Last September’s widespread flooding in northeast Colorado, which saw just over 17 inches of rain in one week in the city of Boulder, was not made more likely or more intense by the influence of human-induced climate change on atmospheric moisture.

Flash floods scoured Phoenix and surrounding areas on September 8, 2014. How did the rainfall totals compare to normal September precipitation?

It's the time of year for potentially toxic algae blooms in Lake Erie. But the stage for most blooms is set in spring.

October in Alaska this year was more like September, with warmth and rain in place of autumn chill and snow. Wind anomalies related to unusual pressure patterns conspired to bring a steady stream of warm, wet air from southerly latitudes into Alaska.

For much of Alaska, lack of snow, soaking rains, and record-warmth have made October feel more like September.

Through the first week of September 2013, Colorado was exceptionally warm and dry. By September 12, everything had changed.

The early wet season of 2010 was typical of La Niña, with rainfall in December 2010 between 200 and 400 percent above normal in much of Queensland, according to the Australian Bureau of Meteorology.