Monarch Butterflies Growing Degree Days Date Soil Temperature Base Temperature TODAY'S Growing Degree Day Units* TOTAL Growing Degree Day Units     33 F         33 F         33 F         33 F         33 F         33 F         33 F         33 F         33 F         33 F         33 F         33 F         33 F         33 F         33 F         33 F         33 F         33 F         33 F         33 F         33 F     * Soil Temp - Base Temp = Today's GDD

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