Climate Chart of Ottawa, Canada

Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023

Climate overview

Temperature

January has the lowest monthly mean temperature, -8.7 °C, while July has the highest, 21.6 °C. These are averages for each month, not daytime maximum temperatures, so they do not show the range or timing of conditions within a day. The unweighted mean of the monthly means is 7.1 °C; it summarizes the calendar-month figures without weighting them by the number of days in each month.

Rain

Mean daily rainfall reaches its monthly high in June at 3.70 mm/day, and its low in January at 0.87 mm/day. These are average daily amounts, not monthly totals, and they do not indicate how often rain falls or whether a particular day will be wet. Across the monthly means, the unweighted average is 2.34 mm/day per day, a summary rather than a day-weighted annual figure.

Snow

The highest monthly mean daily snowfall is recorded in February, at 12.98 mm/day. The unweighted mean of the monthly snowfall figures is 4.17 mm/day per day. These amounts do not establish how many days have snowfall, how deep snow becomes, or whether snow cover persists, so they cannot by themselves indicate conditions for snow-based activities.

Sunshine

Mean daily sunshine duration is highest in July at 11.80 hours/day and lowest in December at 3.67 hours/day. These monthly averages describe sunshine duration, not daylight length, and do not promise clear skies on a given day. The unweighted mean across the monthly figures is 7.70 hours/day per day, useful as a broad reference rather than a measure of conditions on individual dates.

Best Travel Time Guide for Ottawa, Canada: Ideal Seasons and Weather Insights

If lower average rainfall is your priority, January is the conditional option in these figures, with mean daily rainfall of 0.87 mm/day. That average does not guarantee dry days or show rain frequency; pack for changeable conditions rather than treating it as a promise. For planning around rain, note that the highest monthly mean daily rainfall occurs in June at 3.70 mm/day. For visitors prioritising cooler monthly-average temperatures, January is the relevant reference, with a mean of -8.7 °C; this is not a daytime maximum and cannot predict the weather on travel dates. Outdoor planners seeking the greatest average daily sunshine can look to July, at 11.80 hours/day, while December has the lowest mean daily sunshine at 3.67 hours/day. Sunshine duration is not day length, and neither average guarantees the conditions of a particular day.

The snowfall figures record a mean daily amount of 12.98 mm/day in February. This can inform cold-weather packing, but it does not reveal the number of snowy days, snow depth or persistent cover, so use it only as a broad seasonal reference rather than a guide to specific outdoor conditions.

Climate Data Overview for Ottawa, Canada

Explore the comprehensive climate data for Ottawa, Canada. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.

• See also climate change in Ottawa
• Explore the climate in Canada