A second 100% sunny day is to keep October 2013’s warmer than normal temp trend going


Gorgeous autumn weather continues!  Chicagoans will be able to take in 100% of the city’s possible sun for a second consecutive day Wednesday.


Though October 2013 to date has generated just 50% of its possible sun (57% is normal), the larger meteorological autumn season which began Sept. 1 has produced 61% of its possible sun. The normal allocation of sunshine for a full autumn season here comes in at 54%.


The month’s sunshine may be a bit sub-par, but its temperatures, save for a few cool nights of late, have delighted those who are in no hurry to see the chill of late autumn or winter gain a foothold just yet.



The Chicago area’s recent cool nights aside, October 2013 is off to its mildest start in 5 years and ranks among the warmest 13% of October opens in the city’s 142 year observational record.



Though recent nights have been cool, the area’s daytime temp recovery has been impressive.


Readings surged 32-degrees Tuesday from the 43-degree morning low to the day’s high of 75-degrees—a reading more typical of mid-September than early October.




The 43-degree morning low was this area’s coolest temp in the more than 4 months since June 2 and 3—the two days which last generated a 43-degree minimum.




Northern lights sighted for the second time in as many weeks Tuesday evening; sightings were reported from the Midwest into Canada, New England and the UK



Northern lights were reported Tuesday night from Scotland in the UK across the Atlantic into New England and westward into Quebec, Canada the Midwest.



By late evening Tuesday, auroral displays were visible as close as Janesville, WI.



Also overnight, the Draconid Meteor Shower took place.




Tuesday dawned “frosty” in the north and northwest suburbs



That WAS frost you saw in the NW suburbs Tuesday morning. Little wonder! Some north and northwest suburban temps dipped as low as 35-degrees at Gurnee & 38 at Barrington & McHenry.



Official thermometers and temperature sensors are mounted, by international agreement (in order to standardize global temp readings), at six feet above the ground.




It’s entirely possible for a shallow layer of freezing or sub-freezing air, within which frost can develop, to occur below instrument level, and therefore, to occur undetected by the thermometer above.