The weather in January

1 month has higher air pressure, lower temperature and lower relative humidity than July, corresponding to 2 (2,8 air pressure) 6( 1, 6 temperature) 7 (3,7 relative humidity). The maximum wind speed should appear in the afternoon, because the temperature difference is 5.

The direct heat source of troposphere atmosphere on the underlying surface. The direct cause of diurnal variation of temperature is ground radiation.