Frost Dates: First and last frost dates for danbury, wi
The charts on this page show the probabilities of receiving a certain temperature on a certain day. Some examples that might help:
- You have a small 20% chance of getting 32° by September 13.
- There is a 50% chance of being hit by a 32° frost starting around September 21
- You have a 80% chance of seeing 32° by September 29
- Said another way, you have a 1 in 5 chance at making it to that day without a 32° night.
Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
---|---|---|---|---|---|---|---|---|---|
First 16° | Oct 20 | Oct 25 | Oct 29 | Nov 2 | Nov 5 | Nov 8 | Nov 11 | Nov 15 | Nov 21 |
First 20° | Oct 10 | Oct 15 | Oct 18 | Oct 21 | Oct 24 | Oct 27 | Oct 30 | Nov 2 | Nov 7 |
First 24° | Sep 28 | Oct 3 | Oct 7 | Oct 10 | Oct 14 | Oct 17 | Oct 20 | Oct 24 | Oct 29 |
First 28° | Sep 20 | Sep 23 | Sep 26 | Sep 28 | Sep 30 | Oct 2 | Oct 4 | Oct 6 | Oct 10 |
First 32° | Sep 8 | Sep 13 | Sep 16 | Sep 18 | Sep 21 | Sep 23 | Sep 26 | Sep 29 | Oct 3 |
First 36° | Aug 26 | Aug 31 | Sep 3 | Sep 6 | Sep 9 | Sep 11 | Sep 14 | Sep 18 | Sep 22 |
What's a safe temperature for tender plants? When the nightly temperature falls, frost can form, even above 32°, because the air is colder high above the ground and the frost can form up there and then fall down onto your garden and do some damage, even if it's 36° on the ground. So many factors come into play, including wind, concrete, houses, trees and other structures, etc etc etc. Because of all this, you might want to consider 36° as "the danger zone".
In your average springtime, you have a 90% chance that there will be no 36° nights by June 16. In other words, you can pretty much count on being safe from frost by that day. But we want to get those tomatoes in the ground as soon as possible, right? We see that there's still an 80% chance of 36° on May 28, so we don't dare plant that early. We wait a few days and by June 5 we are at the 50/50 point. At this point, we are close and we can start watching the weather forecast. If the upcoming week's forecast doesn't show below 40°, then it's probably okay to risk planting out your plants.
Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
---|---|---|---|---|---|---|---|---|---|
Last 16° | Apr 16 | Apr 13 | Apr 10 | Apr 8 | Apr 6 | Apr 4 | Apr 2 | Mar 30 | Mar 27 |
Last 20° | Apr 28 | Apr 23 | Apr 20 | Apr 17 | Apr 14 | Apr 12 | Apr 9 | Apr 5 | Apr 1 |
Last 24° | May 8 | May 3 | Apr 30 | Apr 27 | Apr 24 | Apr 21 | Apr 18 | Apr 14 | Apr 9 |
Last 28° | May 21 | May 17 | May 13 | May 11 | May 8 | May 6 | May 3 | Apr 30 | Apr 25 |
Last 32° | Jun 7 | Jun 1 | May 28 | May 25 | May 21 | May 18 | May 15 | May 11 | May 5 |
Last 36° | Jun 16 | Jun 12 | Jun 10 | Jun 7 | Jun 5 | Jun 3 | May 31 | May 28 | May 24 |
Data is provided by the NOAA National Centers for Environmental Information.