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| Growing Season Statistics |
| GRAND RAPIDS INTL AP, MI |
| Threshold Temperature: 32.0 |
| Spring/Fall Cutoff Date: August 1 |
| Distribution: Normal |
| Last Spring Occurrence | First Fall Occurrence | ||||||||
| Year | Date | Temp | Missing | Date | Temp | Missing | Season Length | GDD | MGDD |
| 2008 | Apr 30 | 26 | 0 | Oct 22 | 29 | 0 | 174 | 2629 | 2788 |
| 2009 | Apr 23 | 29 | 0 | Oct 01 | 30 | 0 | 160 | 2425 | 2514 |
| 2010 | May 10 | 31 | 0 | Oct 22 | 30 | 0 | 164 | 2973 | 3028 |
| 2011 | Apr 18 | 29 | 0 | Oct 22 | 31 | 0 | 186 | 2979 | 3046 |
| 2012 | Apr 29 | 28 | 0 | Oct 08 | 32 | 0 | 161 | 3055 | 3009 |
| Earliest | Apr 18 | Oct 01 | 160 | ||||||
| Latest | May 10 | Oct 22 | 186 | ||||||
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| Ranking of Average Mean Temperature for Spring |
| Season: March 1 - May 31 |
| GRAND RAPIDS INTL AP, MI |
| Rank | Value | Year | |
| 1 | 46.2 | 2008 | |
| 2 | 46.8 | 2011 | |
| 3 | 47.7 | 2009 | |
| 4 | 52.1 | 2010 | |
| 5 | 54.1 | 2012 | * |
| Missing: |
| * current year |
| ** If more than 10% of the data is missing for a season, the season is not ranked. |
| T = Trace |
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| Frost Statistics |
| GRAND RAPIDS INTL AP, MI |
| Threshold Temperature: 32.0 |
| Spring/Fall Cutoff Date: August 1 |
| Distribution: Normal |
| Last Spring Occurrence | First Fall Occurrence | ||||||
| Year | Date | Temp | Missing | Date | Temp | Missing | Season Length |
| 2008 | Apr 30 | 26 | 0 | Oct 22 | 29 | 0 | 174 |
| 2009 | Apr 23 | 29 | 0 | Oct 01 | 30 | 0 | 160 |
| 2010 | May 10 | 31 | 0 | Oct 22 | 30 | 0 | 164 |
| 2011 | Apr 18 | 29 | 0 | Oct 22 | 31 | 0 | 186 |
| 2012 | Apr 29 | 28 | 0 | Oct 08 | 32 | 0 | 161 |
| Earliest | Apr 18 | Oct 01 | 160 | ||||
| Latest | May 10 | Oct 22 | 186 | ||||
| * Date is the date of the last spring/first fall occurrence of a minimum temperature less than or equal to the threshold. |
| A 'no' indicates no occurrence was recorded during the season. |
| A 'missing' indicates 18 or more days of missing data occurred before before an occurrence was found. |
| * Temp is the minimum temperature recorded on that day. |
| * Missing is the number of days with missing temperature data following the last spring occurrence or preceding the first fall occurrence of this temperature. |
| * Season Length is the number of days between the last spring and the first fall occurrences. |