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Monthly climate in Smiths Falls, Canada

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Smiths Falls features a humid continental climate (Dfb). Temperatures typically range between -8 °C (19 °F) and 22 °C (71 °F) through the year, but rarely can drop to -30 °C (-22 °F) or can rise to as high as 34 °C (93 °F). The average annual precipitation amounts to about 1088 mm (42.8 inches) and receives 146 rainy days on the 1 mm (0.04 inches) threshold annually. Smiths Falls enjoys an average of 2734 hours of sunshine throughout the year, and daylight varies from 8 hours 49 minutes to 15 hours 31 minutes per day.

Monthly average temperatures in Smiths Falls, Canada

The warmest months in Smiths Falls are June, July and August, with daily mean temperatures ranging from 18 to 22 °C (64 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -8 to -4 °C (19 - 25 °F) throughout the day. On average each year, Smiths Falls experiences 51 days above 25 °C (77.0 °F) and 134 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Smiths Falls. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum11°C
(52°F)		13°C
(55°F)		20°C
(69°F)		27°C
(81°F)		31°C
(89°F)		31°C
(88°F)		34°C
(93°F)		32°C
(90°F)		32°C
(89°F)		26°C
(80°F)		21°C
(70°F)		15°C
(59°F)
Mean maximum6°C
(43°F)		8°C
(47°F)		13°C
(56°F)		20°C
(69°F)		28°C
(83°F)		30°C
(86°F)		31°C
(89°F)		30°C
(87°F)		28°C
(83°F)		24°C
(75°F)		15°C
(59°F)		10°C
(50°F)
Average high-4°C
(26°F)		-2°C
(29°F)		3°C
(38°F)		10°C
(51°F)		18°C
(64°F)		23°C
(74°F)		27°C
(80°F)		26°C
(78°F)		22°C
(71°F)		14°C
(58°F)		5°C
(42°F)		-1°C
(31°F)
Daily mean-8°C
(19°F)		-6°C
(21°F)		-2°C
(29°F)		6°C
(43°F)		13°C
(55°F)		18°C
(64°F)		22°C
(71°F)		20°C
(69°F)		16°C
(62°F)		10°C
(50°F)		2°C
(35°F)		-4°C
(25°F)
Average low-12°C
(11°F)		-11°C
(12°F)		-6°C
(22°F)		2°C
(35°F)		7°C
(46°F)		12°C
(55°F)		16°C
(62°F)		16°C
(61°F)		12°C
(53°F)		6°C
(43°F)		-2°C
(28°F)		-7°C
(19°F)
Mean minimum-25°C
(-13°F)		-24°C
(-11°F)		-19°C
(-2°F)		-5°C
(23°F)		-0°C
(32°F)		6°C
(44°F)		11°C
(52°F)		10°C
(49°F)		5°C
(41°F)		-1°C
(30°F)		-13°C
(9°F)		-20°C
(-4°F)
Minimum-30°C
(-22°F)		-27°C
(-16°F)		-21°C
(-6°F)		-11°C
(13°F)		-3°C
(28°F)		2°C
(36°F)		9°C
(49°F)		7°C
(46°F)		1°C
(34°F)		-4°C
(25°F)		-17°C
(1°F)		-29°C
(-20°F)

Compare climate in Smiths Falls with other places

Compare temperature, precipitation, sunshine, UV index in Smiths Falls, Canada with other places around the world.

Monthly average precipitation in Smiths Falls, Canada

Smiths Falls usually has the most precipitation in April, July and October, with an average of 13 rainy days and 120 mm (4.7 inches) of precipitation per month. The driest months in Smiths Falls are January, February and September. On average, 68 mm (2.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Smiths Falls. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)73 (2.9)74 (2.9)77 (3.0)116 (4.6)103 (4.1)87 (3.4)113 (4.4)91 (3.6)57 (2.2)130 (5.1)91 (3.6)77 (3.0)
Average precipitation days (≥ 1 mm)91311131313131410131311

Monthly sunshine hours in Smiths Falls, Canada

The sunniest months in Smiths Falls are June, July and August, when the sun shines an average of 10 hours 42 minutes a day. Least sunny months in Smiths Falls: January, November and December receive an average of 4 hours 9 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Smiths Falls. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours111155233227280317347320272196147124
Mean daily daylight hours9h 12m10h 25m11h 57m13h 31m14h 51m15h 31m15h 9m13h 58m12h 27m10h 54m9h 32m8h 49m

Solar UV radiation in Smiths Falls, Canada

Smiths Falls experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 9 - 9, which corresponds to the Very High category of sun exposure. January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Smiths Falls UV Index data.

Average daily maximum UV levels by month for Smiths Falls. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)245899987532