3-year trends to April 2018

Hot and sunny

3-year trends to April 2018

April raw anomaly data (orange)

Raw temperature anomaly values for April 2018 were very high for daily maxima, daily minima and subsoil. Rather low moisture was shown by the rainfall and daily temperature range anomalies, while cloudiness was very low (sunny days), but dew point was near normal.

 Fully smoothed data (red)

In the latest fully-smoothed data, for October 2017, while rainfall anomaly continued to move up its graph towards dryness, the other three moisture anomalies (cloudy days, dew point, and daily temperature range) had just begun to move down towards wetness.
For temperatures, both daily maximum anomaly and daily minimum anomaly were rising rapidly. Subsoil temperature anomaly continued the rapid fall from its peak value (normal) in June 2017.


Fully smoothed data – Gaussian smoothing with half-width 6 months – are plotted in red, partly smoothed data uncoloured, and raw data for the last data point in orange. January data points are marked by squares.
Blue diamonds and the dashed blue rectangle show the extreme values in the fully smoothed data record since September 1999.

Normal values are based on averages for the decade from March 1999.* They appear on these graphs as a turquoise (turquoise) circle at the origin (0,0). A range of anomalies called “normal” is shown by a dashed rectangle in aqua (aqua). For values in degrees, the assigned normal range is +/-0.7°; for cloudiness, +/-7%; for monthly rainfall, +/-14 mm.

 * Normal values for rainfall are based on averages for the 125 years beginning 1883.

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