Grey Winters and Mood in Washington: The Overcast West and the Colder, Sunnier East

People who move to Washington are usually warned about the rain. What catches many of them off guard is something else: weeks in which the sky never fully brightens, at a latitude where the winter day is already short. That experience is real, and it is not the same across the state. The Cascade Range divides Washington into two winter climates, and how a person’s mood behaves through the dark months often depends on which side they live on.

Short days are shared; grey skies are not

Latitude sets the length of the day, and Washington sits far north. Using the solar equations behind NOAA’s sunrise calculator, Seattle gets about eight and a half hours of daylight at the winter solstice and roughly sixteen in late June. Spokane, three hundred miles east, is at almost the same latitude, so its shortest day is nearly identical. Bellingham, near the Canadian border, is a little shorter again.

The difference between the two sides of the state is the sky. NOAA’s climate summary for Washington describes the Cascades as a physical barrier: Pacific moisture brings frequent precipitation west of the mountains, while the region east of the Cascades receives less. Washington State University’s meteorologists put it plainly — the west side has ample cloud cover and rain, mostly in winter, and central and eastern Washington see far fewer cloudy days. East-side winters are colder, with a greater swing in temperature across the year, but they are brighter.

Why low cloud matters for mood

The National Institute of Mental Health describes winter-pattern seasonal affective disorder as depression that recurs as days shorten in fall and winter and lifts in spring, and notes it is more common in people living farther north. Research summarized by NIMH points to daylight’s effect on serotonin and melatonin, the chemicals that help keep mood and the sleep–wake cycle in rhythm; with less light, those rhythms can fail to adjust.

A short day under a clear sky and a short day under unbroken cloud are not the same amount of light. West of the Cascades, a person can go a long stretch of winter without a bright morning, which is part of why the experience there feels heavier than the latitude alone would suggest. That is a reasonable reading of the mechanism, not a measured rate — no one can say from a weather map who will become depressed.

What the season can look like

NIMH lists the symptoms of depression — persistent low mood, loss of interest, fatigue, trouble concentrating, changes in sleep and appetite, hopelessness — and adds features typical of the winter pattern: oversleeping, craving carbohydrates with weight gain, and social withdrawal, the feeling of wanting to hibernate. Symptoms commonly last four to five months of the year.

• Getting up gets harder from about November, and weekends disappear into sleep
• Plans with friends drop away, not from conflict but from inertia
• Focus at work slips in a way that looks like an attention problem
• Spring arrives and, almost without noticing, you are yourself again

One season of feeling flat does not make a diagnosis. NIMH notes that seasonal affective disorder requires depressive episodes in a particular season for at least two consecutive years, more often than at other times of year. It is also distinct from holiday stress, which tracks the calendar rather than the light.

East of the mountains

Seasonal depression is not only a west-side story. Spokane, Yakima, and the Tri-Cities have the same short days, along with cold that keeps people indoors and roads that make an evening drive less appealing. Winter in the east tends to bring more isolation and less movement rather than months of overcast, and the effect on sleep and mood can be just as real. For someone who has recently moved from the coast to the east side, or the other way, the winter they knew may not be the winter they get.

Getting it evaluated

Light therapy, psychotherapy, antidepressant medication, and vitamin D are the treatment categories NIMH describes for winter-pattern seasonal affective disorder, used alone or together. Light boxes are sold without a prescription, but the timing and intensity matter, and people with a history of bipolar disorder in particular should talk with a clinician before starting one. Vitamin D is worth checking with a lab test rather than guessing.

A careful evaluation separates a seasonal pattern from depression that simply happens to be worse in winter, from a thyroid or sleep problem, and from a medication that stopped working. It also plans ahead: a regimen that is reviewed in September tends to hold better than one adjusted in February. Willow & Stone evaluates patients anywhere in Washington by secure video, which matters most in exactly the months when going out is least appealing. Our seasonal affective disorder page covers the condition in depth, and telepsychiatry across Washington explains how care works here.

Seasonal depression can be serious. Thoughts of death or suicide are never just the weather; they are a reason to reach out the same day.

• 988: call or text 988 at any hour. American Indian and Alaska Native people in Washington can press 4 after dialing 988, or text N8V to 988, to reach the Native & Strong Lifeline.
• 911 if anyone is in immediate danger.

Common Questions

Sources & Further Reading

• NIMH — Seasonal Affective Disorder
• NOAA NCEI — State Climate Summary: Washington
• Washington State University News — “Washington the cloudiest state – nope, says weather expert” (2015)
• Washington State Department of Health — 988 Suicide & Crisis Lifeline