A middle-of-the-road climate: Smithton is close to most U.S. towns on every count
On a normal January night the air cools to about 21°. Expect the heaviest rain or snow in May and the lightest in January. In July, afternoons here are warmer than in 67% of U.S. towns. Homes need heating from November to March, the months averaging under 50°.
A year in Smithton at a glance
Each month’s typical high and low, and what it brings.
What stands out about Smithton’s climate
Compared with towns across the U.S., with Smithton’s place in Missouri beside it.
What a year in Smithton feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 197 frost-free days a year
In half of years the last 32° night comes by April 10 and the first by October 26. Frost and day counts come from NOAA’s station at Sedalia Mem Airport, 5 miles from the town’s center, at about the same height.
The 2023 USDA map puts Smithton’s center in zone 6b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −2°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 13 inches of snow a winter
Snow, measured at Sedalia Wtp, MO, falls mostly in January. Precipitation (rain plus melted snow) adds up to 42 inches a year; May is the wettest month and January the driest. Rain or snow falls on about 97 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Smithton
80% of the work is heating. Months averaging under 55° run from November through March.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Sedalia Mem Airport.
Living with Smithton’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
197 frost-free days in zone 6b. The last frost comes by Apr 10 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 26.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October.
Parks & trails →Of the yearly building losses FEMA expects in Smithton from natural hazards, river flooding is the largest share (43%); heat waves, cold waves, winter storms and ice storms together are 29%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Smithton and similar climates
TownRatings has no climate map of the towns around Smithton yet.
Climates most like Smithton’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Smithton, MO | 21° | 88° | 42" | 13" |
| Jerseyville, IL | 21° | 87° | 41" | 13" |
| Terre Haute, IN | 21° | 87° | 43" | 15" |
| Hamilton, OH | 22° | 87° | 43" | 9.7" |
| Lake of the Woods, VA | 25° | 88° | 44" | 11" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Smithton averaged 0.9° warmer than the 1900s. The biggest change is in February (+2.0°).
A smaller shift than in 85% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Smithton compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Smithton’s place among Missouri’s.
Smithton weather by month
Highs, lows and precipitation from NOAA’s grid at Smithton’s center; snow, wet days and snow on the ground from Sedalia Wtp, MO. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 40° | 21° | 1.7" | 4.9" | 7 | 5 | 24° – 41° |
| February | 45° | 25° | 2.0" | 2.7" | 6 | 3 | 25° – 45° |
| March | 56° | 34° | 2.8" | 1.7" | 9 | 1 | 38° – 59° |
| April | 67° | 44° | 4.8" | 0.1" | 11 | 0 | 48° – 61° |
| May | 76° | 54° | 5.3" | 0.0" | 11 | 0 | 59° – 73° |
| June | 84° | 64° | 4.8" | 0.0" | 9 | 0 | 70° – 78° |
| July | 88° | 67° | 4.3" | 0.0" | 8 | 0 | 73° – 85° |
| August | 87° | 65° | 3.7" | 0.0" | 7 | 0 | 70° – 81° |
| September | 80° | 57° | 4.0" | 0.0" | 7 | 0 | 63° – 74° |
| October | 68° | 45° | 3.5" | 0.1" | 9 | 0 | 51° – 62° |
| November | 55° | 35° | 2.8" | 0.4" | 7 | 0 | 37° – 52° |
| December | 44° | 25° | 2.1" | 3.2" | 7 | 2 | 20° – 42° |
| Year | 66° | 45° | 41.6" | 13.1" | 97 | 11 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 20° to 42°. June is the most reliable, staying within 8°.
Where Smithton’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Smithton’s center.
- Snow: Sedalia Wtp, MO.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Sedalia Mem Airport, 5 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Smithton’s climate
What is the weather like in Smithton?
A typical July afternoon reaches 88°, a January night drops to 21°, and about 13 inches of snow falls in a normal winter. Colder January nights than 54% of U.S. towns; hotter July afternoons than 67% of U.S. towns.
How cold does it get in Smithton in winter?
January nights average 21°. About 94 nights a year reach 32° or below and 2 reach 0° or below. In the coldest January of the last 30 years the month averaged 24°.
How much snow does Smithton get?
About 13 inches in a normal winter at Sedalia Wtp, MO, most of it in January, with snow on the ground about 11 days a year.
How hot does it get in Smithton?
July, with a typical high of 88° and a low of 67°. About 38 days a year reach 90° and 3 reach 100° (Sedalia Mem Airport).
When is the first and last frost in Smithton?
In half of years the last spring frost (32°) comes by April 10 and the first fall frost by October 26, about 197 frost-free days, at Sedalia Mem Airport.
What growing zone is Smithton in?
Zone 6b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −2°.
What is the best time of year to visit Smithton?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Smithton getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 85% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Smithton.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.