WEATHER · CLIMATE NORMALS · 1991–2020
Anchorage Climate — Averages by Month
What the weather in Anchorage, USaverages across a standard 30-year period. Each month's figure is the 1991–2020 mean temperature and total rainfall from the ERA5 reanalysis — the long-run normal a place settles around, not a forecast for any particular day.
Month-by-month normals
| Month | Avg temperature | Avg rainfall |
|---|---|---|
| January | -8.1 °C · coldest | 58.0 mm |
| February | -5.8 °C | 56.6 mm |
| March | -3.7 °C | 44.4 mm |
| April | 2.1 °C | 35.6 mm |
| May | 7.3 °C | 36.5 mm |
| June | 12.1 °C | 46.7 mm |
| July | 14.5 °C · warmest | 81.2 mm |
| August | 13.8 °C | 112.5 mm |
| September | 9.8 °C | 123.1 mm · wettest |
| October | 2.9 °C | 97.0 mm |
| November | -3.8 °C | 71.9 mm |
| December | -6.7 °C | 82.7 mm |
How to read these numbers
These are reanalysis normals, not readings from a single weather station. They come from the ERA5 0.25° (~25 km) global reanalysis grid, sampled at the grid cell nearest Anchorage — centred at 61.25°N, 150.00°W. A reanalysis blends observations with a physics model onto an even grid, so a coastal or mountain city's cell can read a little cooler, warmer, wetter or drier than the city centre itself. The month-to-month shape — when it's hot, when it rains — is what these normals capture best.
“Normal” means the 1991–2020 average, the current World Meteorological Organization standard period. A normal is what a place tends toward over decades — any single day, month or year can and will depart from it.