Steffenville, Missouri climate: Climate normals at a NOAA weather station
Steffenville's normal year runs from 18°F January nights to 86°F July afternoons, with 39.5 inches of precipitation and 18 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.4°C, January lows of −8°C, July highs of 30°C, 1,003 mm of precipitation a year.
- NOAA stationSteffenville
- Station IDUSC00238051
- Location39.97°N 91.89°W
- Elevation705 ft (215 m)
On October 23, the normal high in Steffenville is 62°F and the normal low 42°F, and the chance of measurable rain or snow is 24%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Steffenville.
- Jan 35° 18°
- Feb 40° 22°
- Mar 52° 32°
- Apr 64° 42°
- May 73° 53°
- Jun 82° 62°
- Jul 86° 66°
- Aug 84° 64°
- Sep 78° 55°
- Oct 66° 44°
- Nov 51° 33°
- Dec 39° 23°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Steffenville each month?
July is the warmest month, with normal highs of 86°F; January the coldest, with normal lows of 18°F. The most precipitation falls in May (5.06 in), the least in January (1.70 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 35°F | 18°F | 26.1°F | 1.70 | 5.8 | 7 | <1 | 27 | 9 h 40 min |
| February | 40°F | 22°F | 30.5°F | 1.85 | 4.1 | 7 | <1 | 23 | 10 h 40 min |
| March | 52°F | 32°F | 41.8°F | 2.49 | 2.1 | 8 | <1 | 16 | 11 h 50 min |
| April | 64°F | 42°F | 53.0°F | 4.01 | 0.7 | 11 | <1 | 5 | 13 h 10 min |
| May | 73°F | 53°F | 63.0°F | 5.06 | 0.0 | 12 | 1 | <1 | 14 h 20 min |
| June | 82°F | 62°F | 72.1°F | 4.84 | 0.0 | 10 | 5 | <1 | 15 h |
| July | 86°F | 66°F | 75.6°F | 3.98 | 0.0 | 9 | 11 | <1 | 14 h 50 min |
| August | 84°F | 64°F | 73.9°F | 3.88 | 0.0 | 8 | 9 | <1 | 13 h 50 min |
| September | 78°F | 55°F | 66.3°F | 3.73 | 0.0 | 7 | 4 | <1 | 12 h 30 min |
| October | 66°F | 44°F | 54.9°F | 3.41 | 0.1 | 8 | <1 | 3 | 11 h 10 min |
| November | 51°F | 33°F | 41.8°F | 2.61 | 1.0 | 7 | <1 | 14 | 10 h |
| December | 39°F | 23°F | 30.9°F | 1.91 | 4.0 | 7 | <1 | 24 | 9 h 20 min |
| Year (annual) | 62°F | 43°F | 52.5°F | 39.47 | 17.8 | 99 | 30 | 113 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 1°C | −8°C | −3.3°C | 43 mm | 15 cm |
| February | 4°C | −6°C | −0.8°C | 47 mm | 10 cm |
| March | 11°C | 0°C | 5.4°C | 63 mm | 5 cm |
| April | 18°C | 6°C | 11.7°C | 102 mm | 2 cm |
| May | 23°C | 12°C | 17.2°C | 129 mm | 0 cm |
| June | 28°C | 17°C | 22.3°C | 123 mm | 0 cm |
| July | 30°C | 19°C | 24.2°C | 101 mm | 0 cm |
| August | 29°C | 18°C | 23.3°C | 99 mm | 0 cm |
| September | 25°C | 13°C | 19.1°C | 95 mm | 0 cm |
| October | 19°C | 7°C | 12.7°C | 87 mm | 0 cm |
| November | 11°C | 0°C | 5.4°C | 66 mm | 3 cm |
| December | 4°C | −5°C | −0.6°C | 49 mm | 10 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00238051; 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.
Which months are mildest at Steffenville?
Normal highs sit between 65°F and 85°F in May, June, August, 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 USC00238051.
When is the last frost at Steffenville?
In Steffenville, the last spring frost (32°F) comes after April 17 in half of years and after May 4 in one year in ten; the first autumn frost comes before October 19 in half of years and before September 30 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 171 year in 10 after May 4; 9 in 10 after April 3
- First autumn frost, half of years before
- October 191 year in 10 before September 30; 9 in 10 before October 31
NOAA puts the median frost-free season at 184 days, and the season without a hard freeze (28°F) at 205 days.
A hard freeze (28°F) comes after April 7 in half of springs and before October 30 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Steffenville in zone 6a in ZIP code 63434, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 6a: the coldest night of a typical year reaches −8°F (28 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 USC00238051; 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 at Steffenville?
In a normal year in Steffenville, 30 days a year reach 90°F (1 of them 100°F or more), 113 nights fall to 32°F or colder and 99 days bring measurable precipitation.
- Days at 90°F or more
- 30a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 113a normal year
- Days that stay below freezing
- 30high of 32°F or less
- Days with 0.01 inch of precipitation
- 99a normal year
- Days with 1 inch of snow or more
- 7a normal year
The highest temperature in this station's record (since 1897) is 115°F, on July 15, 1936; the lowest is −28°F, on February 13, 1905.
The wettest calendar year on that record is 2008, with 57.26 in; the snowiest season is 1964–65, with 46.3 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00238051; records: ACIS (NOAA Regional Climate Centers), station USC00238051. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Steffenville?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds at Steffenville, 4.2 kWh per square metre a day. July is the sunniest month (82%) and December the cloudiest (65%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 66% | 2.0 |
| February | 68% | 2.9 |
| March | 68% | 3.8 |
| April | 71% | 5.0 |
| May | 73% | 5.7 |
| June | 79% | 6.4 |
| July | 82% | 6.4 |
| August | 81% | 5.6 |
| September | 82% | 4.8 |
| October | 75% | 3.3 |
| November | 72% | 2.3 |
| December | 65% | 1.8 |
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 many heating and cooling degree days does Steffenville record?
A normal year at Steffenville brings 5,592 heating degree days, 4% more than the median U.S. place (5,373), and 1,070 cooling degree days, 18% 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 3,593 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,204 | 0 |
| February | 966 | 0 |
| March | 721 | 2 |
| April | 372 | 14 |
| May | 137 | 75 |
| June | 14 | 225 |
| July | 2 | 330 |
| August | 5 | 281 |
| September | 81 | 121 |
| October | 336 | 21 |
| November | 698 | 1 |
| December | 1,056 | 0 |
| Year (annual) | 5,592 | 1,070 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00238051. 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.
Have recent years at Steffenville been warmer than normal?
2025 averaged 53.8°F, 1.3°F above the 1991-2020 normal of 52.5°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 53.8°F | +1.3°F | 49.81 | 15.5 |
| 2022 | 52.1°F | −0.4°F | 34.29 | 29.0 |
| 2023 | 55.1°F | +2.6°F | 22.79 | 8.1 |
| 2024 | 55.3°F | +2.8°F | 32.69 | 12.7 |
| 2025 | 53.8°F | +1.3°F | 30.22 | 26.8 |
Over 111 complete years from 1898 to 2025, the station's annual mean temperature rose at a fitted 1.3°F per century (+0.07°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00238051; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Steffenville's climate compare?
Steffenville is warmer than 18 of the 134 places with their own NOAA record in Missouri, and wetter than 18. Across the 7,247 U.S. stations with normals, its annual mean of 52.5°F is warmer than 52%.
In the Köppen classification computed from these normals, Steffenville 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 Steffenville share this climate record?
9 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.
- La Belle, MO645 people · 10 mi N
- Lewistown, MO508 people · 9 mi NE
- Ewing, MO394 people · 10 mi E
- Philadelphia, MO250 people · 12 mi SE
- Knox City, MO188 people · 14 mi NW
- Bethel, MO128 people · 10 mi SW
- Novelty, MO113 people · 17 mi W
- Newark, MO59 people · 5 mi W
- Plevna, MO0 people · 10 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 Steffenville's climate
What is the coldest month at Steffenville?
January, with a normal high of 35°F and a normal low of 18°F. The warmest is July (86°F by day, 66°F at night).
Does it snow at Steffenville?
Yes: 18 inches in a normal year, falling on 12 days with 0.1 inch or more, the most in January (5.8 inches).
What is the rainiest month at Steffenville?
May, with 5.06 in of precipitation in a normal year; the driest is January with 1.70 in.
What plant hardiness zone is Steffenville in?
The USDA's 2023 map puts Steffenville in zone 6a in ZIP code 63434, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −8°F (28 years, 1991-2020): zone 6a.
How late can frost come at Steffenville?
In half of years the last 32°F night comes after April 17; in one year in ten it comes after May 4. Waiting until May 4 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Missouri climateThe statewide normals and every place in the state
- Shelbina, MO22 miles from this station, 52.6°F a year
- Canton, MO23 miles from this station, 52.0°F a year
- Monroe City, MO25 miles from this station, 52.9°F a year
- Hannibal, MO32 miles from this station, 53.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made