Air temperature is one of the main properties of climate and the most easily measured, directly observable, and geographically consistent indicator of climate change. This indicator measures changes in minimum, average, and maximum temperature in degrees Celcius (°C) per century. Results are provided annually and for each of the four seasons for British Columbia and each of the nine terrestrial ecoprovinces.

• British Columbia has warmed an average of 1.4°C per century from 1900 to 2013. This is higher than the global average rate of 0.85°C per century. The northern regions of B.C. have warmed 1.6 to 2.0°C per century, twice the global average. Southern coastal regions have warmed 0.8°C per century, roughly equivalent to the global average rate.
• Most of the annual warming trend has occurred in the winter. The average temperature increase in winter across the province is 2.2°C per century. Winter temperatures have increased by 3.0 to 3.8°C per century in the north, 2.6 to 2.9°C per century in the north-central region and 1.5 to 1.7°C per century in central, interior and southeastern B.C.
• Annual maximum temperatures increased by an average of 0.7°C per century. Seasonal data indicate that maximum winter temperatures increased across most of B.C. Maximum spring temperatures are increasing in the north, but data do not reveal a trend in the southern half of B.C. No trends were detected for maximum temperature in the summer and fall.
• Annual minimum temperatures increased across B.C. an average of 2.0°C per century from 1900 to 2013. The greatest increase in minimum temperature has been in the Boreal Plains ecoprovince, where daily minimum temperature increased at a rate equivalent to 2.8°C per century.
• Seasonal data indicate that minimum temperatures increased across all of B.C. for all seasons. The average minimum temperature increased 3.1°C per century in winter for the province. In the Boreal Plains the minimum temperature increased at the greatest rate for all ecoprovinces, in all seasons.