Riverview climate

Riverview Frost Dates and Growing Season

NOAA 1991-2020 normals for Cole Camp 3NW, 28.3 km from Riverview, elevation 1000 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Cole Camp 3NW. 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 13 and the first fall freeze around October 23, a growing season of about 191 days.

Median at 36°F
last April 25, first October 14
Median at 32°F
last April 13, first October 23
Median at 28°F
last April 1, first November 1

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 7May 3Apr 30Apr 28Apr 25Apr 22Apr 18Apr 14Apr 9
32°FApr 29Apr 23Apr 20Apr 16Apr 13Apr 9Apr 6Apr 3Mar 29
28°FApr 19Apr 11Apr 7Apr 4Apr 1Mar 30Mar 26Mar 22Mar 16
24°FApr 6Apr 1Mar 29Mar 25Mar 22Mar 19Mar 15Mar 11Mar 5
20°FMar 30Mar 23Mar 18Mar 14Mar 10Mar 8Mar 4Feb 28Feb 23
16°FMar 19Mar 14Mar 10Mar 7Mar 4Mar 1Feb 26Feb 21Feb 13

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 30Oct 5Oct 8Oct 11Oct 14Oct 17Oct 19Oct 21Oct 25
32°FOct 9Oct 14Oct 18Oct 20Oct 23Oct 24Oct 27Oct 30Nov 3
28°FOct 18Oct 23Oct 26Oct 30Nov 1Nov 3Nov 6Nov 9Nov 15
24°FOct 26Nov 1Nov 3Nov 6Nov 9Nov 12Nov 16Nov 21Nov 27
20°FNov 4Nov 9Nov 13Nov 17Nov 21Nov 25Nov 29Dec 2Dec 9
16°FNov 11Nov 18Nov 23Nov 27Nov 30Dec 2Dec 7Dec 13Dec 21

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°F188182177173170166162158150
32°F211204199195191187183178171
28°F232226220216212207202197189
24°F256247241236231227222216208
20°F275268262257252247241235228
16°F298290283278272267262254247

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
5,150
Cooling degree days, base 65°F
1,202
Growing degree days, base 40°F
6,243
Growing degree days, base 45°F
4,962
Growing degree days, base 50°F
3,819
Growing degree days, base 55°F
2,811
Growing degree days, base 60°F
1,936

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,12004
February881014
March667365
April35214189
May12782427
June8230672
July1375838
August3334796
September61136526
October31227232
November646149
December97308

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 28.3 km from Riverview. 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 USC00231748 (Cole Camp 3NW). Public domain.