| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
Hor. Global | 1.40 | 2.49 | 3.55 | 4.75 | 5.86 | 6.53 | 6.58 | 5.75 | 4.17 | 2.74 | 1.53 | 1.12 |
Hor. diffuse | 0.76 | 1.04 | 1.50 | 2.32 | 2.49 | 2.64 | 2.67 | 2.37 | 1.84 | 1.24 | 0.96 | 0.65 |
Clrn. index | 0.39 | 0.48 | 0.5 | 0.51 | 0.53 | 0.56 | 0.58 | 0.57 | 0.52 | 0.47 | 0.38 | 0.36 |
Amb. Temp. | −1 | 1.5 | 6.7 | 11.8 | 17.9 | 21.1 | 23.7 | 23.4 | 17.1 | 11.9 | 6.4 | 0.4 |