|Hydrological Outlook from October 2015|
Following a dry September, the probability that UK precipitation for October-November-December will fall into the driest of five equal categories is 15% and the probability that it will fall into the wettest of five equal categories is 35%.
Across the chalk aquifer, levels in September were below normal in central southern England and in much of eastern England, and normal elsewhere.
Levels in other aquifers were mixed, mostly normal to below except for above normal levels in parts of the Permo-Triassic sandstone and Carboniferous limestone.
Groundwater levels are expected to be normal to below normal over the next month, but with above normal levels occurring in parts of the southern Chalk, mainly in response to the August rainfall. Over the next three months, normal levels predominate, but the outlook is much more uncertain as this is the period where winter recharge typically starts; entering the recharge season with broadly normal groundwater levels, the outlook is highly sensitive to late autumn rainfall.
For further information see the full Hydrological Outlook for October.