| STATION NAME |
Temp. Threshold (Farenheit) | SPRING DATE | FALL DATE | FREEZE-FREE PERIOD (DAYS) |
FREEZE/FROST PROBABILITY 4 | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
PROBABILITY LEVEL 1
| PROBABILITY LEVEL 2
| PROBABILITY LEVEL 3
| |||||||||
| 90% | 50% | 10% | 10% | 50% | 90% | 10% | 50% | 90% | |||
KNIGHTVILLE DAM
| 36° | May 23 | Jun 04 | Jun 16 | Sep 03 | Sep13 | Sep 24 | 116 | 100 | 85 | 55% |
| 32° | May 05 | May 19 | Jun 02 | Sep 11 | Sep 23 | Oct 05 | 146 | 126 | 106 | 48% | |
| 28° | Apr 21 | May 05 | May 19 | Sep 20 | Oct 05 | Oct 21 | 174 | 153 | 131 | 39% | |
LAWRENCE
| 36° | Apr 20 | May 04 | May 19 | Sep 24 | Oct 05 | Oct 16 | 172 | 153 | 134 | 44% |
| 32° | Apr 08 | Apr 20 | May 02 | Oct 08 | Oct 20 | Nov 01 | 200 | 182 | 164 | 36% | |
| 28° | Mar 25 | Apr 07 | Apr 19 | Oct 18 | Nov 03 | Nov 18 | 229 | 210 | 190 | 27% | |
MIDDLETON
| 36° | Apr 21 | May 09 | May 28 | Sep 12 | Sep 27 | Oct 12 | 168 | 140 | 112 | 44% |
| 32° | Apr 06 | Apr 27 | May 17 | Sep 25 | Oct 11 | Oct 27 | 195 | 167 | 138 | 35% | |
| 28° | Mar 27 | Apr 11 | Apr 27 | Oct 05 | Oct 25 | Nov 15 | 227 | 196 | 166 | 27% | |
NANTUCKET FAA
| 36° | Apr 20 | May 09 | May 27 | Oct 01 | Oct 19 | Nov 07 | 193 | 163 | 134 | 37% |
| 32° | Apr 03 | Apr 18 | May 02 | Oct 16 | Nov 03 | Nov 22 | 226 | 199 | 172 | 28% | |
| 28° | Mar 21 | Apr 04 | Apr 18 | Oct 29 | Nov 15 | Dec 03 | 252 | 225 | 198 | 19% | |
NEW BEDFORD
| 36° | Apr 04 | Apr 18 | May 03 | Oct 10 | Oct 25 | Nov 08 | 210 | 188 | 167 | 33% |
| 32° | Mar 23 | Apr 06 | Apr 20 | Oct 22 | Nov 10 | Nov 28 | 243 | 217 | 191 | 24% | |
| 28° | Mar 12 | Mar 26 | Apr 08 | Nov 06 | Nov 22 | Dec 09 | 267 | 241 | 216 | 17% | |
PLYMOUTH
| 36° | Apr 28 | May 15 | Jun 01 | Sep 22 | Oct 03 | Oct 13 | 163 | 140 | 117 | 43% |
| 32° | Apr 11 | May 02 | May 23 | Oct 04 | Oct 16 | Oct 27 | 191 | 166 | 141 | 35% | |
| 28° | Mar 30 | Apr 16 | May 03 | Oct 16 | Nov 02 | Nov 18 | 229 | 199 | 169 | 26% | |
ROCHESTER
| 36° | May 03 | May 17 | Jun 01 | Sep 13 | Sep 26 | Oct 09 | 150 | 131 | 111 | 47% |
| 32° | Apr 16 | May 04 | May 22 | Sep 24 | Oct 09 | Oct 23 | 183 | 157 | 131 | 39% | |
| 28° | Apr 07 | Apr 23 | May 08 | Oct 09 | Oct 21 | Nov 03 | 201 | 181 | 161 | 30% | |
ROCKPORT 1 ESE
| 36° | Apr 15 | Apr 30 | May 15 | Oct 03 | Oct 15 | Oct 27 | 185 | 167 | 148 | 40% |
| 32° | Apr 07 | Apr 19 | May 01 | Oct 14 | Oct 26 | Nov 07 | 207 | 189 | 171 | 31% | |
| 28° | Mar 24 | Apr 05 | Apr 17 | Oct 27 | Nov 12 | Nov 27 | 242 | 220 | 198 | 23% | |
SPRINGFIELD
| 36° | Apr 22 | May 07 | May 23 | Sep 20 | Oct 05 | Oct 20 | 174 | 150 | 127 | 43% |
| 32° | Apr 08 | Apr 19 | Apr 29 | Sep 29 | Oct 15 | Oct 31 | 196 | 179 | 161 | 35% | |
| 28° | Mar 25 | Apr 06 | Apr 19 | Oct 11 | Oct 29 | Nov 16 | 227 | 205 | 183 | 26% | |
STOCKBRIDGE
| 36° | May 22 | Jun 04 | Jun 16 | Aug 28 | Sep 12 | Sep 27 | 118 | 100 | 82 | 53% |
| 32° | May 8 | May 23 | Jun 06 | Sep 10 | Sep 23 | Oct 06 | 144 | 123 | 102 | 46% | |
| 28° | Apr 18 | May 04 | May 20 | Sep 21 | Oct 06 | Oct 22 | 177 | 154 | 131 | 37% | |
TAUNTON
| 36° | May 10 | May 24 | Jun 08 | Sep 10 | Sep 21 | Oct 03 | 137 | 119 | 120 | 48% |
| 32° | Apr 27 | May 11 | May 26 | Sep 13 | Sep 29 | Oct 15 | 159 | 139 | 120 | 40% | |
| 28° | Apr 08 | Apr 23 | May 08 | Sep 29 | Oct 11 | Oct 23 | 190 | 170 | 150 | 31% | |
TULLY LAKE
| 36° | May 16 | Jun 02 | Jun 18 | Aug 29 | Sep 13 | Sep 27 | 127 | 102 | 77 | 55% |
| 32° | May 03 | May 20 | Jun 05 | Sep 09 | Sept 23 | Oct 07 | 150 | 126 | 102 | 47% | |
| 28° | Apr 17 | May 03 | May 19 | Sep 21 | Oct 08 | Oct 24 | 183 | 157 | 131 | 38% | |
WORCESTER WSO
| 36° | Apr 27 | May 10 | May 23 | Sep 21 | Oct 03 | Oct 16 | 163 | 145 | 127 | 46% |
| 32° | Apr 14 | Apr 27 | May 11 | Oct 02 | Oct 17 | Nov 01 | 193 | 172 | 151 | 39% | |
| 28° | Apr 07 | Apr 14 | Apr 26 | Oct 11 | Oct 26 | Nov 10 | 213 | 194 | 176 | 31% | |
- % Probability of a later date in the spring (through July 31) than the date indicated. In other words, the percent chance that a temperature at or below the indicated threshold level will occur after the corresponding spring date.
- % Probability of an earlier date in the fall (beginning August 31) than the date indicated. In other words, the percent chance that a temperature at or below the indicated threshold level will occur before the corresponding fall date.
- % Probability of a longer than indicated freeze/frost-free period. In other words, the percent chance that that period of days with temperatures above the indicated threshold level will exceed the corresponding number of days listed in the table.
- Probability of a freeze/frost day within the yearly period. In other words, the average percentage of days in the year with temperatures at or below the corresponding threshold temperature.
PLEASE NOTE: This data is intended for use as general guidelines for your location; actual frost dates vary (sometimes considerably) from year to year. Station temperature readings are commonly made at a height of approximately five feet, and actual ground temperatures can be up to 4° F to 8° F less. Thus, ground frost can occur even when the measured temperature is 36° F. Site specifics, radiational cooling, and air drainage, as well as other factors, will all have influence over actual frost dates at your location.
The preceding was excerpted from Koss, W.J. et.al. Climatography of the U.S No. 20, Supplement No. 1: Freeze Frost Data. Published by the National Oceanic and Atmospheric Administration (NOAA), 1988.