 81% | 5.5 |
| September | 79% | 4.6 |
| October | 72% | 3.2 |
| November | 69% | 2.2 |
| December | 58% | 1.5 |
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 Fairfield need?
A normal year in Fairfield brings 5,233 heating degree days, 3% fewer than the median U.S. place (5,373), and 1,118 cooling degree days, 23% more than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,663 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,100 | 0 |
| February | 904 | 0 |
| March | 719 | 2 |
| April | 366 | 12 |
| May | 129 | 82 |
| June | 15 | 229 |
| July | 1 | 340 |
| August | 2 | 301 |
| September | 60 | 133 |
| October | 323 | 18 |
| November | 657 | 0 |
| December | 956 | 0 |
| Year (annual) | 5,233 | 1,118 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00332651. 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 Fairfield been warmer than normal lately?
2025 averaged 54.7°F, 1.1°F above the 1991-2020 normal of 53.6°F. 3 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 54.6°F | +1.0°F | 44.81 |
| 2022 | 52.9°F | −0.7°F | 45.79 |
| 2024 | 56.8°F | +3.2°F | 52.36 |
| 2025 | 54.7°F | +1.1°F | 51.02 |
Over 31 complete years from 1990 to 2025, the station's annual mean temperature rose at a fitted 5.8°F per century (+0.32°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00332651; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Fairfield's climate compare?
Fairfield is warmer than 82 of the other 98 places with their own NOAA record in Ohio, and wetter than 81. Across the 7,247 U.S. stations with normals, its annual mean of 53.6°F is warmer than 55%.
In the Köppen classification computed from these normals, Fairfield is Dfa: continental, 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 Fairfield share this climate record?
11 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.
- Northgate, OH6,585 people · 7 mi S
- New Burlington, OH5,556 people · 6 mi S
- Pleasant Run, OH5,211 people · 4 mi S
- Pleasant Run Farm, OH4,390 people · 4 mi SE
- Greenhills, OH3,699 people · 7 mi SE
- Mount Healthy Heights, OH3,547 people · 5 mi S
- Ross, OH2,715 people · 4 mi SW
- New Baltimore, OH1,257 people · 7 mi SW
- Dunlap, OH1,219 people · 4 mi SW
- Millville, OH652 people · 5 mi NW
- Mount Carmel, IN78 people · 16 mi W
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 Fairfield's climate
What is the coldest month in Fairfield?
January, with a normal high of 38°F and a normal low of 21°F. The warmest is July (87°F by day, 65°F at night).
Does it snow in Fairfield?
Yes. NOAA publishes no 1991-2020 snowfall normal for Fairfield's NOAA station; the nearest record that keeps one, Cheviot (13 miles away), records 16 inches of snow in a normal year.
What is the rainiest month in Fairfield?
April, with 4.94 in of precipitation in a normal year; the driest is February with 2.95 in.
What plant hardiness zone is Fairfield in?
The USDA's 2023 map puts Fairfield in zone 6b in ZIP code 45014. By the same method at Fairfield's NOAA station, the coldest night of a typical year reaches −3°F (27 years, 1991-2020): zone 6b.
How late can frost come in Fairfield?
In half of years the last 32°F night comes after April 19; 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
- Ohio climateThe statewide normals and every place in the state
- Hamilton, OH4 miles from this station, 53.8°F a year
- Cheviot, OH14 miles from this station, 53.8°F a year
- Mack, OH14 miles from this station, 53.6°F a year
- Cincinnati-Fernbank, OH17 miles from this station, 55.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made