Microseason 6 of 72 · January 26–31
Chickadees announce dawn
A five-day window of the year, read through nine North American climate regions.
Same week, nine climates
A microseason names a five-day window of the solar year. What that window actually looks like on the ground depends on where you are. Below, the same calendar window read through each of nine North American climate regions.
- NENortheast Continental
Chickadees announce dawn
Black-capped chickadees sing their two-note spring song early.
- SESoutheast Subtropical
Last freeze locks the land
Final January cold returns; streams freeze again and frost coats tupelo swamps and longleaf pine forests.
- PNWPacific Northwest
The Fog Deepens
Heavy marine layer locks in place over the lowlands. Visibility drops to a quarter-mile. The entire world contracts to what you can touch.
- CACalifornia Mediterranean
Winter's grip releases
Late January warmth arrives with clear skies. Pollen counts spike. California poppy and lupine flowers now visible across coastal scrub. Monarch sightings increase.
- MWMountain West
Stream water crystallizes thick
Mountain brooks and creeks freeze completely; alpine lakes reach maximum ice depth; cold intensifies across all elevations.
- MPPlains Continental
Deep winter's pivot point
Ice thickens on streams; temperatures stabilize as the month wanes toward February.
- SWSouthwest Desert
Winter reaches its brightest point
Daytime highs 75-82°F, nights still 38-40°F. Clear skies, intense sunlight. Desert blooming is imminent; first Mexican gold poppies possible late month.
- TRTropical / Sub-Tropical
Last cold breath, green rising
End of January—final cool front possibility passes. Mangrove flowers fully open. Mahogany trees leaf out. The dry season is unmistakable: 7+ days without rain forecast.
- AKAlaska Subarctic
Month's end: darkness begins to fade
January closes with measurable light gain; Fairbanks gains 20+ minutes of twilight compared to solstice.
About the 72-microseason calendar
A microseason is a five-day window of the solar year — long enough to notice something change, short enough that the change is specific. The year holds seventy-two of them, six per month, ordered by what the natural world is doing rather than what the clock says. Almanac calendars like this are an old American habit, kept by farmers, gardeners, and birders for centuries; Weather Story collects them into a single reference.
Each microseason is read through nine North American climate regions. The phenological events that mark a five-day window vary with ecology — the strawberries that open in the Northeast might coincide with the first magnolias dropping in the Southeast and the salmonberry blossoms unfurling in the Pacific Northwest. Same week, nine ecologies, nine readings.