Olathe, Kansas climate: Normal weather by month, frost dates and records
Olathe's normal year runs from 21°F January nights to 88°F July afternoons, with 37.7 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.8°C, January lows of −6°C, July highs of 31°C, 959 mm of precipitation a year.
- NOAA stationOlathe Johnson County Exec Airport
- Station IDUSW00003967
- Location38.85°N 94.74°W
- Elevation1,070 ft (326 m)
- Population149,035
On October 23, the normal high in Olathe is 64°F and the normal low 44°F, and the chance of measurable rain or snow is 26%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Olathe.
- Jan 39° 21°
- Feb 44° 25°
- Mar 55° 35°
- Apr 65° 45°
- May 74° 55°
- Jun 83° 65°
- Jul 88° 69°
- Aug 87° 67°
- Sep 78° 59°
- Oct 67° 47°
- Nov 53° 35°
- Dec 42° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Olathe each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 21°F. The most precipitation falls in May (5.38 in), the least in January (1.06 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 39°F | 21°F | 30.0°F | 1.06 | 5 | <1 | 27 | 9 h 40 min |
| February | 44°F | 25°F | 34.5°F | 1.41 | 6 | <1 | 22 | 10 h 40 min |
| March | 55°F | 35°F | 45.1°F | 2.27 | 9 | <1 | 12 | 11 h 50 min |
| April | 65°F | 45°F | 54.8°F | 3.87 | 11 | <1 | 3 | 13 h 10 min |
| May | 74°F | 55°F | 64.6°F | 5.38 | 12 | 1 | <1 | 14 h 20 min |
| June | 83°F | 65°F | 74.0°F | 5.15 | 11 | 5 | <1 | 14 h 50 min |
| July | 88°F | 69°F | 78.2°F | 4.22 | 9 | 13 | <1 | 14 h 40 min |
| August | 87°F | 67°F | 77.0°F | 4.38 | 9 | 12 | <1 | 13 h 40 min |
| September | 78°F | 59°F | 68.4°F | 3.54 | 8 | 3 | <1 | 12 h 30 min |
| October | 67°F | 47°F | 56.7°F | 3.01 | 9 | <1 | 2 | 11 h 20 min |
| November | 53°F | 35°F | 44.0°F | 2.03 | 6 | <1 | 12 | 10 h 10 min |
| December | 42°F | 25°F | 33.8°F | 1.42 | 5 | <1 | 24 | 9 h 30 min |
| Year (annual) | 65°F | 46°F | 55.1°F | 37.74 | 101 | 33 | 101 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 4°C | −6°C | −1.1°C | 27 mm |
| February | 7°C | −4°C | 1.4°C | 36 mm |
| March | 13°C | 2°C | 7.3°C | 58 mm |
| April | 18°C | 7°C | 12.7°C | 98 mm |
| May | 23°C | 13°C | 18.1°C | 137 mm |
| June | 28°C | 18°C | 23.3°C | 131 mm |
| July | 31°C | 21°C | 25.7°C | 107 mm |
| August | 30°C | 20°C | 25.0°C | 111 mm |
| September | 26°C | 15°C | 20.2°C | 90 mm |
| October | 19°C | 8°C | 13.7°C | 76 mm |
| November | 12°C | 2°C | 6.7°C | 52 mm |
| December | 6°C | −4°C | 1.0°C | 36 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Overland Park (3 miles away), gets 14 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00003967; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Olathe?
Normal highs sit between 65°F and 85°F in May, June, September and October. Of those, September has the fewest days with rain (8).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00003967.
When is the last frost in Olathe?
In Olathe, the last spring frost (32°F) comes after April 8 in half of years and after April 23 in one year in ten; the first autumn frost comes before October 29 in half of years and before October 15 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 81 year in 10 after April 23; 9 in 10 after March 23
- First autumn frost, half of years before
- October 291 year in 10 before October 15; 9 in 10 before November 11
NOAA puts the median frost-free season at 204 days, and the season without a hard freeze (28°F) at 224 days.
A hard freeze (28°F) comes after March 30 in half of springs and before November 6 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Olathe in zone 6b across its 2 ZIP code areas (6b in 66061, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, Olathe's NOAA station is in zone 6b: the coldest night of a typical year reaches −3°F (24 complete years).
Frost dates for every NOAA station in Kansas · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00003967; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
What hardiness zone is each Olathe ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Olathe's 2 ZIP code areas are all in zone 6b. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Olathe?
In a normal year in Olathe, 33 days a year reach 90°F (2 of them 100°F or more), 101 nights fall to 32°F or colder and 101 days bring measurable precipitation.
- Days at 90°F or more
- 33a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 101a normal year
- Days that stay below freezing
- 24high of 32°F or less
- Days with 0.01 inch of precipitation
- 101a normal year
The highest temperature in this station's record (since 1996) is 110°F, on August 2, 2011; the lowest is −13°F, on February 16, 2021.
The wettest calendar year on that record is 2019, with 49.76 in.
Source: NOAA NCEI 1991-2020 annual normals, station USW00003967; records: ACIS (NOAA Regional Climate Centers), station USW00003967. Records use complete months only; a month missing more than three days is left out.
How sunny is Olathe?
Over a year 76% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Olathe, 4.3 kWh per square metre a day. July is the sunniest month (83%) and March the cloudiest (69%). Among the 459 U.S. places of 50,000 or more, that ranks tied 276th (with 27 others) in sunshine.
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 71% | 2.3 |
| February | 70% | 3.0 |
| March | 69% | 4.0 |
| April | 71% | 5.0 |
| May | 73% | 5.7 |
| June | 81% | 6.6 |
| July | 83% | 6.5 |
| August | 82% | 5.7 |
| September | 82% | 4.8 |
| October | 76% | 3.5 |
| November | 74% | 2.5 |
| December | 71% | 2.0 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Olathe need?
A normal year in Olathe brings 4,926 heating degree days, 8% fewer than the median U.S. place (5,373), and 1,351 cooling degree days, 49% more than the median (908). Six months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 4,035 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,086 | 0 |
| February | 853 | 0 |
| March | 620 | 3 |
| April | 320 | 16 |
| May | 105 | 93 |
| June | 6 | 278 |
| July | 0 | 409 |
| August | 1 | 373 |
| September | 51 | 152 |
| October | 285 | 27 |
| November | 633 | 1 |
| December | 967 | 0 |
| Year (annual) | 4,926 | 1,351 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00003967. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Olathe been warmer than normal lately?
2025 averaged 56.7°F, 1.6°F above the 1991-2020 normal of 55.1°F. 4 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 56.8°F | +1.7°F | 39.70 |
| 2022 | 55.9°F | +0.8°F | 34.61 |
| 2023 | 58.1°F | +3.0°F | 32.57 |
| 2025 | 56.7°F | +1.6°F | 31.27 |
Source: observed years: ACIS, station USW00003967. A year counts only with all twelve months complete.
How does Olathe's climate compare?
Olathe is warmer than 77 of the other 136 places with their own NOAA record in Kansas, and wetter than 100. Across the 7,247 U.S. stations with normals, its annual mean of 55.1°F is warmer than 61%.
In the Köppen classification computed from these normals, Olathe is Dfa: continental, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Olathe share this climate record?
10 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Grandview, MO26,630 people · 12 mi E
- Raymore, MO25,962 people · 15 mi E
- Belton, MO25,861 people · 11 mi E
- Peculiar, MO6,226 people · 17 mi SE
- Loch Lloyd, MO1,030 people · 8 mi E
- Cleveland, MO643 people · 14 mi SE
- Freeman, MO497 people · 20 mi SE
- Lake Annette, MO111 people · 19 mi SE
- Riverview Estates, MO78 people · 13 mi SE
- Bucyrus, KS16 people · 9 mi S
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Olathe's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Olathe. This page uses Olathe Johnson County Exec Airport; the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Olathe Johnson County Airport USW00093909 | 8 mi W | 1,087 ft | 55.1°F | 20°F | 89°F | 37.5 | – | April 13 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Olathe's climate
What is the coldest month in Olathe?
January, with a normal high of 39°F and a normal low of 21°F. The warmest is July (88°F by day, 69°F at night).
Does it snow in Olathe?
Yes. NOAA publishes no 1991-2020 snowfall normal for Olathe's NOAA station; the nearest record that keeps one, Overland Park (3 miles away), records 14 inches of snow in a normal year.
What is the rainiest month in Olathe?
May, with 5.38 in of precipitation in a normal year; the driest is January with 1.06 in.
What plant hardiness zone is Olathe in?
The USDA's 2023 map puts Olathe in zone 6b across its 2 ZIP code areas (6b in 66061, the largest). By the same method at Olathe's NOAA station, the coldest night of a typical year reaches −3°F (24 years, 1991-2020): zone 6b.
How late can frost come in Olathe?
In half of years the last 32°F night comes after April 8; in one year in ten it comes after April 23. Waiting until April 23 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Olathe in OctoberThis month day by day, its records and recent years
- Kansas climateThe statewide normals and every place in the state
- Overland Park, KS3 miles from this station, 55.1°F a year
- Hillsdale, KS15 miles from this station, 54.8°F a year
- Bonner Springs, KS17 miles from this station, 53.6°F a year
- Paola, KS19 miles from this station, 55.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made