Have you seen your last 90° day? Has the first frost come yet? For 416 American cities, with
records that run back as far as the 1870s, here is the first and last hot day, warm night, freeze and snowfall of every season.
That history gives the odds of another one this year, and a guide to what the next 30 days normally bring.
LOADING
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Reading the station record…
This Season
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The Season, Every Year
The Odds, Day by Day
First to Last, Season by Season
EACH ROW IS ONE SEASON, NEWEST ON TOP
The Next 30 Days
WHAT THE CALENDAR NORMALLY BRINGS
Normal, Range and Records
NORMAL 1996–2025 · RECORDS OVER THE FULL RECORD
High: 1-in-10 low to 1-in-10 highLow: same rangeNormal highNormal low▲▼ records● observed
Across the Country
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Every City
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How this works. Each city is an RCC-ACIS threaded record (ThreadEx): one daily high/low/snowfall series per city,
joined across the station moves of the last century and a half, updated through yesterday. A season is the calendar year
for heat and warm nights, and July 1 – June 30 for freezes and snow, so the first freeze is the autumn one and the
last is the spring one. A season counts toward the odds only if at least 90% of its days were observed; the season in
progress never counts. "Chance of another" is the share of past seasons that had reached the threshold by this date
and reached it again afterwards. "Chance of a first" is the share of seasons still waiting on this date that
went on to get one. Odds and normal dates count every complete season on record unless you switch to 1996–2025; the map and table always use the full record. The daily 30-day normals average
a ±7-day window across those 30 years. Feb 29 is counted as Feb 28.
Data: NOAA Regional Climate Centers · Applied Climate Information System. Updated daily.