Portland and West Haven-Sylvan have remarkably similar climates.
The year at a glance
Averages from 30 years of climate history, 1991-2020
| Portland | Metric | West Haven-Sylvan |
|---|---|---|
| 160 days | Sunny daysclear or partly cloudy skies | 160 days |
| 37 in | Precipitationper year | 48 in |
| 157 days | Wet daysrain or snow per year | 143 days |
| 6 in | Snowfallper year | 6 in |
| 13 days | Hot daysabove 90 °F | 14 days |
| 22 days | Freezing nightsat or below 32 °F | 19 days |
| 76% | Humidityaverage relative | 75% |
| 55 °F | Average temperatureyear round | 55 °F |
Monthly temperatures
Average daily high and low for each month, in °F. The gap between the two lines is what an ordinary day feels like across the year.
Daily highs
Daily lows
View monthly temperatures as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Portland high | 47 | 51 | 56 | 61 | 68 | 73 | 81 | 81 | 75 | 63 | 53 | 46 |
| West Haven-Sylvan high | 48 | 53 | 57 | 62 | 69 | 74 | 81 | 82 | 76 | 64 | 53 | 47 |
| Portland low | 37 | 38 | 40 | 44 | 49 | 53 | 58 | 58 | 55 | 47 | 41 | 37 |
| West Haven-Sylvan low | 38 | 38 | 40 | 43 | 49 | 53 | 56 | 57 | 53 | 46 | 41 | 37 |
Monthly precipitation
Total rain plus melted snow for each month, in inches. Taller bars mean wetter months.
View monthly precipitation as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Portland | 5.1 | 4.0 | 4.4 | 3.5 | 2.1 | 1.3 | 0.4 | 0.4 | 1.3 | 3.2 | 5.3 | 5.9 |
| West Haven-Sylvan | 6.6 | 5.1 | 5.7 | 4.5 | 2.8 | 1.7 | 0.5 | 0.6 | 1.6 | 4.2 | 6.9 | 7.6 |
Monthly sunny days
Days each month with clear or partly cloudy skies, so compare the same month between cities.
View monthly sunny days as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Portland | 7 | 8 | 8 | 9 | 13 | 15 | 24 | 25 | 21 | 15 | 8 | 7 |
| West Haven-Sylvan | 7 | 8 | 8 | 9 | 13 | 15 | 24 | 25 | 21 | 15 | 8 | 7 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
Portland vs another city
- Portland vs Raleigh Hills, OR
- Portland vs Milwaukie, OR
- Portland vs West Slope, OR
- Portland vs Cedar Mill, OR
- Portland vs Vancouver, WA
- Portland vs New York, NY
- Portland vs Los Angeles, CA
- Portland vs Chicago, IL
- Portland vs Houston, TX
- Portland vs Phoenix, AZ
- Portland vs Philadelphia, PA
West Haven-Sylvan vs another city
- West Haven-Sylvan vs West Slope, OR
- West Haven-Sylvan vs Cedar Mill, OR
- West Haven-Sylvan vs Cedar Hills, OR
- West Haven-Sylvan vs Raleigh Hills, OR
- West Haven-Sylvan vs Marlene Village, OR
- West Haven-Sylvan vs Beaverton, OR
- West Haven-Sylvan vs New York, NY
- West Haven-Sylvan vs Los Angeles, CA
- West Haven-Sylvan vs Chicago, IL
- West Haven-Sylvan vs Houston, TX
- West Haven-Sylvan vs Phoenix, AZ
- West Haven-Sylvan vs Philadelphia, PA
About this data
Every figure on this page is a 30 year average computed from daily climate history for 1991-2020, using each city's own coordinates. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.
Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).