Warsaw climate

Warsaw Frost Dates and Growing Season

NOAA 1991-2020 normals for Wyoming 3W, 9 km from Warsaw, elevation 1559 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Wyoming 3W. 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 May 4 and the first fall freeze around October 17, a growing season of about 164 days.

Median at 36°F
last May 14, first October 6
Median at 32°F
last May 4, first October 17
Median at 28°F
last April 25, first October 30

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 27May 23May 20May 17May 14May 11May 8May 5Apr 30
32°FMay 19May 14May 10May 7May 4May 1Apr 29Apr 26Apr 22
28°FMay 8May 3May 1Apr 28Apr 25Apr 22Apr 19Apr 16Apr 11
24°FApr 28Apr 22Apr 18Apr 16Apr 12Apr 9Apr 7Apr 4Apr 1
20°FApr 15Apr 10Apr 6Apr 4Apr 3Apr 1Mar 29Mar 25Mar 19
16°FApr 5Apr 2Mar 30Mar 27Mar 23Mar 20Mar 18Mar 14Mar 10

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 26Sep 30Oct 2Oct 5Oct 6Oct 9Oct 11Oct 14Oct 19
32°FOct 4Oct 8Oct 11Oct 14Oct 17Oct 20Oct 23Oct 27Nov 1
28°FOct 14Oct 20Oct 24Oct 27Oct 30Nov 1Nov 4Nov 8Nov 12
24°FOct 28Nov 1Nov 4Nov 7Nov 10Nov 12Nov 15Nov 18Nov 24
20°FNov 6Nov 10Nov 13Nov 16Nov 19Nov 23Nov 26Dec 1Dec 5
16°FNov 13Nov 19Nov 23Nov 27Dec 1Dec 3Dec 6Dec 11Dec 18

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°F164157152148144140137133127
32°F185178172168164160155151144
28°F206200195191187183179172164
24°F229222218214210207202198191
20°F252246241236231228223219212
16°F272265259255250247242236229

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
7,363
Cooling degree days, base 65°F
297
Growing degree days, base 40°F
4,023
Growing degree days, base 45°F
3,009
Growing degree days, base 50°F
2,128
Growing degree days, base 55°F
1,369
Growing degree days, base 60°F
742

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,31400
February1,17700
March1,07201
April668033
May31311206
June7958429
July24111551
August4184508
September19229297
October517385
November822219
December1,14200

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 km from Warsaw. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

More

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00309593 (Wyoming 3W). Public domain.