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How Mestro normalize using degree days (heating and cooling):
- For properties with heat meters, zip code and country entered in Mestro Portal, degree days will automatically be retrieved from Degreedays. It is also possible to collect degree days from SMHI.
The normal year is always calculated in the same way (an hourly average of the years 2005 through 2012),
The base temperature for all properties in Mestro is 17 degrees celsius.
Mestro calculates a factor by dividing the degree days of the current year with the degree days of the normal year. The measured energy usage is then divided by this factor. Major variations in outdoor temperature will therefore be accounted for by this corrective factor. We apply SMHI's recommended rule for extreme months (max correction of 150% and minimum correction of 60%).
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Degree days is a metric of how local temperatures deviate from the normal year. You can choose to normalize heating and cooling data in Mestro Portal by toggling the Weather Normalize switch in report settings, under the section Calculations.
Mestro Portal can visualize the degree days for a specific location if you limit input data to a single property, or several properties located in the same geographic area. Simply select Weather Normalization in the usage report. We are unable to visualize degree days for groups of properties located in cities served by different weather stations, unfortunately.
However, this does not limit your application of degree days calculations in reports. An advantageous example is in the ranking report, where you can compare normalized changes between properties. By considering relative outdoor temperature, you can determine how well a property (or group) compares with others through time. See the example below on the data with weather normalization on and off.
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Note: Since degree days are calculated on a monthly basis, you cannot use the weather normalized heating or cooling in the Usage Analysis report if you want to look at hourly data.
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