. There are few natural barriers to prairie winds, allowing them to sweep down from the Arctic in wintertime. The month with shortest days is December (Average daylight: 8.2h). Each place has a total for how many days of wet weather it usually gets a year and for the normal amount of precipitation. Months with the lowest UV index are January, February, November and December (UV index 1). Hello. You can jump to a separate table for each section of the province: Southeastern, Southwestern and Northern Manitoba. An unforgettable experience. The month with the least rainfall in Winnipeg, Canada, is January when the rain falls for 0.7 days and typically collects 0.2mm (0") of precipitation. Green, sometimes purple, red and yellow streaks of light colors the dark skies. We collected past weather data from many thousand weather stations around the world. The pristine wilderness is a mecca for walkers. Subscribe to our newsletter. Subscribe to our newsletter. The winter air in Winnipeg is so dry that many householders use humidifiers in their homes to add moisture back into the air.