SeaTac Weather in December, USA

SeaTac Averages December

SEATAC AVERAGES FOR DECEMBER

• 

  What is Average Temperature?

  ---

  The average high temperature and the average low temperature for that month, on a daily basis, divided by 2 equals the average temperature for that month

  Temperature

  4°C

  40°F
• 

  What is Average High Low Temperature?

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  The sum of high temperatures/low temperatures divided by the number of days in that month, recorded daily

  High Temperature

  7°C

  45°F
• 

  What is Average High Low Temperature?

  ---

  The sum of high temperatures/low temperatures divided by the number of days in that month, recorded daily

  Low Temperature

  2°C

  36°F
• 

  What is Average Rainfall?

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  The amount of mm in rain for that month divided by the number of days, and the number of days that it rains during that month on average, over a given period of years

  Rainfall Days

  20 days
• 

  What is Average Rainfall?

  ---

  The amount of mm in rain for that month divided by the number of days, and the number of days that it rains during that month on average, over a given period of years

  Rainfall

  130 mm