Historical Climate Data

Growing Season Summary
Station: 200164 ALPENA WSO AIRPORT, MI

Growing Degree Day Averages
Derived from 1971-2000 Data

 

Element JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
GDD
Base 40
0 2 23 123 406 660 851 786 519 226 49 5 3657
GDD
Base 45
0 0 9 62 267 511 696 631 373 124 19 1 2696
GDD
Base 50
0 0 3 29 156 364 541 477 239 58 6 0 1876
GDD
Base 55
0 0 0 14 83 229 387 325 133 22 1 0 1196
GDD
Base 60
0 0 0 6 39 123 239 187 61 6 0 0 665
MGDD*
Base 50
0 1 19 88 256 409 543 496 308 129 25 3 2282

*Modified Growing Degree Days: Base 50 Ceiling 86.

Growing Season Summary
Derived from 1971-2000 Averages

  Date of Last Spring Occurrence Date of First Fall Occurrence
Base
Temp
°F
Median Early 90% 10% Late Median Early 90% 10% Late
32 5/26 5/04 5/11 6/07 6/19 9/24 8/29 9/15 10/08 10/10
30 5/14 4/27 5/05 6/05 6/12 9/29 8/29 9/18 10/11 10/16
28 5/08 4/25 4/27 5/20 5/26 10/10 9/18 9/26 10/27 11/01
24 4/23 4/07 4/12 5/04 5/09 10/28 10/03 10/11 11/11 11/15
20 4/09 3/23 3/28 4/22 4/29 11/10 10/24 10/28 11/25 12/14
16 4/05 3/14 3/19 4/11 4/14 11/20 10/28 11/09 12/08 12/18

Length of Growing Season (Days)
Derived from 1971-2000 Averages

Base
Temp
°F
Median Shortest 10% 90% Longest
32 124 86 102 143 154
30 139 86 113 154 163
28 153 129 135 170 184
24 189 148 169 209 216
20 219 186 194 231 264
16 232 201 218 256 268