Table 1 Climatological data during the experiment period
Months | Avearage high temperature (°C) | Average low temperature (°C) | Average humidity (%) | Average rainfall (mm) | Average daylight (h) | Average sunshine (h) |
|---|---|---|---|---|---|---|
January | 10.2 | − 1.9 | 66 | 25.4 | 10.1 | 6 |
February | 13.6 | 0.6 | 58 | 20.5 | 11 | 6.9 |
March | 19.1 | 5 | 48 | 27.7 | 12 | 7.1 |
April | 26 | 10.5 | 42 | 20.2 | 13.1 | 7.8 |
May | 31.8 | 15.4 | 33 | 10.4 | 14 | 9.6 |
June | 37.9 | 20.2 | 24 | 2.3 | 14.5 | 11.7 |
July | 40.3 | 23.4 | 23 | 0.7 | 14.2 | 11.4 |
August | 39.4 | 21.2 | 24 | 0.3 | 13.4 | 11.2 |
September | 34.9 | 15.6 | 26 | 0.8 | 12.4 | 10.3 |
October | 27.7 | 10.3 | 38 | 6.2 | 11.3 | 8.5 |
November | 18.9 | 4.1 | 52 | 14.3 | 10.4 | 6.8 |
December | 12.2 | − 0.1 | 66 | 19.4 | 9.9 | 5.6 |