Lake View Frost Dates and Growing Season
Frost and the growing season
NOAA's 1991-2020 freeze probabilities for Sac City. 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 30 and the first fall freeze around October 6, a growing season of about 158 days.
- Median at 36°F
- last May 8, first September 28
- Median at 32°F
- last April 30, first October 6
- Median at 28°F
- last April 19, first October 17
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.
| Threshold | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 21 | May 16 | May 13 | May 11 | May 8 | May 7 | May 4 | May 2 | Apr 28 |
| 32°F | May 11 | May 7 | May 4 | May 2 | Apr 30 | Apr 28 | Apr 24 | Apr 20 | Apr 15 |
| 28°F | May 2 | Apr 28 | Apr 25 | Apr 22 | Apr 19 | Apr 17 | Apr 13 | Apr 9 | Apr 5 |
| 24°F | Apr 23 | Apr 18 | Apr 14 | Apr 11 | Apr 9 | Apr 6 | Apr 3 | Mar 31 | Mar 25 |
| 20°F | Apr 16 | Apr 10 | Apr 6 | Apr 3 | Apr 1 | Mar 29 | Mar 25 | Mar 21 | Mar 15 |
| 16°F | Apr 7 | Apr 2 | Mar 30 | Mar 25 | Mar 22 | Mar 18 | Mar 15 | Mar 11 | Mar 7 |
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.
| Threshold | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 16 | Sep 19 | Sep 22 | Sep 25 | Sep 28 | Sep 30 | Oct 3 | Oct 6 | Oct 10 |
| 32°F | Sep 23 | Sep 28 | Oct 1 | Oct 4 | Oct 6 | Oct 10 | Oct 12 | Oct 16 | Oct 20 |
| 28°F | Oct 4 | Oct 8 | Oct 12 | Oct 15 | Oct 17 | Oct 19 | Oct 22 | Oct 25 | Oct 30 |
| 24°F | Oct 15 | Oct 19 | Oct 22 | Oct 25 | Oct 28 | Oct 30 | Nov 1 | Nov 3 | Nov 8 |
| 20°F | Oct 23 | Oct 28 | Oct 31 | Nov 2 | Nov 4 | Nov 6 | Nov 9 | Nov 13 | Nov 18 |
| 16°F | Nov 1 | Nov 3 | Nov 6 | Nov 9 | Nov 12 | Nov 16 | Nov 19 | Nov 24 | Nov 29 |
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.
| Threshold | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | 158 | 153 | 149 | 144 | 142 | 138 | 134 | 129 | 123 |
| 32°F | 179 | 171 | 167 | 162 | 158 | 155 | 151 | 148 | 142 |
| 28°F | 200 | 193 | 189 | 184 | 180 | 176 | 172 | 167 | 161 |
| 24°F | 220 | 213 | 207 | 203 | 200 | 196 | 192 | 187 | 179 |
| 20°F | 237 | 230 | 225 | 222 | 217 | 212 | 208 | 203 | 196 |
| 16°F | 256 | 249 | 243 | 239 | 233 | 229 | 225 | 220 | 212 |
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
- 7,371
- Cooling degree days, base 65°F
- 683
- Growing degree days, base 40°F
- 4,773
- Growing degree days, base 45°F
- 3,717
- Growing degree days, base 50°F
- 2,776
- Growing degree days, base 55°F
- 1,950
- Growing degree days, base 60°F
- 1,249
Growing degree days by month, base 50°F
Heating and cooling by month
| Month | Heating DD | Cooling DD | Growing DD 50 |
|---|---|---|---|
| January | 1,485 | 0 | 0 |
| February | 1,219 | 0 | 1 |
| March | 963 | 0 | 15 |
| April | 553 | 4 | 79 |
| May | 239 | 38 | 289 |
| June | 36 | 155 | 569 |
| July | 8 | 239 | 696 |
| August | 21 | 173 | 617 |
| September | 145 | 66 | 381 |
| October | 488 | 8 | 118 |
| November | 908 | 0 | 13 |
| December | 1,307 | 0 | 0 |
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 13.5 km from Lake View. 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 USC00137312 (Sac City). Public domain.