Weather and climate in Tecumseh, Ontario, Canada: monthly averages and best time for stargazing

Best for stargazingSep, Oct, NovMost clear, dark hours

Warmest monthJulyAverage high 28°C

Coolest monthJanuaryAverage low -8°C

Wettest monthMay97 mm on average

What the weather is like in Tecumseh

The warmest month in Tecumseh is July, with average highs of 28°C. The coolest is January, when nights average -8°C. About 848 mm of rain and snow falls in a typical year, most in May and least in February.

Skies are clearest in September (49% average cloud cover) and cloudiest in December (79%). Combining cloud with the length of truly dark nights, September, October, November offer the most clear, dark hours for stargazing.

Clear, dark hours per night

2.6 Jan

2.9 Feb

2.9 Mar

2.6 Apr

1.9 May

1.9 Jun

2.4 Jul

3.3 Aug

4.2 Sep

3.6 Oct

3.5 Nov

2.4 Dec

Hours of full astronomical darkness in mid-month, multiplied by the average share of clear sky. A rough guide to how much good observing time a typical night offers.

Monthly averages

Month	High	Low	Precipitation	Cloud cover	Humidity	Wind	Dark hours
January	-1°C	-8°C	52 mm	77%	87%	15 km/h	11.2 h
February	0°C	-8°C	52 mm	72%	85%	15 km/h	10.2 h
March	6°C	-4°C	56 mm	68%	79%	14 km/h	8.9 h
April	13°C	2°C	77 mm	64%	75%	14 km/h	7.2 h
May	20°C	8°C	97 mm	64%	76%	11 km/h	5.4 h
June	25°C	14°C	84 mm	56%	76%	10 km/h	4.3 h
July	28°C	17°C	85 mm	50%	74%	9 km/h	4.9 h
August	27°C	17°C	82 mm	49%	73%	9 km/h	6.6 h
September	23°C	13°C	74 mm	49%	75%	10 km/h	8.3 h
October	16°C	6°C	72 mm	63%	78%	12 km/h	9.8 h
November	8°C	0°C	62 mm	69%	82%	14 km/h	11.0 h
December	2°C	-5°C	55 mm	79%	86%	14 km/h	11.5 h

Climate averages: NASA POWER, 2001–2025, for the grid area around 42.50, -83.13 (about 50 km across). High and low temperatures are estimated from the monthly mean and the average daily range. Hills, coasts and cities can differ from the area average. Aurora outlook for Tecumseh · Sources and methods.