Halloween weather can be highly variable depending on the year.
Sea level rise is causing more coastal flooding in the U.S. See how many floods have a human fingerprint in these cities.
Later frosts mean longer growing seasons for the U.S.
This is how much the average frost-free season has changed since 1970.
The decrease in cool nights is one feature of an overall fall warming trend.
Increases in heavy precipitation will threaten to worsen incidents of sewage overflows, especially in cities with aging sewage infrastructure.
The annual Arctic sea ice minimum extent has been below average every year since 2002.
Atlantic buoys have warmed 2°-4°F in the last 30 years.