Iatan, MO climate
Iatan has chilly winters and warm summers. A typical July afternoon reaches 89°, a January night drops to 19°, and about 17 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeRight about normal today. The forecast high is 72°, and a typical Oct 1 in Iatan peaks around 73°.Live forecast: National Weather Service · Normal: NOAA 1991–2020
What a year in Iatan feels like
Winter
Spring
Summer
Fall
Iatan weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 38° | 19° | 0.9" | 5.0" | 5 | 8 | 22° – 40° |
| February | 44° | 24° | 1.3" | 4.8" | 5 | 7 | 24° – 43° |
| March | 55° | 34° | 2.2" | 1.8" | 7 | 2 | 37° – 59° |
| April | 66° | 43° | 3.8" | 0.4" | 10 | 0 | 47° – 60° |
| May | 76° | 54° | 5.1" | 0 | 11 | 0 | 59° – 74° |
| June | 85° | 64° | 5.1" | 0 | 10 | 0 | 70° – 78° |
| July | 89° | 68° | 4.8" | 0 | 9 | 0 | 74° – 84° |
| August | 87° | 66° | 4.2" | 0 | 8 | 0 | 71° – 82° |
| September | 80° | 57° | 3.6" | 0 | 8 | 0 | 63° – 75° |
| October | 67° | 45° | 3.2" | 0.3" | 7 | 0 | 50° – 61° |
| November | 53° | 33° | 1.9" | 0.9" | 5 | 1 | 36° – 51° |
| December | 42° | 24° | 1.4" | 3.8" | 5 | 5 | 19° – 40° |
| Year | 65° | 44° | 37.4" | 17.0" | 89 | 23 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Iatan
Iatan gets 37 inches of rain and melted snow a year. June is the wettest month and January the driest. Rain or snow falls on about 89 days a year. Snow covers the ground about 23 days of the year.
About 199 frost-free days a year
In half of years the last 32° night comes by April 11 and the first one by October 29. That leaves about 199 frost-free days for gardens, longer than 72% of U.S. towns.
Heating and cooling a home in Iatan
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Iatan, 79% of that work is heating and 21% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Iatan compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Iatan averaged 1.0° warmer than the 1900s. The biggest change is in March (+2.4°). The shift is smaller than in 68% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Iatan’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. March swings the most: between 1991 and 2020 its average temperature ranged from 37° to 59°. June is the most reliable, staying within 9°.
Common questions about Iatan’s climate
What is the coldest month in Iatan?
January, with a typical high of 38° and a low of 19°.
What is the hottest month in Iatan?
July, with a typical high of 89° and a low of 68°. About 38 days a year reach 90°.
How much snow does Iatan get?
About 17 inches in a normal winter, most of it in January.
When is the first frost in Iatan?
In half of years the first 32° night comes by October 29, and the last spring frost by April 11.
What is the rainiest month in Iatan?
June, with 5.1 inches of rain and melted snow. The year totals 37 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Iatan itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Atchison, KS (9 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.