Olathe, KS climate
Olathe has chilly winters and warm summers. A typical July afternoon reaches 89°, a January night drops to 20°, and about 14 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Olathe feels like
Winter
Spring
Summer
Fall
Olathe 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 | 30-yr range |
|---|---|---|---|---|---|---|
| January | 39° | 20° | 1.2" | 3.9" | 6 | 23° – 41° |
| February | 45° | 25° | 1.5" | 3.3" | 6 | 26° – 44° |
| March | 56° | 34° | 2.4" | 1.4" | 8 | 38° – 58° |
| April | 66° | 44° | 4.0" | 0.3" | 10 | 48° – 61° |
| May | 75° | 55° | 5.5" | 0 | 12 | 59° – 73° |
| June | 84° | 64° | 5.1" | 0 | 10 | 70° – 78° |
| July | 89° | 68° | 4.5" | 0 | 9 | 74° – 85° |
| August | 87° | 67° | 4.5" | 0 | 8 | 71° – 83° |
| September | 79° | 58° | 3.9" | 0 | 8 | 63° – 75° |
| October | 68° | 46° | 3.2" | 0.3" | 8 | 50° – 62° |
| November | 54° | 34° | 2.2" | 1.2" | 7 | 37° – 52° |
| December | 43° | 25° | 1.6" | 3.4" | 6 | 20° – 40° |
| Year | 65° | 45° | 39.6" | 13.8" | 97 |
“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 Olathe
Olathe gets 40 inches of rain and melted snow a year. May is the wettest month and January the driest. Rain or snow falls on about 97 days a year.
About 202 frost-free days a year
In half of years the last 32° night comes by April 10 and the first one by October 29. That leaves about 202 frost-free days for gardens, longer than 73% of U.S. towns.
Heating and cooling a home in Olathe
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Olathe, 78% of that work is heating and 22% 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.
Olathe and its neighbors
Olathe borders 9 towns with climate data. January nights across them vary by 0.5°. Lenexa has the coldest January nights (20°) and Lexington the hottest July afternoons (89°). Olathe’s January low is 20° and its July high 89°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Olathe 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 Olathe averaged 0.9° warmer than the 1900s. The biggest change is in March (+2.3°). The shift is smaller than in 75% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Olathe’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 20° to 40°. June is the most reliable, staying within 8°.
Common questions about Olathe’s climate
What is the coldest month in Olathe?
January, with a typical high of 39° and a low of 20°.
What is the hottest month in Olathe?
July, with a typical high of 89° and a low of 68°. About 34 days a year reach 90°.
How much snow does Olathe get?
About 14 inches in a normal winter, most of it in January.
When is the first frost in Olathe?
In half of years the first 32° night comes by October 29, and the last spring frost by April 10.
What is the rainiest month in Olathe?
May, with 5.5 inches of rain and melted snow. The year totals 40 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Olathe itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Olathe 3e, KS (3 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.