Weather & climate
Weather & Climate Calculators
Practical, transparent calculations for outdoor planning, energy use, agriculture, and putting observations into climate context.
Heat Index Calculator
Apparent temperature from air temperature and humidity
Wind Chill Calculator
Environment Canada’s official wind chill formula
Degree Days Calculator
Heating, cooling, or growing degree days from daily temperatures
Frost-Free Season Calculator
Elapsed growing-season length between two frost dates
Climate Anomaly Calculator
Compare observations with a climate normal