Monthly averages Anchorage Longitude: -149.9, Latitude: 61.2181 Average weather Anchorage, AK - 99502. The months with the lowest atmospheric pressure are November and December (29.67"Hg). We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.