Trenton's proximity to Lake Ontario yields a moderate climate.

Average Summer temperature is 24C/75F.
Average Spring temperature is 12C/54F.
Average Fall temperature is 10C/50F.
Average Winter temperature is -8C/18F.

Trenton
Current Conditions

7+ Day Forcast     Pollen, UV Index Air Quality Wind Chill & Heat Pressure, Flu Activity     Fishing Forecast     Road Conditions     Marine Forecast     Live Radar

Temperature Flucuations

May long-weekend, water cool but usually can swim. Night frosts have ended. July, usually 2 weeks 30 C (86 F) or higher. August, usually 2 weeks cool 15 C (59 F) and wet. September, back-to-school week or week after hot & sunny 25 C (77 F). First Week October, usually 21 C (41 F). January Thaw, one week 5 C (41 F) Between December & February, usually get 2 to 3 weeks when temperatures are -18 C (0 F).

The Old Farmer's Almanac Long Range Weater Forecast for Trenton, Ontario - TAP HERE

Average Daily Temperatures
Month	Celsius	Fahrenheit
January	-9 to -6	16 to 21
February	-12 to -9	10 to 16
March	-5 to 5	23 to 41
April	5 to 10	41 to 50
May	14 to 20	57 to 68
June	19 to 25	66 to 77
July	23 to 29	73 to 84
August	17 to 25	63 to 77
September	15 to 21	59 to 70
October	6 to 13	43 to 55
November	-4 to 5	25 to 41
December	-6 to 0	21 to 32
Remember, you can always take excess clothes off if you're too hot but you can't put them on if you don't have them with you.