Microseason 31 of 72 · June 1–5
Fireflies rise from the lawn
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
Fireflies rise from the lawn
Firefly displays begin in earnest in parks and backyards.
- SESoutheast Subtropical
Fireflies pulse through the magnolias
First fireflies emerge in soft June dusk, blinking above humid lawns and oak groves across the Piedmont and Coastal Plain.
- PNWPacific Northwest
Rufous Hummingbirds Arrive
Brilliant red males claim flowering currant and manzanita. Territorial chases spark in dawn light along the forest edge.
- CACalifornia Mediterranean
Coastal fog thickens at dawn
Marine layer settles over the coast each morning, mixing with the inland heat that will peak by afternoon.
- MWMountain West
Pikas hayfeeding in granite peaks
Alpine meadows emerge from snowmelt as marmots whistle and pikas begin caching vegetation for winter.
- MPPlains Continental
Prairie lightning bugs rise
Fireflies emerge across open grasslands and oak savanna edges, their bioluminescence visible in twilight above milkweed and clover.
- SWSouthwest Desert
Heat hardens the dust
Pre-monsoon drought intensifies — the driest week of the year. Creosote dominates in brittle browns, saguaro spines cast needle-sharp shadows. Cicadas emerge early.
- TRTropical / Sub-Tropical
First trades stir the ceiba canopy
Trade winds freshen at dawn. Plumeria crowns fill streets with fragrance. Hurricane season officially begins.
- AKAlaska Subarctic
Mosquitoes rise from snowmelt
Swarms of mosquitoes emerge from tundra pools as warming days accelerate snowmelt across the subarctic interior and coast.
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.