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 highest maximum temperature value in this time period. For more information of the source data and figures, click here.

 

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.

Mean temperature is the average temperature on a given day and is usually obtained by averaging the daily maximum and minimum temperatures. For more information of the source data and figures, click here.

This is the average minimum temperature for a given time period and is derived by averaging all the daily minimum temperatures in that time period. 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.

The number of days with minimum temperatures less than ‑15°C gives an indication of the number of very cold days in a given time period. For more information of the source data and figures, click here.

The number of days with minimum temperatures less than ‑25°C gives an indication of the number of extreme cold days in a given time period. For more information of the source data and figures, click here.

This is the number of days when daily maximum temperature is greater than 25°C and gives an indication of the number of summer days. For more information of the source data and figures, click here.

This is the number of days when daily maximum temperature is greater than 27°C. For more information of the source data and figures, click here.

This is the number of days when daily maximum temperature is greater than 29°C. For more information of the source data and figures, click here.

This is the number of days when daily maximum temperature is greater than 30°C and gives an indication of the number of very hot days. For more information of the source data and figures, click here.

This is the number of days when daily maximum temperature is greater than 32°C. 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.

This is the largest precipitation total on a single day. For more information of the source data and figures, click here.

Number of days with daily precipitation totals greater than 1 mm. For more information of the source data and figures, click here.

Number of days with daily precipitation totals greater than 10 mm. For more information of the source data and figures, click here.

Number of days with daily precipitation totals greater than 20 mm. For more information of the source data and figures, click here.

This is the average maximum temperature for a given time period and is derived by averaging all the daily maximum temperatures in that time period. For more information of the source data and figures, click here.

This is the lowest minimum temperature value in this time period. For more information of the source data and figures, click here.

This is the total precipitation (rain and snow) for a given time period. 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.

Intensity Duration Frequency (IDF) curves relate short-duration rainfall intensity with its frequency of occurrence and are often used for flood forecasting and urban drainage design.

Climate Normals 1981-2010 are used to summarize or describe the average climatic conditions of a particular location. At the completion of each decade, Environment and Climate Change Canada updates its climate normals for as many locations and as many climatic characteristics as possible. The climate normals offered here are based on Canadian climate stations with at least 15 years of data between 1981 to 2010.