Length of 'Freeze Free' Season Probabilities


SEATTLE TCOMA WSCMO AP, WASHINGTON (457473)
Temp F Shortest 90% 80% 70% 60% 50% 40% 30% 20% 10% Longest
36.5 144 161 174 185 194 199 202 207 213 219 230
32.5 177 197 219 231 239 244 248 252 264 270 299
28.5 215 247 268 273 290 298 305 324 *** *** ***
24.5 251 295 303 337 *** *** *** *** *** *** ***
20.5 251 309 *** *** *** *** *** *** *** *** ***
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