Microseason 41 of 72 · July 21–25
Dog days settle in the haze
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
Dog days settle in the haze
Sirius rises with the sun — heat index peaks for the year.
- SESoutheast Subtropical
Dog days drape the earth in haze
July's deepest heat: oppressive humidity and haze blanket the region; thunderstorms become the sole relief.
- PNWPacific Northwest
Dog Days Hold
Heat and haze persist. Creeks shrink visibly. Salmon begin to show stress in warm pools. The green quiets—growth slows, birdsong falters at midday.
- CACalifornia Mediterranean
Peak fire season, peak heat
The driest, hottest period of the year; fire danger reaches critical; humidity crashes below 10% inland.
- MWMountain West
Pika caches reach their peak
Pikas intensify hayfeeding and caching behavior in boulder fields; mountain voles active in alpine meadow understory.
- MPPlains Continental
Dog days settle in haze
Peak summer heat and humidity; air quality degrades as ozone forms; prairie humidity rivals subtropical regions east of the Rockies.
- SWSouthwest Desert
Humidity weight
Dew points soar to 65°F+. The air becomes a living thing — thick, oppressive, inescapable. Ground stays wet through dawn. Night lows barely drop below 80°F.
- TRTropical / Sub-Tropical
The earth releases its breath — humidity peaks
Peak wet season. Mangrove pneumatophores submerged for hours daily. Forest floor flooded. Soil bacteria and fungi bloom. Air tastes green.
- AKAlaska Subarctic
Heat settles on interior valleys
Peak summer warmth hits interior Fairbanks and Susitna Valley; brief and intense heat wave with continuing midnight light.
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.