Figure 1. Environmental conditions during the breeding season for northern Manitoba and southeastern Ontario.

Differences in A) temperature (°C), B) precipitation (mm) (includes both rain and snow), C) wind speed (km/h,) and D) relative humidity (%) between northern Manitoba (filled circles) and southeastern Ontario (un-filled circles). Circles represent averaged monthly values for 1971–2000± SD (standard deviation data only available for temperature); temperature data for 2009 are shown as triangles (all environmental data were collected from Environment Canada 2010). Northern Manitoba is typically, colder, drier and windier than southeastern Ontario, with comparable levels of humidity.