| 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 | 5/12 | 9/22 | 182 | 5/3 | 9/30 | 169 | 4/28 | 10/5 | 160 | 4/21 | 10/12 | 151 | 4/12 | 10/22 | 139 | 32 | 5/3 | 10/1 | 206 | 4/24 | 10/11 | 192 | 4/17 | 10/18 | 182 | 4/10 | 10/25 | 173 | 4/2 | 11/2 | 158 | 28 | 4/24 | 10/12 | 228 | 4/12 | 10/23 | 215 | 4/6 | 10/30 | 205 | 3/31 | 11/5 | 196 | 3/21 | 11/15 | 181 | 24 | 4/12 | 10/23 | 253 | 4/2 | 11/2 | 238 | 3/26 | 11/9 | 228 | 3/18 | 11/16 | 218 | 3/7 | 11/28 | 203 |
*Season length: number of days between last spring and first fall temperature thresholds, i.e. 36, 32, 28 and 24°F.