Photo: TCP04 · CC BY 4.0Old Monroe’s winters are colder but less snowy than most of the U.S.
A typical July afternoon reaches 89°, a January night drops to 21°, and about 9 inches of snow falls in a normal winter.
A year in Old Monroe at a glance
Each month’s typical high and low, and what it brings.
What stands out about Old Monroe’s climate
Compared with towns across the U.S., with Old Monroe’s place in Missouri beside it.
What a year in Old Monroe feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 203 frost-free days a year
In half of years the last 32° night comes by April 8 and the first by October 29. Day counts come from NOAA’s station at St Peters 2 Se, MO, 14 miles from the town’s center, 120 ft higher; frost dates and degree days from St Charles Elm Pt, MO, 15 miles away.
The 2023 USDA map puts Old Monroe’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 9 inches of snow a winter
Snow, measured at St Charles Elm Pt, MO, falls mostly in January. Precipitation (rain plus melted snow) adds up to 41 inches a year; May is the wettest month and February the driest. Rain or snow falls on about 101 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Old Monroe
78% 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 St Charles Elm Pt, MO.
Living with Old Monroe’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
203 frost-free days in zone 6b. The last frost comes by Apr 8 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 29.
Months with highs of 62–84° and lows of 40° or more: April, May, September and October. 0.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Old Monroe from natural hazards, river flooding is the largest share (64%); heat waves, cold waves, winter storms and ice storms together are 16%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Old Monroe and similar climates
TownRatings has no climate map of the towns around Old Monroe yet.
Climates most like Old Monroe’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 |
|---|---|---|---|---|
| Old Monroe, MO | 21° | 89° | 41" | 9.0" |
| Paola, KS | 21° | 89° | 40" | 8.4" |
| Lake of the Woods, VA | 25° | 88° | 44" | 11" |
| Hamilton, OH | 22° | 87° | 43" | 9.7" |
| Flatwoods, KY | 24° | 87° | 44" | 6.6" |
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 Old Monroe averaged 1.0° warmer than the 1900s. The biggest change is in December (+2.3°).
A smaller shift than in 75% 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 Old Monroe compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Old Monroe’s place among Missouri’s.
Old Monroe weather by month
Highs, lows and precipitation from NOAA’s grid at Old Monroe’s center; snow, wet days and snow on the ground from St Charles Elm Pt, MO. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 39° | 21° | 2.3" | 4.3" | 8 | 25° – 42° |
| February | 45° | 25° | 2.1" | 2.6" | 7 | 24° – 44° |
| March | 56° | 34° | 3.3" | 0.5" | 10 | 37° – 58° |
| April | 67° | 44° | 4.5" | 0.0" | 10 | 48° – 61° |
| May | 76° | 54° | 4.9" | 0.0" | 11 | 60° – 73° |
| June | 85° | 64° | 4.5" | 0.0" | 9 | 69° – 78° |
| July | 89° | 68° | 3.9" | 0.0" | 8 | 73° – 85° |
| August | 87° | 65° | 3.6" | 0.0" | 7 | 70° – 82° |
| September | 80° | 57° | 3.3" | 0.0" | 7 | 64° – 75° |
| October | 69° | 45° | 3.1" | 0.0" | 8 | 52° – 63° |
| November | 55° | 35° | 3.3" | 0.1" | 8 | 37° – 52° |
| December | 44° | 26° | 2.4" | 1.5" | 7 | 21° – 43° |
| Year | 66° | 45° | 41.3" | 9.0" | 101 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 21° to 43°. June is the most reliable, staying within 9°.
Where Old Monroe’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 Old Monroe’s center.
- Snow: St Charles Elm Pt, MO.
- Frost dates, heating and cooling: St Charles Elm Pt, MO, 15 miles away.
- Freezing nights, 90° and 100° days: St Peters 2 Se, MO, 14 miles from the town’s center, 120 ft higher; 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 Old Monroe’s climate
What is the weather like in Old Monroe?
A typical July afternoon reaches 89°, a January night drops to 21°, and about 9 inches of snow falls in a normal winter. Colder January nights than 52% of U.S. towns; hotter July afternoons than 70% of U.S. towns.
How cold does it get in Old Monroe in winter?
January nights average 21°. About 103 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 25°.
How much snow does Old Monroe get?
About 9.0 inches in a normal winter at St Charles Elm Pt, MO, most of it in January.
How hot does it get in Old Monroe?
July, with a typical high of 89° and a low of 68°. About 39 days a year reach 90° and 2 reach 100° (St Charles Elm Pt, MO).
When is the first and last frost in Old Monroe?
In half of years the last spring frost (32°) comes by April 8 and the first fall frost by October 29, about 203 frost-free days, at St Charles Elm Pt, MO.
What growing zone is Old Monroe 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 Old Monroe?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Old Monroe getting warmer?
Yes: 1991–2020 averaged 1.0° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 75% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Old Monroe.
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.