May 22, 2014

Map of the week

GDD Base 0 May192014
GDD Base 0 May192014 legend

The AAFC map above shows accumulated growing degree days (GDDs) as of May 19. Click here to create your own AAFC weather maps.

GDDs are calculated by averaging daily maximum and daily minimum temperatures for each day, and subtracting the assumed minimum temperature (in this case Base 0) required for growth to proceed. A day with a high of 20°C and a low of 10°C would contribute 15 GDDs on a Base 0 scale.

Accumulated GDDs to date (as shown on the map) would not count toward canola seeded today. Napus seeded today would need roughly another 1,500 GDDs to reach maturity.

Growing Degree Days (GDDs) Base 0°C required to reach various growth stages for Napus and Rapa canola.
Growing Degree Days (GDDs) Base 0°C required to reach various growth stages for Napus and Rapa canola.

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