Philadelphia picks up around 18 more inches of snow each winter.
San Mateo has around 74 fewer freezing nights a year. Philadelphia endures about 29 more days above 90 °F each year.
The year at a glance
Averages from 30 years of climate history, 1991-2020
| Philadelphia | Metric | San Mateo |
|---|---|---|
| 203 days | Sunny daysclear or partly cloudy skies | 234 days |
| 43 in | Precipitationper year | 21 in |
| 120 days | Wet daysrain or snow per year | 56 days |
| 18 in | Snowfallper year | 0 in |
| 36 days | Hot daysabove 90 °F | 8 days |
| 76 days | Freezing nightsat or below 32 °F | 2 days |
| 68% | Humidityaverage relative | 77% |
| 57 °F | Average temperatureyear round | 59 °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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Philadelphia high | 41 | 44 | 53 | 65 | 75 | 84 | 89 | 86 | 80 | 67 | 56 | 46 |
| San Mateo high | 58 | 61 | 64 | 66 | 69 | 73 | 74 | 75 | 76 | 73 | 64 | 58 |
| Philadelphia low | 27 | 29 | 35 | 45 | 55 | 65 | 70 | 68 | 61 | 50 | 40 | 32 |
| San Mateo low | 44 | 45 | 46 | 48 | 51 | 53 | 55 | 56 | 55 | 52 | 47 | 44 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| San Mateo | 3.9 | 4.2 | 3.2 | 1.6 | 0.8 | 0.2 | 0.0 | 0.0 | 0.1 | 0.9 | 2.0 | 3.7 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Philadelphia | 16 | 16 | 16 | 15 | 16 | 16 | 18 | 19 | 18 | 19 | 17 | 16 |
| San Mateo | 13 | 13 | 15 | 18 | 20 | 23 | 26 | 25 | 26 | 23 | 18 | 15 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
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
San Mateo vs another city
- San Mateo vs Hillsborough, CA
- San Mateo vs Foster City, CA
- San Mateo vs Belmont, CA
- San Mateo vs Burlingame, CA
- San Mateo vs San Carlos, CA
- San Mateo vs Millbrae, CA
- San Mateo vs New York, NY
- San Mateo vs Los Angeles, CA
- San Mateo vs Chicago, IL
- San Mateo vs Houston, TX
- San Mateo vs Phoenix, AZ
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).