What is a microseason?

A microseason is a five-day window of the solar year named after a small natural event — first peach blossoms, longest shadows, the rotting grass becoming fireflies. Weather Story uses seventy-two of them as the editorial backbone for 'what season is it, really?' on every city page.

What happens during October 16–20?

October 16–20 is the October microseason 58 of 72. The phenological reading varies by climate region. In a representative Northeast Continental setting: Oaks color later than maples — a slow, deep transformation.

Does this microseason describe weather in North America?

Yes. Every microseason has been read for nine North American climate regions: Northeast Continental, Southeast Subtropical, Pacific Northwest, California Mediterranean, Mountain West, Plains Continental, Southwest Desert, Tropical Sub-Tropical, and Alaska Subarctic. The same calendar window looks different in each region; the page above shows all nine readings side-by-side.

Microseason 58 of 72 · October 16–20

Oaks turn bronze and russet

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
Oaks turn bronze and russet
Oaks color later than maples — a slow, deep transformation.
SESoutheast Subtropical
Crickets sing at dusk
Crickets chorus from doorsteps and thickets as oaks turn bronze and russet; the acoustic landscape transforms.
PNWPacific Northwest
Oaks turn russet
Garry oak and canyon live oak shift from green to bronze and russet. The deciduous understory thins; skeletal branches reveal forest structure.
CACalifornia Mediterranean
Chaparral embers glow
Fire season still intense. Late-October Santa Ana winds continue. Smoke drifts offshore most days.
MWMountain West
Elk bugling fades as rut nears its end
Bull elk still calling but with less urgency; the peak of the rut passing, exhaustion visible in their movements.
MPPlains Continental
Oaks turn bronze and russet
Oak savanna reaches peak color — bur oak, post oak in deep bronze and russet. Tallgrass prairie nearly dormant. Night lows in the 30s. Blankets of leaves dropping.
SWSouthwest Desert
Frost paints stones white
Hard freezes arrive; delicate frost coats rocks and low vegetation nightly.
TRTropical / Sub-Tropical
Atlantic storms retreat
Hurricane season's statistical peak has passed; named storms become less frequent, though late-season surprises remain possible.
AKAlaska Subarctic
Bears sealed in their winter dens
Hibernation complete; grizzly and black bears now dormant in deep sleep until spring breakup arrives.

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.

Same week, nine climates