Smithville, Missouri climate: Normal weather by month, frost dates and records
Smithville's normal year runs from 16°F January nights to 87°F July afternoons, with 40.0 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.7°C, January lows of −9°C, July highs of 30°C, 1,017 mm of precipitation a year.
- NOAA stationSmithville Lake
- Station IDUSC00237862
- Location39.39°N 94.55°W
- Elevation904 ft (276 m)
- From the center1 miles
- Population10,971
On October 14, the normal high in Smithville is 67°F and the normal low 44°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Smithville.
- Jan 36° 16°
- Feb 42° 21°
- Mar 53° 31°
- Apr 64° 41°
- May 73° 53°
- Jun 82° 63°
- Jul 87° 68°
- Aug 85° 66°
- Sep 78° 56°
- Oct 66° 44°
- Nov 53° 31°
- Dec 42° 22°
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 Smithville each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 16°F. The most precipitation falls in May (5.38 in), the least in January (1.15 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 36°F | 16°F | 26.3°F | 1.15 | – | <1 | 29 | 9 h 40 min |
| February | 42°F | 21°F | 31.2°F | 1.40 | – | <1 | 24 | 10 h 40 min |
| March | 53°F | 31°F | 42.0°F | 2.29 | – | <1 | 16 | 11 h 50 min |
| April | 64°F | 41°F | 52.4°F | 3.85 | – | <1 | 5 | 13 h 10 min |
| May | 73°F | 53°F | 62.9°F | 5.38 | – | 1 | <1 | 14 h 20 min |
| June | 82°F | 63°F | 72.7°F | 5.27 | – | 5 | <1 | 15 h |
| July | 87°F | 68°F | 77.1°F | 4.87 | – | 11 | <1 | 14 h 40 min |
| August | 85°F | 66°F | 75.5°F | 4.36 | – | 10 | <1 | 13 h 50 min |
| September | 78°F | 56°F | 67.0°F | 4.30 | – | 3 | <1 | 12 h 30 min |
| October | 66°F | 44°F | 54.8°F | 3.47 | – | <1 | 4 | 11 h 10 min |
| November | 53°F | 31°F | 42.3°F | 2.10 | – | <1 | 15 | 10 h |
| December | 42°F | 22°F | 31.8°F | 1.59 | – | <1 | 26 | 9 h 20 min |
| Year (annual) | 63°F | 43°F | 53.0°F | 40.03 | – | 30 | 119 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 2°C | −9°C | −3.2°C | 29 mm |
| February | 5°C | −6°C | −0.4°C | 36 mm |
| March | 11°C | 0°C | 5.6°C | 58 mm |
| April | 18°C | 5°C | 11.3°C | 98 mm |
| May | 23°C | 12°C | 17.2°C | 137 mm |
| June | 28°C | 17°C | 22.6°C | 134 mm |
| July | 30°C | 20°C | 25.1°C | 124 mm |
| August | 30°C | 19°C | 24.2°C | 111 mm |
| September | 25°C | 13°C | 19.4°C | 109 mm |
| October | 19°C | 6°C | 12.7°C | 88 mm |
| November | 12°C | 0°C | 5.7°C | 53 mm |
| December | 5°C | −5°C | −0.1°C | 40 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Kansas City (12 miles away), gets 18 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00237862; 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 Smithville?
Normal highs sit between 65°F and 85°F in May, June, September and October.
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 USC00237862.
When is the last frost in Smithville?
In Smithville, the last spring frost (32°F) comes after April 18 in half of years and after May 3 in one year in ten; the first autumn frost comes before October 20 in half of years and before October 5 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 181 year in 10 after May 3; 9 in 10 after April 4
- First autumn frost, half of years before
- October 201 year in 10 before October 5; 9 in 10 before November 1
NOAA puts the median frost-free season at 183 days, and the season without a hard freeze (28°F) at 204 days.
A hard freeze (28°F) comes after April 7 in half of springs and before October 29 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Smithville in zone 6a in ZIP code 64089.
Frost dates for every NOAA station in Missouri · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00237862; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Smithville?
In a normal year in Smithville, 30 days a year reach 90°F (2 of them 100°F or more) and 119 nights fall to 32°F or colder.
- Days at 90°F or more
- 30a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 119a normal year
- Days that stay below freezing
- 28high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00237862.
How sunny is Smithville?
Over a year 76% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Smithville, 4.2 kWh per square metre a day. July is the sunniest month (83%) and March the cloudiest (69%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 69% | 2.1 |
| February | 71% | 3.0 |
| March | 69% | 3.9 |
| April | 71% | 5.0 |
| May | 73% | 5.7 |
| June | 80% | 6.5 |
| July | 83% | 6.5 |
| August | 82% | 5.7 |
| September | 82% | 4.8 |
| October | 75% | 3.4 |
| November | 74% | 2.4 |
| December | 70% | 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 Smithville need?
A normal year in Smithville brings 5,532 heating degree days, 3% more than the median U.S. place (5,373), and 1,194 cooling degree days, 32% 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 3,705 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,200 | 0 |
| February | 947 | 0 |
| March | 717 | 3 |
| April | 389 | 11 |
| May | 143 | 78 |
| June | 13 | 244 |
| July | 1 | 375 |
| August | 4 | 329 |
| September | 74 | 134 |
| October | 336 | 20 |
| November | 682 | 1 |
| December | 1,028 | 0 |
| Year (annual) | 5,532 | 1,194 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00237862. 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.
How does Smithville's climate compare?
Smithville is warmer than 24 of the other 133 places with their own NOAA record in Missouri, and wetter than 23. Across the 7,247 U.S. stations with normals, its annual mean of 53.0°F is warmer than 54%.
In the Köppen classification computed from these normals, Smithville 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 Smithville 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.
- Plattsburg, MO2,256 people · 12 mi N
- Gower, MO1,531 people · 16 mi N
- Trimble, MO654 people · 6 mi N
- Edgerton, MO609 people · 9 mi NW
- Ridgely, MO102 people · 7 mi NW
- Grayson, MO0 people · 10 mi N
- Paradise, MO0 people · 3 mi NE
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 Smithville's climate
What is the coldest month in Smithville?
January, with a normal high of 36°F and a normal low of 16°F. The warmest is July (87°F by day, 68°F at night).
Does it snow in Smithville?
Yes. NOAA publishes no 1991-2020 snowfall normal for Smithville's NOAA station; the nearest record that keeps one, Kansas City (12 miles away), records 18 inches of snow in a normal year.
What is the rainiest month in Smithville?
May, with 5.38 in of precipitation in a normal year; the driest is January with 1.15 in.
What plant hardiness zone is Smithville in?
The USDA's 2023 map puts Smithville in zone 6a in ZIP code 64089.
How late can frost come in Smithville?
In half of years the last 32°F night comes after April 18; in one year in ten it comes after May 3. Waiting until May 3 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Missouri climateThe statewide normals and every place in the state
- Kansas City, MO12 miles from this station, 54.7°F a year
- Kearney, MO12 miles from this station, 53.7°F a year
- Kansas City Downtown Airport, MO19 miles from this station, 56.9°F a year
- Leavenworth, KS21 miles from this station, 55.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made