Length of 'Freeze Free' Season Probabilities


MERWIN DAM, WASHINGTON (455305)
Temp F Shortest 90% 80% 70% 60% 50% 40% 30% 20% 10% Longest
36.5 120 157 999 166 178 185 188 193 199 205 215
32.5 162 192 999 204 215 222 226 231 236 243 255
28.5 206 228 999 239 249 256 262 276 288 305 ***
24.5 207 251 999 277 295 301 308 318 *** *** ***
20.5 207 293 999 311 326 *** *** *** *** *** ***
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