Month Air temperature Relative humidity Daily solar radiation - horizontal Atmospheric pressure Wind speed Earth temperature Heating degree-days Cooling degree-days °C % kWh/m/d kPa m/s °C °C-d °C-d January 6.0 70.5% 2.39 100.8 2.8 6.3 362 7 February 7.7 70.9% 2.83 100.6 2.9 8.2 284 18 March 11.2 74.0% 2.93 100.2 2.9 11.9 213 64 April 16.8 76.9% 3.58 99.7 2.6 17.6 66 200 May 21.2 76.5% 4.28 99.2 2.5 22.0 7 344 June 24.4 80.3% 4.27 98.8 2.5 25.0 0 432 July 26.9 80.5% 5.09 98.7 2.5 27.3 0 532 August 26.1 81.9% 4.74 98.8 2.4 26.7 0 508 September 22.9 77.8% 4.16 99.4 2.6 23.5 0 394 October 18.4 70.0% 3.36 100.1 2.7 19.1 27 267 November 13.2 67.4% 2.98 100.5 2.8 13.6 140 115 December 8.2 65.8% 2.64 100.9 2.8 8.3 293 25 Annual 16.9 74.4% 3.60 99.8 2.7 17.5 1392 2906 Measured at (m) 10.0 0.0
