| Temp | Probability of observing a temperature as cold, or colder, later in the spring or earlier in the fall than the indicated date. | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 10% | 30% | 50% | 70% | 90% | |||||||||||
| (°F) | spring | fall | season length* |
spring | fall | season length* |
spring | fall | season length* |
spring | fall | season length* |
spring | fall | season length* |
| 36 | 5/28 | 9/14 | 158 | 5/18 | 9/22 | 146 | 5/9 | 9/27 | 136 | 5/2 | 10/1 | 127 | 4/24 | 10/10 | 115 | 32 | 5/17 | 9/22 | 179 | 5/6 | 9/30 | 166 | 4/30 | 10/5 | 157 | 4/24 | 10/12 | 147 | 4/15 | 10/22 | 134 | 28 | 5/6 | 10/1 | 204 | 4/27 | 10/10 | 189 | 4/20 | 10/17 | 179 | 4/12 | 10/24 | 169 | 4/1 | 11/3 | 155 | 24 | 4/24 | 10/10 | 226 | 4/15 | 10/22 | 213 | 4/7 | 10/30 | 203 | 3/31 | 11/4 | 193 | 3/22 | 11/13 | 179 |
*Season length: number of days between last spring and first fall temperature thresholds, i.e. 36, 32, 28 and 24°F.