Depends on if day or night
Daytime
Extremely Hot=95°F+ (Heat Index)
Very Hot=92°F to 94°F (Heat Index)
Hot=86°F to 91°F (Heat Index)
Very Warm=79°F to 85°F (Heat Index)
Warm=70°F to 78°F (Heat Index)
Mild=59°F to 69°F
Cool=47°F to 58°F
Chilly=32°F to 46°F (Wind Chill)
Cold=16°F to 31°F (Wind Chill)
Very Cold= -2 to 15°F (Wind Chill)
Extremely Cold= -3 or colder (Wind Chill)
Night
Extremely Hot=101°F+ (Heat Index)
Very Hot=97°F to 100°F (Heat Index)
Hot=92° to 96°F (Heat Index)
Very Warm=85°F to 91°F (Heat Index)
Warm=76°F to 84°F (Heat Index)
Mild=65°F to 75°F
Cool=52°F to 64°F
Chilly=38°F to 51°F (Wind Chill)
Cold=22°F to 37°F (Wind Chill)
Very Cold=4°F to 21°F (Wind Chill)
Extremely Cold=3°F or colder (Wind Chill)
I have a scale to evaluate a day as a whole as well
Means
Extremely Hot=86°F+
Very Hot=82.5°F to 85.5°F
Hot=77°F to 82°F
Very Warm=70°F to 76.5°F
Warm=61°F to 69.5°F
Mild=50°F to 60.5°F
Cool=37.5°F to 49.5°F
Chilly=23°F to 37°F
Cold=7°F to 22.5°F
Very Cold= -11°F to 6.5°F
Extremely Cold= -11.5°F or colder
So for us (using means)
Feb 20th to Mar 26th=Warm
Mar 27th to Apr 27th=Very Warm
Apr 28th to May 15th=Hot
May 16th to May 25th=Very Hot
May 26th to Sept 25th=Extremely Hot
Sept 26th to Oct 4th=Very Hot
Oct 5th to Oct 17th=Hot
Oct 18th to Nov 6th=Very Warm
Nov 7th to Nov 29th=Warm
Nov 30th to Feb 19th=Mild