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Climate conditions before xylem differentiation are described by degree-day sum and total precipitation from twarming to the onset of xylogenesis, where twarming is the date when daily mean temperature warmer than 5 °C was recorded for five consecutive days
| 2009 | 2010 | 2011 | CV | |
|---|---|---|---|---|
| Degree-day sum | 291·6 | 442·5 | 301·9 | 24·4 % |
| Precipitation (mm) | 48·2 | 178·2 | 60·1 | 75·3 % |
CV, coefficient of variation.
