3-year trends to March 2017

Parametric plots of smoothed climate variables at Manilla
“Very rainy and cloudy”

3-year trends to March 2017

March raw anomaly data (orange)

March 2017 was dramatically cooler and more moist than the extremely hot and dry February. March days were cooler than normal and both rainfall and cloud were very high. Dew point and daily temperature range moved to the moist side of normal.

 Fully smoothed data (red)

The most recent fully-smoothed data is for September 2016. Following a winter that was cool and moist, September days remained cool but the climate became drier.
The smoothed anomaly of daily minimum temperature, which had hit a record high value in May 2016, approached normal. Subsoil temperature fell rapidly to below normal.


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.