more from the ragweed report:

The increase in the length of the ragweed season ranged from one extra day in the southern part of the range (Oklahoma). It increased in a linear fashion to the north where it was 16 days longer in Minnesota, and 25 days longer in Manitoba.

> Overall, these data indicate a significant increase in the length of the ragweed pollen season by as much as 13–27 days at latitudes above 44°N since 1995.

The current study illustrates, on a continental scale,
a clear association between recent warming, and an increase in
the duration of ragweed pollen season, a major aeroallergen.
Furthermore, this finding regarding surface temperatures and
allergy season length is consistent with the IPCC projections of
disproportionate warming at higher latitudes

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