Each zipped data block is selected by clicking on the table below. The individual grids are named according to the following convention:
where yyyy is the year and 'Actual' indicates a grid of actual values (rather than, say, anomalies).
Please note that since the last update of these files, the method used to calculate the annual variables has changed. Previously, each annual variable was calculated for individual stations (from daily station temperature/rainfall values), and then the station values were interpolated onto a 5 km grid. This can be summarised as a ‘calculate then grid’ approach.
The new method is to start with the daily temperature/rainfall grids (themselves calculated from daily station temperature/rainfall values) and calculate the annual variables for each grid point from the series of daily values for that same grid point. This can be summarised as a ‘grid then calculate’ approach.
For consistency, the new method has been used to recalculate the entire series of grids, as well as to produce the most recent years. The old method grids are still available (on request through our customer centre) but will no longer be kept up to date. This means that the most recent years’ grids are only available from the new method.
We have taken this approach for a number of reasons. Firstly, it ensures consistency between our daily and annual grids. Secondly, it allows fair comparison between the variables we provide and new variables which users may create from our daily grids. For example, a user might create an alternative definition of growing season length, and calculate this from our daily grids. Using the old method, it would be unclear whether differences (between the user definition and our own) were a robust sign of different data characteristics, or merely a result of different interpolation methods.
|Climate variable||Last modified||Download|
|Heating degree days||28 June 2013||HeatingDegreeDays_196-2011 (ZIP, 1.60 MB)|
|Cooling degree days||28 June 2013||CoolingDegreeDays_1960-2011 (ZIP, 831 KB)|
|Growing degree days||28 June 2013||GrowingDegreeDays_1960-2011 (ZIP, 1.57 MB)|
|Extreme temperature range||28 June 2013||ExtremeTempRange_1960-2011 (ZIP, 789 KB)|
|Growing season length (days)||28 June 2013||GrowingSeasonLength_1960-2011 (ZIP, 464 KB)|
|Summer (May-Oct) heatwave duration (days)||28 June 2013||SummerHeatWave_1960-2011 (ZIP, 314 KB)|
|Winter (Nov-Apr) heatwave duration (days)||28 June 2013||WinterHeatWave_1961-2011 (ZIP, 337 KB)|
|Summer (May-Oct) coldwave duration (days)||28 June 2013||SummerColdWave_1960-2011 (ZIP, 205 KB)|
|Winter (Nov-Apr) coldwave duration (days)||28 June 2013||WinterColdWave_1961-2011 (ZIP, 308 KB)|
|Maximum number of consecutive dry days||28 June 2013||ConsecutiveDryDays_1961-2011 (ZIP, 1.14 MB)|
|Greatest 5-day precipitation total (mm)||28 June 2013||Rainfall5Day_1961-2011 (ZIP, 1.48 MB)|
|Rainfall intensity on days of rain ≥1 mm (mm/day)||28 June 2013||RainfallIntensity_1961-2011 (ZIP, 1.06 MB)|
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