Microseason 39 of 72 · July 11–15
Thunder builds each afternoon
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
Thunder builds each afternoon
Sea-breeze convergence triggers daily convective storms.
- SESoutheast Subtropical
Thunder builds each drowsy afternoon
July's height: thunderstorms arrive like clockwork each day, flooding the Piedmont and Coastal Plain with deluges.
- PNWPacific Northwest
Red Huckleberry Ripens
Translucent red berries cluster thickly on drooping branches in moist draws. Bears move into berry-rich creek bottoms; ravens follow to cache surplus.
- CACalifornia Mediterranean
Pacific high settles in firmly
The subtropical high-pressure dome locks over California; coastal fog intensifies while inland heat escalates.
- MWMountain West
Lightning crowns every peak
Peak monsoon intensity; daily thunderstorms build reliably over alpine summits, bringing spectacular lightning and brief torrential rain.
- MPPlains Continental
Thunder builds every afternoon
July's heat and humidity peak; towering cumulus clouds build daily over the plains, spawning severe thunderstorms, hail, and occasional tornadoes.
- SWSouthwest Desert
The lightning oracle speaks
Peak monsoon violence. Cloud tops tower 50,000 feet. Lightning frequency reaches one strike per second within visible range. Hail and flash floods carve new arroyos.
- TRTropical / Sub-Tropical
Storm surge begins its rhythm
Afternoon thunderheads tower to 50,000 feet. Downbursts shake mangrove canopies. Tidal surges pool freshwater inland. Breeding cycles accelerate.
- AKAlaska Subarctic
Thunderstorms gather on summer peaks
Afternoon convection develops into brief, intense Pacific-fed storms that drench coastal ranges and interior valleys.
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.