Basehor climate

Basehor Frost Dates and Growing Season

NOAA 1991-2020 normals for Bonner Springs, 9.5 km from Basehor, elevation 850 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Bonner Springs. A median date has an even chance of a later freeze in spring, or an earlier one in fall.

The last spring freeze typically comes around April 16 and the first fall freeze around October 22, a growing season of about 188 days.

Median at 36°F
last April 28, first October 13
Median at 32°F
last April 16, first October 22
Median at 28°F
last April 5, first October 31

Last freeze in spring

The chance of a later freeze than the date shown. At 10 percent, one spring in ten still freezes after the date; planting after the 10 percent date for 32°F is the cautious choice.

Threshold10%20%30%40%50%60%70%80%90%
36°FMay 9May 5May 2Apr 30Apr 28Apr 25Apr 21Apr 17Apr 12
32°FMay 1Apr 26Apr 23Apr 20Apr 16Apr 13Apr 9Apr 5Apr 1
28°FApr 22Apr 16Apr 11Apr 8Apr 5Apr 2Mar 31Mar 27Mar 19
24°FApr 12Apr 6Apr 2Mar 31Mar 27Mar 23Mar 19Mar 14Mar 8
20°FApr 2Mar 28Mar 23Mar 19Mar 15Mar 11Mar 7Mar 3Feb 28
16°FMar 22Mar 16Mar 12Mar 8Mar 4Mar 2Feb 28Feb 24Feb 17

First freeze in fall

The chance of an earlier freeze than the date shown. At 10 percent, one fall in ten freezes before the date.

Threshold10%20%30%40%50%60%70%80%90%
36°FSep 29Oct 4Oct 8Oct 10Oct 13Oct 15Oct 17Oct 20Oct 24
32°FOct 9Oct 14Oct 17Oct 19Oct 22Oct 24Oct 26Oct 29Nov 2
28°FOct 17Oct 23Oct 25Oct 28Oct 31Nov 1Nov 4Nov 8Nov 14
24°FOct 27Nov 1Nov 3Nov 6Nov 9Nov 12Nov 15Nov 20Nov 28
20°FNov 2Nov 7Nov 11Nov 14Nov 19Nov 23Nov 27Dec 1Dec 5
16°FNov 10Nov 16Nov 21Nov 26Nov 30Dec 3Dec 6Dec 11Dec 16

Growing season length

Days between the last spring and first fall freeze at each threshold, with the chance of a season at least that long.

Threshold10%20%30%40%50%60%70%80%90%
36°F187180175172168164159155148
32°F208201197192188183179174167
28°F228221215210206203198193186
24°F251242237231226223218212204
20°F271263257252247242237231222
16°F292283277272267262256251244

How often it gets that cold

The share of years with at least one night at or below each temperature.

36°F or colder
100% of years
32°F or colder
100% of years
28°F or colder
100% of years
24°F or colder
100% of years
20°F or colder
100% of years
16°F or colder
100% of years

Degree days

A degree day is one degree of the daily mean temperature beyond a base, for one day. Heating degree days count cold (the fuel a house burns), cooling degree days heat, growing degree days the warmth a crop needs; each crop has its own base.

Heating degree days, base 65°F
5,358
Cooling degree days, base 65°F
1,226
Growing degree days, base 40°F
6,137
Growing degree days, base 45°F
4,883
Growing degree days, base 50°F
3,769
Growing degree days, base 55°F
2,789
Growing degree days, base 60°F
1,943

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,14701
February91109
March681360
April37011171
May13979413
June7253696
July1383846
August2332795
September70139520
October33125217
November673141
December1,02602

What this means

NOAA computes these from the daily lows at the station over 1991-2020, fitting the dates of each year's last and first freeze to a distribution, so a date can be stated at any level of risk. 36°F is a frost risk for tender plants on a clear, calm night, since the ground cools below the air above it; 32°F is a freeze; 28°F is a hard freeze that kills most annuals.

The station is 9.5 km from Basehor. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

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Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00140957 (Bonner Springs). Public domain.