Farmington, Missouri climate: Normal weather by month, frost dates and records
Farmington's normal year runs from 23°F January nights to 89°F July afternoons, with 45.2 inches of precipitation and 9 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 13.4°C, January lows of −5°C, July highs of 31°C, 1,147 mm of precipitation a year.
- NOAA stationFarmington
- Station IDUSC00232809
- Location37.79°N 90.41°W
- Elevation900 ft (274 m)
- Population19,165
On October 23, the normal high in Farmington is 67°F and the normal low 42°F, and the chance of measurable rain or snow is 29%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Farmington.
- Jan 43° 23°
- Feb 48° 26°
- Mar 58° 34°
- Apr 69° 44°
- May 77° 54°
- Jun 85° 63°
- Jul 89° 67°
- Aug 88° 65°
- Sep 81° 56°
- Oct 70° 45°
- Nov 57° 34°
- Dec 46° 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 Farmington each month?
July is the warmest month, with normal highs of 89°F; January the coldest, with normal lows of 23°F. The most precipitation falls in May (5.49 in), the least in January (2.58 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 43°F | 23°F | 32.7°F | 2.58 | 2.7 | 8 | <1 | 26 | 9 h 50 min |
| February | 48°F | 26°F | 36.8°F | 2.78 | 2.1 | 8 | <1 | 21 | 10 h 50 min |
| March | 58°F | 34°F | 46.0°F | 3.81 | 1.0 | 10 | <1 | 14 | 11 h 50 min |
| April | 69°F | 44°F | 56.5°F | 5.26 | 0.0 | 11 | <1 | 4 | 13 h 10 min |
| May | 77°F | 54°F | 65.5°F | 5.49 | 0.0 | 13 | 1 | <1 | 14 h 10 min |
| June | 85°F | 63°F | 73.7°F | 3.55 | 0.0 | 10 | 5 | <1 | 14 h 50 min |
| July | 89°F | 67°F | 77.7°F | 4.28 | 0.0 | 9 | 12 | <1 | 14 h 30 min |
| August | 88°F | 65°F | 76.3°F | 3.82 | 0.0 | 9 | 10 | <1 | 13 h 40 min |
| September | 81°F | 56°F | 68.5°F | 3.18 | 0.0 | 8 | 3 | <1 | 12 h 30 min |
| October | 70°F | 45°F | 57.4°F | 3.27 | 0.0 | 8 | <1 | 3 | 11 h 20 min |
| November | 57°F | 34°F | 45.6°F | 4.18 | 0.1 | 9 | <1 | 14 | 10 h 10 min |
| December | 46°F | 26°F | 36.4°F | 2.96 | 2.8 | 9 | <1 | 23 | 9 h 30 min |
| Year (annual) | 67°F | 45°F | 56.1°F | 45.16 | 8.7 | 111 | 32 | 104 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 6°C | −5°C | 0.4°C | 66 mm | 7 cm |
| February | 9°C | −3°C | 2.7°C | 71 mm | 5 cm |
| March | 14°C | 1°C | 7.8°C | 97 mm | 3 cm |
| April | 20°C | 7°C | 13.6°C | 134 mm | 0 cm |
| May | 25°C | 12°C | 18.6°C | 139 mm | 0 cm |
| June | 29°C | 17°C | 23.2°C | 90 mm | 0 cm |
| July | 31°C | 19°C | 25.4°C | 109 mm | 0 cm |
| August | 31°C | 18°C | 24.6°C | 97 mm | 0 cm |
| September | 27°C | 13°C | 20.3°C | 81 mm | 0 cm |
| October | 21°C | 7°C | 14.1°C | 83 mm | 0 cm |
| November | 14°C | 1°C | 7.6°C | 106 mm | 0 cm |
| December | 8°C | −3°C | 2.4°C | 75 mm | 7 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00232809; 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 Farmington?
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 (8).
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 USC00232809.
When is the last frost in Farmington?
In Farmington, the last spring frost (32°F) comes after April 13 in half of years and after April 30 in one year in ten; the first autumn frost comes before October 21 in half of years and before October 6 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 131 year in 10 after April 30; 9 in 10 after March 28
- First autumn frost, half of years before
- October 211 year in 10 before October 6; 9 in 10 before November 1
NOAA puts the median frost-free season at 191 days, and the season without a hard freeze (28°F) at 213 days.
A hard freeze (28°F) comes after April 1 in half of springs and before November 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Farmington in zone 6b in ZIP code 63640, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Farmington's NOAA station is in zone 6b: the coldest night of a typical year reaches −1°F (24 complete years).
Frost dates for every NOAA station in Missouri · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00232809; 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 Farmington?
In a normal year in Farmington, 32 days a year reach 90°F (2 of them 100°F or more), 104 nights fall to 32°F or colder and 111 days bring measurable precipitation.
- Days at 90°F or more
- 32a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 104a normal year
- Days that stay below freezing
- 17high of 32°F or less
- Days with 0.01 inch of precipitation
- 111a normal year
- Days with 1 inch of snow or more
- 3a normal year
The highest temperature in this station's record (since 1906) is 114°F, on August 9, 1934; the lowest is −23°F, on January 11, 1977.
The wettest calendar year on that record is 1957, with 62.92 in; the snowiest season is 1923–24, with 34.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00232809; records: ACIS (NOAA Regional Climate Centers), station USC00232809. Records use complete months only; a month missing more than three days is left out.
How sunny is Farmington?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Farmington, 4.3 kWh per square metre a day. June is the sunniest month (82%) and December the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 68% | 2.2 |
| February | 66% | 2.9 |
| March | 68% | 3.9 |
| April | 72% | 5.1 |
| May | 74% | 5.7 |
| June | 82% | 6.5 |
| July | 82% | 6.3 |
| August | 81% | 5.6 |
| September | 81% | 4.8 |
| October | 76% | 3.5 |
| November | 73% | 2.5 |
| December | 66% | 1.9 |
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 Farmington need?
A normal year in Farmington brings 4,551 heating degree days, 15% fewer than the median U.S. place (5,373), and 1,341 cooling degree days, 48% more than 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 4,114 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,001 | 0 |
| February | 788 | 0 |
| March | 592 | 5 |
| April | 281 | 26 |
| May | 92 | 109 |
| June | 8 | 270 |
| July | 0 | 394 |
| August | 2 | 352 |
| September | 50 | 153 |
| October | 265 | 29 |
| November | 586 | 2 |
| December | 887 | 0 |
| Year (annual) | 4,551 | 1,341 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00232809. 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 Farmington been warmer than normal lately?
Over 94 complete years from 1889 to 2018, the station's annual mean temperature rose at a fitted -0.7°F per century (−0.04°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Farmington's climate compare?
Farmington is warmer than 92 of the other 133 places with their own NOAA record in Missouri, and wetter than 77. Across the 7,247 U.S. stations with normals, its annual mean of 56.1°F is warmer than 64%.
In the Köppen classification computed from these normals, Farmington 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 Farmington share this climate record?
12 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.
- Park Hills, MO8,705 people · 5 mi W
- Bonne Terre, MO6,487 people · 11 mi NW
- Desloge, MO4,836 people · 8 mi NW
- Bismarck, MO1,222 people · 12 mi W
- Leadwood, MO1,155 people · 11 mi NW
- Doe Run, MO895 people · 6 mi SW
- Lake Timberline, MO773 people · 16 mi NW
- Leadington, MO763 people · 5 mi NW
- Pilot Knob, MO683 people · 17 mi SW
- Iron Mountain Lake, MO640 people · 14 mi SW
- Wortham, MO163 people · 11 mi W
- Frankclay, MO77 people · 12 mi NW
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 Farmington's climate
What is the coldest month in Farmington?
January, with a normal high of 43°F and a normal low of 23°F. The warmest is July (89°F by day, 67°F at night).
Does it snow in Farmington?
Yes: 9 inches in a normal year, falling on 5 days with 0.1 inch or more, the most in December (2.8 inches).
What is the rainiest month in Farmington?
May, with 5.49 in of precipitation in a normal year; the driest is January with 2.58 in.
What plant hardiness zone is Farmington in?
The USDA's 2023 map puts Farmington in zone 6b in ZIP code 63640, the nearest ZIP area. By the same method at Farmington's NOAA station, the coldest night of a typical year reaches −1°F (24 years, 1991-2020): zone 6b.
How late can frost come in Farmington?
In half of years the last 32°F night comes after April 13; in one year in ten it comes after April 30. Waiting until April 30 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Missouri climateThe statewide normals and every place in the state
- Fredericktown, MO16 miles from this station, 54.5°F a year
- Potosi, MO25 miles from this station, 54.7°F a year
- Perryville, MO27 miles from this station, 55.0°F a year
- Kaskaskia, IL29 miles from this station, 56.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made