Every May 22 I plant one watermelon seed. I water it, I fight slugs, I pray, I watch my beauty grow, and finally the day comes when the melon ripens. 

I then harvest and feast. Of course, some years are sad, like 1980, when a bluejay flew off with the seed. Anyway, six summers were a pure joy and for these I've tabulated the number of growing days versus the mean daytime temperature during the growing season. Does the temperature affect the growth rate? If so, represent this by an activation energy.

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Year Growing days Mean temp, °C 1976 87 22.0 1977 1982 1982 1984 1985 1988 85 74 78 90 84 23.4 26.3 24.3 21.1 22.7