Tulip Test Gardens

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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