December 1st, 2025 Timelapse
December 1st began under a thick blanket of clouds, with nearly complete cloud cover at 100%. Low clouds dominated the sky at around 92%, while mid-level clouds were also prevalent at 88%. This extensive cloud cover was accompanied by cool temperatures averaging 36.4°F. Winds were quite gentle at the surface, averaging just 0.8 mph, and slightly stronger aloft at 100 meters, where they averaged 1.2 mph. The winds at both altitudes experienced several shifts in direction, creating a dynamic environment in which the low clouds began to drift. With the wind so light, there was little movement in terms of cloud dynamics, and although precipitation was absent, the sky felt heavy with moisture.
As the day progressed into midday, the scene transformed significantly. By this time, the surface winds had inched up to an average of 1.1 mph, while winds at 100 meters saw a slight increase to 1.3 mph. The cloud cover remained dense, with 96.5% coverage, but a striking shift occurred as the low clouds practically vanished, dropping to just 14%. Meanwhile, the high clouds continued to dominate, making up nearly all of the remaining cloud cover. This substantial change allowed for the high clouds to move rapidly across the sky, driven by the stronger winds aloft, which showed signs of conflicting directions compared to the near-still surface winds. The turbulence created by these differing wind patterns contributed to some minor but noticeable layering effects, as the high clouds raced in varied directions, creating a textured appearance against the muted winter sky.
As evening approached, the weather showcased its final transformations. The surface winds remained mild, holding steady at an average of 1.1 mph, while winds at 100 meters picked up to 2.1 mph. This subtle increase brought a bit more life to the atmosphere, but cloud cover remained significant at 96.3%. While the low clouds persisted at a mere 0.3%, mid-level clouds made a modest appearance at 13.7%, and high clouds continued to blanket the sky at 96.0%. The turbulent interactions between the wind layers persisted, resulting in a mesmerizing tapestry of high-altitude clouds that drifted swiftly, creating a captivating visual display. Overall, the day’s weather highlighted the fascinating interplay between calm surface conditions and the more dynamic upper atmosphere, showcasing the rich complexity of Northwest skies during the winter months.
December 1st, 2025 Timeline
Screenshots with weather data (wind layers, clouds, precipitation)
Weather Info for December 1st, 2025
Sunset: 4:28 PM