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Growing Degree Days
SAMPLE CHART (spring 2004)

Measuring the Amount of Heat
Required For Our Tulips to Grow and Bloom

DATE

Today's Temperature

Base Temp. for Tulips

Today's
Growing Degree Day
Value

TOTAL
Growing Degree Days

Hi

Lo

Av

(Av. Temp) - (Base Temp)

= GDD

2/3/04

45

33

39

40 F

39- 40

-1

0

2/4/04

50

34

42

40 F

42 - 40

2

2

2/5/04

50

36

43

40 F

43 - 40

3

5

2/6/04

52

38

45

40 F

45 - 40

5

10

2/7/04

54

40

47

40 F

47 - 40

7

17

2/8/04

52

42

47

40 F

 

 

 

2/9/04

60

40

50

40 F

 

 

 

To Practice:

  • Fill in the values for 2/8/04 and 2/9/04. How many growing degrees have accumulated by 2/9/04?


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