Length of 'Freeze Free' Season Probabilities


WALLA WALLA 3 W, ta (458926)
Temp F Shortest 90% 80% 70% 60% 50% 40% 30% 20% 10% Longest
36.5 91 109 119 123 129 134 136 145 151 155 160
32.5 127 147 152 163 168 176 180 184 192 204 225
28.5 152 178 198 202 204 206 210 219 238 242 253
24.5 193 205 213 226 232 241 249 253 266 292 ***
20.5 211 236 249 272 288 293 314 *** *** *** ***
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