This Friday, March 20, marks this year's first and only total eclipse of the sun, when the moon passes directly between Earth and the sun. Not only that, this is an extremely rare type of solar eclipse because it takes place on the first day of spring and when the moon is at its closest distance to Earth, known as a supermoon.
Relative Humidity in Toronto, Ontario, Canada. The average annual relative humidity is 61.1% and average monthly relative humidity ranges from 54% in July to 71% in January.
Optimum humidity levels are between 40% and 60% - but in any case they should be kept between 30% and 70%. Humidity levels below 40% will begin to cause problems for workers with conditions such as sinusitis. (Advice: from the CSA Standard CAN/CSA Z412-00 (R2005) - Office Ergonomics which gives acceptable ranges of temperature and relative humidity for offices in Canada.