All Variables

Below is a library of all variables available within ClimateData.ca. Use the filter to limit your search to specific types of data.

This is the number days when daily minimum temperature is less than 0°C and indicates when conditions are below freezing, usually overnight. For more information of the source data and figures, click here.

Cooling degree days give an indication of the amount of air conditioning that may be required to maintain comfortable conditions in a building during warmer months. A threshold temperature of 18°C is used and for any day when the mean temperature exceeds this value, cooling degree days are accrued. So, if the daily mean temperature on a given day is 24°C, then 6 CDDs are accrued for this day. CDD values are totalled over the year; the larger the CDD value the greater the requirement for air conditioning.

For more information of the source data and figures, click here.

Growing degree days are a measure of whether climate conditions are warm enough to support plant growth. When the daily mean temperature exceeds the threshold temperature, growing degree days are accrued. A threshold temperature of 10°C is generally used for crops such as corn and beans that require warmer temperatures to reach maturity. For more information of the source data and figures, click here.

Growing degree days are a measure of whether climate conditions are warm enough to support plant growth. When the daily mean temperature exceeds the threshold temperature, growing degree days are accrued. A threshold temperature of 5°C is generally used for forage crops and canola. For more information of the source data and figures, click here.

Cumulative degree-days above 0°C are calculated by adding average daily temperature over a defined time period (e.g. a year or month) for those days when the mean temperature exceeds 0°C. This index can be used as an indicator for plant and insect growth.  The warmer the weather, the more quickly these species develop, and the cooler the temperature, the slower they develop. For more information of the source data and figures, click here.

Heating degree days give an indication of the amount of space heating that may be required to maintain comfortable conditions in a building during cooler months. A threshold temperature of 17°C is used and for any day when the mean temperature is below this value, heating degree days are accrued. So, if the daily mean temperature on a given day is 10°C, then 7 HDDs are accrued for this day. HDD values are totalled over the year; the larger the HDD value the greater the requirement for space heating. For more information of the source data and figures, click here.

This is the number of days when the daily maximum temperature does not exceed 0°C. For more information of the source data and figures, click here.

The number of tropical nights refers to the number of days when the minimum temperature (which usually refers to night-time temperature) value does not go below 18°C. For more information of the source data and figures, click here.

The number of tropical nights refers to the number of days when the minimum temperature (which usually refers to night-time temperature) value does not go below 20°C. For more information of the source data and figures, click here.

The number of tropical nights refers to the number of days when the minimum temperature (which usually refers to night-time temperature) value does not go below 22°C. For more information of the source data and figures, click here.