Weather (in Celsius, approx.) :
Haaaa, weather... We often forget take it in consideration while planning the itinerary. Unless you love to get your brand new shoes dirty by indian mud, try to avoid the peak on the moonsoon. The beginning and end of the moonsoon doesn't cause problem, it rains a bit here and there during the day.
Moonsoon :
South Asia Jun-Sep; Oct-Dec
South-East Asia Jun-Oct
Australia Oct-Mar
East Africa Mar-May
Southern Africa Oct-Jun
However, here again it varies within a region and even within one country (like India and Vietnam). Check this link for precision :
World Countries Info.
Average temperature January
Canada -15
USA 10
Central and South America (except Argentina) 25
Argentina 15
North-West Europe 0
South-West Europe 10
Eastern Europe -5
Southern Siberia -10
North Africa 15 to 20
Southern Africa 30
Middle East 15
Northern Asia (China, Central Asia, Nepal, Buthan, North India)
0 to 10
South and South East Asia 25
Oceania 25
Average temperature July
Canada 25
USA 30
Central and South America (except Argentina) 30
Argentina 10
North-West Europe 20
South-West Europe 25
Eastern Europe 20
Southern Siberia 20
North Africa 30
Southern Africa 20
Middle East 30
Northern Asia (China, Central Asia, Nepal, Buthan, North India)
30
South and South East Asia 30
Oceania 15
For a detailed report :
Weather Base