Microseason 25 of 72 · May 1–5
Warblers flood the Ramble
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
Warblers flood the Ramble
Peak migration — 20+ warbler species in Central Park's Ramble.
- SESoutheast Subtropical
Warblers flood the canopy in waves
Peak warbler migration. Prothonotary, painted bunting, and scarlet tanager flash through budding trees. The forest sings.
- PNWPacific Northwest
Warblers Flood the Canopy
Peak warbler migration fills the high and mid-canopy: blackcap, Townsend's, orangecrowned, Wilson's, Macgillivray's. Low-angle sun illuminates leaf-out as maples and alder expand rapidly.
- CACalifornia Mediterranean
Coastal wildflowers at their peak
Late-spring wildflower bloom—buckwheat, sage, coast sunflower peak. Monarch breeding season underway. Marine layer mornings give way to brilliant afternoons.
- MWMountain West
Wildflowers crest the high meadows
Alpine wildflower waves—lupine, paintbrush, columbine—surge upslope with the snowmelt. Elk graze the emerging forbs.
- MPPlains Continental
Wildflowers Erupt Across the Prairie
Purple coneflower, prairie blazing star, and prairie clover bloom simultaneously; the prairie reaches peak spring color.
- SWSouthwest Desert
Monsoon signal fires light skies
Desert sky turns copper-red at sunset; wind shifts from south; humidity rises.
- TRTropical / Sub-Tropical
Lei Day—flowers crown the islands
May 1st: Hawaii celebrates lei day. Plumeria, ohia, and naupaka glow in bloom across the Pacific islands.
- AKAlaska Subarctic
Salmon in full ascent
Sockeye runs peak; reds crowd into river systems. Bears gather at streams; eagles circle overhead. Midnight sun begins in Barrow.
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.