The dashed contours shown on each map indicate where the mean of the ensemble forecast was different to the mean of the model climatology at the 90% significance level according to a students T-test. Although not the ideal test statistic it indicates where the model is more 'confident' that the forecast mean is different to climatology. There are no guarantees that a significant deviation will be realised.

Notes: New wind product:
We have decided to add a monthly wind anomaly forecast to our monthly maps. These are shown as 'U-wind anomalies' and 'V-wind anomalies':

U-wind refers to the East-to-West component of the wind. When this is positive it means the easterly (east to west) component of the wind is greater than normal for that season/month; when this is negative it means the westerly (west to east) component of the wind is greater than normal for that season/month.

V-wind refers to the South-to-North component of the wind. When this is positive it means the southerly (south to north) component of the wind is greater than normal for that season/month; when this is negative it means the northerly (north to south) component of the wind is greater than normal for that season/month.