Some plants, shrubs and trees contain oils and resin that promote combustion, making them burn more easily. Finally, density and the arrangement of a fuel influences flammability. If the fuel is close together, the fire can spread quickly-unless the fuel is packed so tightly that it cuts off air circulation which will slow the blaze. Weather conditions include wind, temperature, humidity and rainfall. Wind is one of the most important factors because it can bring a fresh supply of oxygen and also push the blaze toward a new fuel source.
Temperature is important because fuels ignite and burn faster at higher temperatures.
When humidity levels are low, which means there is less water vapour in the air, fuels will be drier and will ignite faster. Fire Seasons Wildfire seasons vary according to location. May. Most fires in the New England states occur in late fall. In Ontario and Eastern Canada, most wildfires occur between April and October. Surface fires spread with a flaming front and burn leaf litter, fallen branches and other fuels located at ground level.