Trend in the number of frost-free days
Figure
Created 22 Jun 2016
Published 19 Dec 2016
Last modified 09 Feb 2017
The annual rate of change of frost-free days represents the trend coefficient for long-term changes in the annual number of days with a minimum daily temperature above 0 °C. For example, a value of 1 indicates that the number of frost-free days has increased on average by 1 day per year in last 30 years (period 1985-2014). The analysis is based on the JRC-MARS gridded meteorological data at 25 km resolution.
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From the JRC-MARS gridded agro-meteorological database, meteorological observations of daily minimum air temperature at station level with data available for last 30 years (1985-2014) have been selected. Linear trend coefficients were calculated for all stations selected. Then the trend coefficients were spatially interpolated onto the regular 25 km JRC-MARS grid using the thin plate spline method.
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Days/year
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The resulting geotiff has one band representing the value of the calculated trend in days per year.
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For references, please go to https://www.eea.europa.eu/data-and-maps/figures/rate-of-change-of-frost-1 or scan the QR code.
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