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Station Data - Seasonal / Growing Season Statistics (shown), Growing Degree Days

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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Station Data - Seasonal Ranking

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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Station Data - Growing Season Products / Freeze Probabilities

Freeze Probabilities
URBANA (IL)
USC00118740
1981 - 2010

Figure 1: Probability of a Later Date in Spring shown - this product also generates charts for "Earlier Date Than Indicated" and "Longer Than Indicated Freeze Free Period"

Freeze Probabilities Fig. 1

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Station Data - Timing of Seasonal Events / Frost (shown), Seasonal Events

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.

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