When it comes to the best time of year to wash a home’s windows in the Upper Midwest, there seem to be (at least) two schools of thought:
School #1: Spring-Summer is best (the most popular view).
That’s because that’s when there is the most daylight ” over 15 1/2 hours locally on June 21 ” and sparkling clean windows are most noticeable.
Which of course leads to the exact opposite argument . . .
School #2: late Fall/Winter is best.
You’ll appreciate clean windows the most precisely when natural light is in scarcest supply (personally, I’m in that camp).
Which leaves alternative #3, also popular with ever-pragmatic Minnesotans: clean your home’s windows . . . when they’re dirty. 🙂
P.S.: the Kaplan household strategy?
I pay a professional to do the upper level, outside windows.
Then, I conscript able-bodied family members to do the rest.
See also, “The Easiest Way to Lighten a Home in Minnesota (at least 6 months a year, anyway)“; “Winter Humor: Minnesota vs. Miami (& Elsewhere)“; “Daylight Savings Trick“; and “$1,000 for Windows. CLEANING Windows”; and “Window Washing . . in Winter!“