Franklin R. Lanter House · Photo: Rmprit · CC BY-SA 3.0The climate in Olathe sits close to the middle of U.S. towns
Deep winter brings January lows near 20°. Its July heat outdoes that of 70% of U.S. towns. Warming shows here too: 0.9° more than in 1901–2000, led by March. Comfortable outdoor weather lasts from April to June and September to October, with highs of 66–84°.
A year in Olathe at a glance
Each month’s typical high and low, and what it brings.
What stands out about Olathe’s climate
Compared with towns across the U.S., with Olathe’s place in Kansas beside it.
What a year in Olathe feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 204 frost-free days a year
In half of years the last 32° night comes by April 8 and the first by October 29. Frost and day counts come from NOAA’s station at Olathe Johnson Co Exec Airport, 5 miles from the city’s center point, at about the same height.
The 2023 USDA map puts Olathe’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 14 inches of snow a winter
Snow, measured at Olathe 3e, KS, falls mostly in January. 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 97 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Olathe
78% of the work is heating. Months averaging under 55° run from November 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 Olathe Johnson Co Exec Airport.
Living with Olathe’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
204 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, June, September and October. 27 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Olathe from natural hazards, river flooding is the largest share (43%); heat waves, cold waves, winter storms and ice storms together are 27%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Olathe and its neighbors
Every town next door is within a degree of Olathe in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Olathe’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 |
|---|---|---|---|---|
| Olathe, KS | 20° | 89° | 40" | 14" |
| Troy, MO | 21° | 88° | 41" | 16" |
| Jerseyville, IL | 21° | 87° | 41" | 13" |
| Terre Haute, IN | 21° | 87° | 43" | 15" |
| Strasburg, VA | 23° | 87° | 39" | 21" |
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 Olathe averaged 0.9° warmer than the 1900s. The biggest change is in March (+2.3°).
A smaller shift than in 83% 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. In a city of 150,000 people, part of the change is the city itself: pavement and buildings hold heat (the urban heat island).
How Olathe compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Olathe’s place among Kansas’.
Olathe weather by month
Highs, lows and precipitation from NOAA’s grid at Olathe’s center; snow, wet days and snow on the ground from Olathe 3e, KS. 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" | 0.0" | 12 | 59° – 73° |
| June | 84° | 64° | 5.1" | 0.0" | 10 | 70° – 78° |
| July | 89° | 68° | 4.5" | 0.0" | 9 | 74° – 85° |
| August | 87° | 67° | 4.5" | 0.0" | 8 | 71° – 83° |
| September | 79° | 58° | 3.9" | 0.0" | 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 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 20° to 40°. June is the most reliable, staying within 8°.
Where Olathe’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 Olathe’s center.
- Snow: Olathe 3e, KS.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Olathe Johnson Co Exec Airport, 5 miles from the city’s center point, 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 Olathe’s climate
What is the weather like in Olathe?
A typical July afternoon reaches 89°, a January night drops to 20°, and about 14 inches of snow falls in a normal winter. Colder January nights than 57% of U.S. towns; hotter July afternoons than 70% of U.S. towns.
How cold does it get in Olathe in winter?
January nights average 20°. About 101 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 23°.
How much snow does Olathe get?
About 14 inches in a normal winter at Olathe 3e, KS, most of it in January.
How hot does it get in Olathe?
July, with a typical high of 89° and a low of 68°. About 33 days a year reach 90° and 2 reach 100° (Olathe Johnson Co Exec Airport).
When is the first and last frost in Olathe?
In half of years the last spring frost (32°) comes by April 8 and the first fall frost by October 29, about 204 frost-free days, at Olathe Johnson Co Exec Airport.
What growing zone is Olathe 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 Olathe?
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 Olathe getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 83% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Olathe.
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.