In January an extended high pressure area is normally observed over:
Refer to figure.
Northern Hemisphere Pressure Systems
SUMMER AND WINTER
| Azores High | Subtropical High, 30ºN in winter, 35ºN in Summer |
| Icelandic Low | Deepest in winter and situated over Iceland and Greenland |
| Siberian High | Winter high pressure zone which affects Asia and Europe |
| USA High | Winter high pressure zone which affects USA and Canada |
| Mediterranean | Frontal depressions in Winter |
| Siberian Low | Weak summer low pressure |
| USA Low | Summer low pressure |
| Mediterranean | Anticyclonic and hot in summer |
The North Atlantic region is affected predominantly by:
1) The subtropical high pressure belt. In summer it is situated in the Azores, SE USA and SW Europe, while in the winter it is situated in the Azores, S Europe and N Africa).
2) The Icelandic low - a widespread low pressure system extending from Iceland to southern Greenland, covering large parts of the North Atlantic. The Icelandic low is situated most of the year over Iceland and S Greenland, but it will extend further west to NE Canada in summertime and be weaker.
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