Vandalia, Missouri climate: Normal weather by month, frost dates and records
Vandalia's normal year runs from 19°F January nights to 86°F July afternoons, with 41.3 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.7°C, January lows of −7°C, July highs of 30°C, 1,048 mm of precipitation a year.
- NOAA stationVandalia
- Station IDUSC00238577
- Location39.31°N 91.49°W
- Elevation764 ft (233 m)
- From the centerunder 1 mile
- Population2,939
On October 23, the normal high in Vandalia is 64°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 Vandalia.
- Jan 36° 19°
- Feb 41° 22°
- Mar 52° 31°
- Apr 64° 42°
- May 74° 53°
- Jun 83° 63°
- Jul 86° 66°
- Aug 85° 64°
- Sep 79° 56°
- Oct 67° 44°
- Nov 53° 33°
- Dec 41° 24°
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 Vandalia each month?
July is the warmest month, with normal highs of 86°F; January the coldest, with normal lows of 19°F. The most precipitation falls in June (5.07 in), the least in December (2.04 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 36°F | 19°F | 27.1°F | 2.20 | 6 | <1 | 28 | 9 h 40 min |
| February | 41°F | 22°F | 31.5°F | 2.27 | 7 | <1 | 24 | 10 h 40 min |
| March | 52°F | 31°F | 41.8°F | 3.35 | 9 | <1 | 18 | 11 h 50 min |
| April | 64°F | 42°F | 53.1°F | 4.23 | 10 | <1 | 5 | 13 h 10 min |
| May | 74°F | 53°F | 63.4°F | 4.97 | 12 | <1 | <1 | 14 h 20 min |
| June | 83°F | 63°F | 72.5°F | 5.07 | 10 | 5 | <1 | 15 h |
| July | 86°F | 66°F | 76.4°F | 4.59 | 8 | 10 | <1 | 14 h 40 min |
| August | 85°F | 64°F | 74.7°F | 3.37 | 7 | 9 | <1 | 13 h 50 min |
| September | 79°F | 56°F | 67.2°F | 3.69 | 8 | 3 | <1 | 12 h 30 min |
| October | 67°F | 44°F | 55.2°F | 2.76 | 9 | <1 | 3 | 11 h 10 min |
| November | 53°F | 33°F | 42.6°F | 2.73 | 7 | <1 | 16 | 10 h |
| December | 41°F | 24°F | 32.1°F | 2.04 | 7 | <1 | 26 | 9 h 30 min |
| Year (annual) | 63°F | 43°F | 53.1°F | 41.27 | 99 | 27 | 119 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 2°C | −7°C | −2.7°C | 56 mm |
| February | 5°C | −5°C | −0.3°C | 58 mm |
| March | 11°C | 0°C | 5.4°C | 85 mm |
| April | 18°C | 6°C | 11.7°C | 107 mm |
| May | 23°C | 12°C | 17.4°C | 126 mm |
| June | 28°C | 17°C | 22.5°C | 129 mm |
| July | 30°C | 19°C | 24.7°C | 117 mm |
| August | 30°C | 18°C | 23.7°C | 86 mm |
| September | 26°C | 13°C | 19.6°C | 94 mm |
| October | 19°C | 7°C | 12.9°C | 70 mm |
| November | 11°C | 0°C | 5.9°C | 69 mm |
| December | 5°C | −5°C | 0.1°C | 52 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Bowling Green (17 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 USC00238577; 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 Vandalia?
Normal highs sit between 65°F and 85°F in 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 USC00238577.
When is the last frost in Vandalia?
In Vandalia, the last spring frost (32°F) comes after April 11 in half of years and after April 25 in one year in ten; the first autumn frost comes before October 23 in half of years and before October 7 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 111 year in 10 after April 25; 9 in 10 after March 31
- First autumn frost, half of years before
- October 231 year in 10 before October 7; 9 in 10 before November 3
NOAA puts the median frost-free season at 192 days, and the season without a hard freeze (28°F) at 212 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 Vandalia in zone 6b in ZIP code 63382, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Vandalia's NOAA station is in zone 6a: the coldest night of a typical year reaches −5°F (15 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 Missouri · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00238577; 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 Vandalia?
In a normal year in Vandalia, 27 days a year reach 90°F (1 of them 100°F or more), 119 nights fall to 32°F or colder and 99 days bring measurable precipitation.
- Days at 90°F or more
- 27a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 119a normal year
- Days that stay below freezing
- 32high of 32°F or less
- Days with 0.01 inch of precipitation
- 99a normal year
The highest temperature in this station's record (since 1911) is 108°F, on July 30, 1980; the lowest is −24°F, on January 7, 1912.
The wettest calendar year on that record is 2008, with 59.11 in; the snowiest season is 1977–78, with 60.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00238577; records: ACIS (NOAA Regional Climate Centers), station USC00238577. Records use complete months only; a month missing more than three days is left out.
How sunny is Vandalia?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Vandalia, 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 much heating and cooling does Vandalia need?
A normal year in Vandalia brings 5,440 heating degree days, 1% more than the median U.S. place (5,373), and 1,151 cooling degree days, 27% 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 3,693 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,175 | 0 |
| February | 939 | 0 |
| March | 721 | 2 |
| April | 370 | 13 |
| May | 132 | 82 |
| June | 13 | 240 |
| July | 1 | 355 |
| August | 3 | 303 |
| September | 67 | 133 |
| October | 325 | 22 |
| November | 675 | 1 |
| December | 1,020 | 0 |
| Year (annual) | 5,440 | 1,151 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00238577. 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 Vandalia been warmer than normal lately?
2022 averaged 52.4°F, 0.7°F below the 1991-2020 normal of 53.1°F. 1 of the 2 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 54.1°F | +1.0°F | 45.65 |
| 2022 | 52.4°F | −0.7°F | 35.48 |
Over 49 complete years from 1950 to 2025, the station's annual mean temperature rose at a fitted 3.6°F per century (+0.20°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00238577; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Vandalia's climate compare?
Vandalia is warmer than 27 of the other 133 places with their own NOAA record in Missouri, and wetter than 35. Across the 7,247 U.S. stations with normals, its annual mean of 53.1°F is warmer than 54%.
In the Köppen classification computed from these normals, Vandalia 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 Vandalia 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.
- Wellsville, MO1,006 people · 17 mi S
- Perry, MO684 people · 13 mi NW
- Laddonia, MO507 people · 9 mi SW
- Farber, MO253 people · 5 mi SW
- Curryville, MO204 people · 9 mi E
- Middletown, MO170 people · 13 mi S
- Buell, MO24 people · 19 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 Vandalia's climate
What is the coldest month in Vandalia?
January, with a normal high of 36°F and a normal low of 19°F. The warmest is July (86°F by day, 66°F at night).
Does it snow in Vandalia?
Yes. NOAA publishes no 1991-2020 snowfall normal for Vandalia's NOAA station; the nearest record that keeps one, Bowling Green (17 miles away), records 16 inches of snow in a normal year.
What is the rainiest month in Vandalia?
June, with 5.07 in of precipitation in a normal year; the driest is December with 2.04 in.
What plant hardiness zone is Vandalia in?
The USDA's 2023 map puts Vandalia in zone 6b in ZIP code 63382, the nearest ZIP area. By the same method at Vandalia's NOAA station, the coldest night of a typical year reaches −5°F (15 years, 1991-2020): zone 6a.
How late can frost come in Vandalia?
In half of years the last 32°F night comes after April 11; in one year in ten it comes after April 25. Waiting until April 25 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Missouri climateThe statewide normals and every place in the state
- Bowling Green, MO17 miles from this station, 53.3°F a year
- Mexico, MO23 miles from this station, 54.2°F a year
- Monroe City, MO25 miles from this station, 52.9°F a year
- Saverton, MO26 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