Philadelphia endures about 22 more days above 90 °F each year.
Cos Cob picks up around 15 more inches of snow each winter. Philadelphia has around 30 fewer freezing nights a year.
The year at a glance
Averages from 30 years of climate history, 1991-2020
| Cos Cob | Metric | Philadelphia |
|---|---|---|
| 202 days | Sunny daysclear or partly cloudy skies | 203 days |
| 44 in | Precipitationper year | 43 in |
| 122 days | Wet daysrain or snow per year | 120 days |
| 33 in | Snowfallper year | 18 in |
| 14 days | Hot daysabove 90 °F | 36 days |
| 106 days | Freezing nightsat or below 32 °F | 76 days |
| 73% | Humidityaverage relative | 68% |
| 53 °F | Average temperatureyear round | 57 °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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cos Cob high | 38 | 41 | 49 | 61 | 71 | 79 | 84 | 82 | 75 | 64 | 53 | 43 |
| Philadelphia high | 41 | 44 | 53 | 65 | 75 | 84 | 89 | 86 | 80 | 67 | 56 | 46 |
| Cos Cob low | 22 | 24 | 31 | 40 | 50 | 59 | 65 | 63 | 56 | 45 | 36 | 28 |
| Philadelphia low | 27 | 29 | 35 | 45 | 55 | 65 | 70 | 68 | 61 | 50 | 40 | 32 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cos Cob | 3.3 | 3.1 | 4.1 | 3.6 | 3.4 | 3.7 | 3.6 | 4.1 | 3.7 | 4.0 | 3.2 | 4.1 |
| Philadelphia | 3.2 | 3.0 | 4.1 | 3.6 | 3.5 | 3.8 | 3.9 | 3.7 | 4.1 | 3.6 | 2.9 | 4.0 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cos Cob | 17 | 16 | 17 | 15 | 15 | 15 | 19 | 18 | 18 | 19 | 17 | 17 |
| Philadelphia | 16 | 16 | 16 | 15 | 16 | 16 | 18 | 19 | 18 | 19 | 17 | 16 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
Cos Cob vs another city
- Cos Cob vs Riverside, CT
- Cos Cob vs Greenwich, CT
- Cos Cob vs Old Greenwich, CT
- Cos Cob vs Stamford, CT
- Cos Cob vs Byram, CT
- Cos Cob vs Port Chester, NY
- Cos Cob vs New York, NY
- Cos Cob vs Los Angeles, CA
- Cos Cob vs Chicago, IL
- Cos Cob vs Houston, TX
- Cos Cob vs Phoenix, AZ
Philadelphia vs another city
- Philadelphia vs Elkins Park, PA
- Philadelphia vs Bala Cynwyd, PA
- Philadelphia vs Palmyra, NJ
- Philadelphia vs Camden, NJ
- Philadelphia vs Wyndmoor, PA
- Philadelphia vs Merion Station, PA
- Philadelphia vs New York, NY
- Philadelphia vs Los Angeles, CA
- Philadelphia vs Chicago, IL
- Philadelphia vs Houston, TX
- Philadelphia vs Phoenix, AZ
- Philadelphia vs San Antonio, TX
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).