About what share of U.S. adults report having seasonal allergies?
Answerabout 1 in 4 (25%)
Seasonal allergies are somewhat less common in kids, at roughly 1 in 5.
Source: Climate Central / NEEF climatecentral.org
Nature · Facts & sources
Spring facts & stats
4 sourced facts about the spring season, each with the context behind the number. 4 more are in today's round and appear here after it closes.
The basics
Expert level
True or false: the spring equinox will land on March 21 in the mainland U.S. at some point before the year 2101.
AnswerFalse, not until 2101
Because of how leap years shift the calendar, the equinox keeps landing on March 19 or 20 for the rest of this century.
Source: The Old Farmer's Almanac (2024) almanac.com
Which U.S. city gained the most freeze-free growing days since the early 1970s?
AnswerReno, NV, +100 days
Reno's growing season lengthened more than any other city Climate Central tracked in its analysis.
Source: Climate Central climatecentral.org
A 2021 study found human-caused warming lengthened North American pollen season by about how many days between 1990 and 2018?
Answerabout 20 days
Warmer temperatures let plants start releasing pollen earlier and keep releasing it later into the year.
Source: Climate Central, citing a 2021 study (2021) climatecentral.org
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