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December 2020 Weather and Climate Summary Forecast

December 4, 2020 | Weather & Climate Forecasts | 0 comments

Gregory V. Jones, Linfield University - December 3, 2020

Summary:

  • Seasonal temperatures were seen across the vast majority of the west coast states in November, while the rest of the Great Basin, Southwest, and Rockies were warmer than average[1] for the month.
  • While portions of the PNW saw near normal precipitation amounts in November, the bulk of the western US experienced a dry month.
  • The western US drought footprint continues to hover around 90%, with over 60% in severe to exceptional drought. The December forecast is for much of the west to remain dry, with the exception of portions of the PNW which is forecast to closer to average or slightly above average precipitation.
  • High pressure is in play at least for the first week to ten days of the month, bringing seasonal temperatures, dry conditions, and valley fog for the usual spots. The PNW will likely get some precipitation mid-month, but California and the rest of the west appears to likely see dry conditions continue.
  • La Niña conditions in the Tropical Pacific dominant the 90-day forecast from December to February, with the PNW across the northern states forecast to be near average to slightly cool and wet, and California and the central to southern states forecast to be warm and dry.

View the report (PDF) >>

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