At 3:15 am on October 12th, the temperature at the UW weather station went below zero for the first time this fall. This is about the average date for the first frost for the last 16 years. Note that this is the temperature recorded at the 2 m height of the temperature instrument, thus it is possible that the temperature would have been below zero close to the ground surface before this date. A more precise term would probably be "air frost" for what we measure at the station.
See a full explanation here:
http://about.metservice.com/our-company/learning-centre/frost/
The last time is was below zero at the station was April 27 giving a growing season length of 168 days, which is a little longer than the average for the last 16 years which is 160 days.
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