On October 11, 2017 at dusk while standing in my backyard I notice the first fog of the fall form from my breath. On cue a flock of geese fly past heading directly South. The crickets, humming every evening since August, are silent.
Curious about the changes temperature brings I noted that it was 47 degrees Fahrenheit, or 8 degrees Celsius with 88% humidity. Indeed the Exhale Condensation Calculator confirmed that the conditions were present to induce the condensation of breath, otherwise known as fall in Oregon, USA.
Happy fall to the Northern hemisphere and happy spring to our Southern half!