Photo: Markkaempfer · CC BY-SA 4.0Summers, winters and rain in Altenburg all run close to those of most U.S. towns
Peak summer warmth arrives in July, with afternoons near 89°. Seasons differ by 64°, from the coldest nights to the warmest afternoons. By July afternoons alone, it runs hotter than 71% of U.S. towns. Seedlings are safe outdoors from about April 7, with the first autumn frost due around October 29.
A year in Altenburg at a glance
Each month’s typical high and low, and what it brings.
What stands out about Altenburg’s climate
Compared with towns across the U.S., with Altenburg’s place in Missouri beside it.
What a year in Altenburg feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 202 frost-free days a year
In half of years the last 32° night comes by April 7 and the first by October 29. Frost and day counts come from NOAA’s station at Jackson, MO, 18 miles from the town’s center, at about the same height.
The 2023 USDA map puts Altenburg’s center in zone 7a: 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 6 inches of snow a winter
Snow, measured at Grand 2 N, IL, falls mostly in January, February and December. Precipitation (rain plus melted snow) adds up to 47 inches a year; April is the wettest month and February the driest. Rain or snow falls on about 82 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Altenburg
74% 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 Jackson, MO.
Living with Altenburg’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
202 frost-free days in zone 7a. The last frost comes by Apr 7 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.
Parks & trails →Of the yearly building losses FEMA expects in Altenburg from natural hazards, river flooding is the largest share (31%); heat waves, cold waves, winter storms and ice storms together are 15%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Altenburg and similar climates
TownRatings has no climate map of the towns around Altenburg yet.
Climates most like Altenburg’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 |
|---|---|---|---|---|
| Altenburg, MO | 24° | 89° | 47" | 6.2" |
| Springdale, AR | 26° | 89° | 48" | 6.5" |
| Phoenixville, PA | 23° | 88° | 47" | 7.6" |
| Mount Rainier, MD | 26° | 88° | 45" | 5.8" |
| Clarksville, IN | 25° | 88° | 49" | 4.3" |
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 Altenburg averaged 0.9° warmer than the 1900s. The biggest change is in February (+1.7°).
A smaller shift than in 84% 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 Altenburg compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Altenburg’s place among Missouri’s.
Altenburg weather by month
Highs, lows and precipitation from NOAA’s grid at Altenburg’s center; snow, wet days and snow on the ground from Grand 2 N, IL. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 42° | 24° | 3.2" | 1.7" | 7 | 27° – 42° |
| February | 47° | 28° | 2.9" | 1.7" | 6 | 26° – 46° |
| March | 57° | 36° | 4.2" | 1.0" | 9 | 40° – 59° |
| April | 68° | 45° | 5.2" | 0.0" | 8 | 49° – 62° |
| May | 77° | 55° | 5.2" | 0.0" | 8 | 61° – 73° |
| June | 86° | 64° | 4.3" | 0.0" | 7 | 69° – 80° |
| July | 89° | 68° | 4.0" | 0.0" | 6 | 73° – 84° |
| August | 88° | 65° | 3.5" | 0.0" | 5 | 71° – 83° |
| September | 81° | 58° | 3.3" | 0.0" | 6 | 65° – 76° |
| October | 70° | 46° | 3.6" | 0.1" | 6 | 54° – 63° |
| November | 56° | 36° | 4.4" | 0.1" | 7 | 38° – 51° |
| December | 45° | 28° | 3.3" | 1.6" | 7 | 24° – 46° |
| Year | 67° | 46° | 46.8" | 6.2" | 82 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 24° to 46°. October is the most reliable, staying within 9°.
Where Altenburg’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 Altenburg’s center.
- Snow: Grand 2 N, IL.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Jackson, MO, 18 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 Altenburg’s climate
What is the weather like in Altenburg?
A typical July afternoon reaches 89°, a January night drops to 24°, and about 6 inches of snow falls in a normal winter. Milder January nights than 60% of U.S. towns; hotter July afternoons than 71% of U.S. towns.
How cold does it get in Altenburg in winter?
January nights average 24°. About 91 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 27°.
How much snow does Altenburg get?
About 6.2 inches in a normal winter at Grand 2 N, IL, most of it in January, February and December.
How hot does it get in Altenburg?
July, with a typical high of 89° and a low of 68°. About 57 days a year reach 90° and 2 reach 100° (Jackson, MO).
When is the first and last frost in Altenburg?
In half of years the last spring frost (32°) comes by April 7 and the first fall frost by October 29, about 202 frost-free days, at Jackson, MO.
What growing zone is Altenburg in?
Zone 7a 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 Altenburg?
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 Altenburg getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 84% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Altenburg.
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.