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Homer, Alaska climate
Dsc Mediterranean-influenced subarctic
Homer has a seasonal cold-temperate climate (Mediterranean-influenced subarctic, Köppen Dsc). The hottest month is July with an average daily high near 17°C, while the coldest is January averaging around −7°C at night. Precipitation totals about 607 mm a year and is strongly seasonal — September alone averages 83 mm while May barely receives 20 mm. At latitude 60°N, day length swings from 5.7 hours in midwinter to 18.3 hours at midsummer.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Homer climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 0 | 2 | 3 | 8 | 12 | 15 | 17 | 17 | 14 | 8 | 3 | 1 |
| Avg temp (°C) | −4 | −2 | −1 | 4 | 8 | 11 | 13 | 13 | 10 | 5 | 0 | −2 |
| Avg low (°C) | −7 | −6 | −5 | 0 | 3 | 7 | 10 | 9 | 6 | 1 | −4 | −6 |
| Precipitation (mm) | 55 | 46 | 34 | 29 | 20 | 22 | 37 | 59 | 83 | 66 | 73 | 83 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 0 | 2 | 3 | 8 | 12 | 15 |
| Avg temp (°C) | −4 | −2 | −1 | 4 | 8 | 11 |
| Avg low (°C) | −7 | −6 | −5 | 0 | 3 | 7 |
| Precipitation (mm) | 55 | 46 | 34 | 29 | 20 | 22 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 17 | 17 | 14 | 8 | 3 | 1 |
| Avg temp (°C) | 13 | 13 | 10 | 5 | 0 | −2 |
| Avg low (°C) | 10 | 9 | 6 | 1 | −4 | −6 |
| Precipitation (mm) | 37 | 59 | 83 | 66 | 73 | 83 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 14 | 12 | 10 | 10 | 10 | 10 | 12 | 14 | 16 | 15 | 15 | 16 |
| Days with low ≤ 0°C (days) | 27 | 25 | 27 | 18 | 5 | — | — | — | 3 | 15 | 23 | 27 |
| Days with snowfall ≥ 2.5 cm (days) | 0.9 | 0.9 | 0.9 | 0.1 | — | — | — | — | — | 0.2 | 0.6 | 0.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 14 | 12 | 10 | 10 | 10 | 10 |
| Days with low ≤ 0°C (days) | 27 | 25 | 27 | 18 | 5 | — |
| Days with snowfall ≥ 2.5 cm (days) | 0.9 | 0.9 | 0.9 | 0.1 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 12 | 14 | 16 | 15 | 15 | 16 |
| Days with low ≤ 0°C (days) | — | — | 3 | 15 | 23 | 27 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | 0.2 | 0.6 | 0.9 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 76 | 71 | 73 | 74 | 73 | 75 | 72 | 74 | 73 | 75 | 80 |
| Relative humidity (%) | 92 | 90 | 87 | 85 | 84 | 83 | 85 | 85 | 86 | 87 | 90 | 91 |
| Wind speed (m/s) | 4.9 | 4.8 | 4.5 | 4.0 | 3.4 | 2.8 | 2.5 | 2.9 | 3.7 | 4.1 | 4.7 | 4.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 76 | 71 | 73 | 74 | 73 |
| Relative humidity (%) | 92 | 90 | 87 | 85 | 84 | 83 |
| Wind speed (m/s) | 4.9 | 4.8 | 4.5 | 4.0 | 3.4 | 2.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 72 | 74 | 73 | 75 | 80 |
| Relative humidity (%) | 85 | 85 | 86 | 87 | 90 | 91 |
| Wind speed (m/s) | 2.5 | 2.9 | 3.7 | 4.1 | 4.7 | 4.9 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Homer AP (NOAA GHCN station USW00025507), about 3 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.