Length of 'Freeze Free' Season Probabilities


SILVERTON, OREGON (357823)
Temp F Shortest 90% 80% 70% 60% 50% 40% 30% 20% 10% Longest
36.5 125 141 155 162 169 175 178 180 186 196 225
32.5 167 188 198 200 207 216 225 231 239 247 259
28.5 208 237 249 261 266 271 274 284 303 324 ***
24.5 241 301 316 344 *** *** *** *** *** *** ***
20.5 280 *** *** *** *** *** *** *** *** *** ***
Graphic Output
 Shortest - Least number of consecutive days recorded with minimum temperature 
            above threshold.
            *** means minimum temperature below threshold has not occurred.

xx% - Percent probability that a consecutive number of days will occur with the minimum temperature not below the threshold. *** means non-occurrence of the threshold
Longest - Greatest number of consecutive days recorded with minimum temperature above threshold. *** means that at least one year occurred when minimum temperature below threshold was not recorded. Note: All periods include August 1.

Western Regional Climate Center, wrcc@dri.edu