For weather, Osborn is about as ordinary as U.S. towns get
July afternoons average 87°. May is the wettest month, January the driest. In January, nights here are colder than in 71% of U.S. towns. From April to June and September to October, highs of 64–83° make it easy to spend the day outdoors.
A year in Osborn at a glance
Each month’s typical high and low, and what it brings.
What stands out about Osborn’s climate
Compared with towns across the U.S., with Osborn’s place in Missouri beside it.
What a year in Osborn feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 192 frost-free days a year
In half of years the last 32° night comes by April 15 and the first by October 24. Frost and day counts come from NOAA’s station at Cameron, MO, 6 miles from the town’s center, at about the same height.
The 2023 USDA map puts Osborn’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −9°. 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 21 inches of snow a winter
Snow, measured at Amity 4 Ne, MO, falls mostly in January, February and December. Precipitation (rain plus melted snow) adds up to 40 inches a year; May is the wettest month and January the driest. Rain or snow falls on about 92 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Osborn
83% of the work is heating. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Cameron, MO.
Living with Osborn’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
192 frost-free days in zone 6a. The last frost comes by Apr 15 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 24.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October. 0.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Osborn from natural hazards, river flooding is the largest share (38%); heat waves, cold waves, winter storms and ice storms together are 15%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Osborn and its neighbors
Every town next door is within a degree of Osborn in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Osborn’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 |
|---|---|---|---|---|
| Osborn, MO | 18° | 87° | 40" | 21" |
| Quincy, IL | 19° | 87° | 39" | 17" |
| Keokuk, IA | 18° | 86° | 40" | 23" |
| Lock Haven, PA | 19° | 86° | 41" | 30" |
| Terre Haute, IN | 21° | 87° | 43" | 15" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Osborn averaged 1.0° warmer than the 1900s. The biggest change is in December (+2.4°).
A smaller shift than in 80% 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 Osborn compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Osborn’s place among Missouri’s.
Osborn weather by month
Highs, lows and precipitation from NOAA’s grid at Osborn’s center; snow, wet days and snow on the ground from Amity 4 Ne, MO. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 36° | 18° | 1.1" | 5.3" | 5 | 20° – 38° |
| February | 42° | 22° | 1.5" | 5.6" | 5 | 22° – 42° |
| March | 53° | 32° | 2.5" | 2.0" | 8 | 35° – 57° |
| April | 64° | 42° | 4.0" | 0.5" | 10 | 45° – 59° |
| May | 74° | 52° | 5.4" | 0.0" | 11 | 58° – 72° |
| June | 83° | 62° | 5.1" | 0.0" | 10 | 69° – 77° |
| July | 87° | 66° | 4.7" | 0.0" | 9 | 72° – 84° |
| August | 86° | 64° | 4.3" | 0.0" | 8 | 69° – 80° |
| September | 78° | 55° | 3.9" | 0.0" | 7 | 60° – 73° |
| October | 66° | 43° | 3.2" | 0.3" | 8 | 49° – 59° |
| November | 52° | 32° | 2.1" | 1.5" | 6 | 34° – 51° |
| December | 40° | 22° | 1.7" | 5.5" | 5 | 17° – 39° |
| Year | 63° | 43° | 39.5" | 20.7" | 92 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 35° to 57°. June is the most reliable, staying within 8°.
Where Osborn’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 Osborn’s center.
- Snow: Amity 4 Ne, MO.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Cameron, MO, 6 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 Osborn’s climate
What is the weather like in Osborn?
A typical July afternoon reaches 87°, a January night drops to 18°, and about 21 inches of snow falls in a normal winter. Colder January nights than 71% of U.S. towns; hotter July afternoons than 63% of U.S. towns.
How cold does it get in Osborn in winter?
January nights average 18°. About 132 nights a year reach 32° or below and 6 reach 0° or below. In the coldest January of the last 30 years the month averaged 20°.
How much snow does Osborn get?
About 21 inches in a normal winter at Amity 4 Ne, MO, most of it in January, February and December.
How hot does it get in Osborn?
July, with a typical high of 87° and a low of 66°. About 35 days a year reach 90° (Cameron, MO).
When is the first and last frost in Osborn?
In half of years the last spring frost (32°) comes by April 15 and the first fall frost by October 24, about 192 frost-free days, at Cameron, MO.
What growing zone is Osborn in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −9°.
What is the best time of year to visit Osborn?
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 Osborn getting warmer?
Yes: 1991–2020 averaged 1.0° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 80% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Osborn.
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.