MD
Great Falls and Potomac have remarkably similar climates.
The year at a glance
Averages from 30 years of climate history, 1991-2020
| Great Falls | Metric | Potomac |
|---|---|---|
| 205 days | Sunny daysclear or partly cloudy skies | 205 days |
| 43 in | Precipitationper year | 43 in |
| 119 days | Wet daysrain or snow per year | 119 days |
| 21 in | Snowfallper year | 17 in |
| 24 days | Hot daysabove 90 °F | 29 days |
| 105 days | Freezing nightsat or below 32 °F | 91 days |
| 68% | Humidityaverage relative | 68% |
| 55 °F | Average temperatureyear round | 56 °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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Great Falls high | 42 | 46 | 54 | 66 | 73 | 82 | 86 | 85 | 78 | 67 | 56 | 46 |
| Potomac high | 42 | 46 | 54 | 66 | 74 | 82 | 87 | 85 | 78 | 67 | 56 | 46 |
| Great Falls low | 24 | 26 | 33 | 42 | 53 | 62 | 67 | 65 | 58 | 45 | 35 | 29 |
| Potomac low | 26 | 27 | 34 | 44 | 54 | 63 | 68 | 66 | 59 | 47 | 37 | 30 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Great Falls | 3.1 | 2.9 | 3.9 | 3.4 | 3.9 | 3.6 | 4.1 | 3.6 | 4.5 | 3.5 | 3.0 | 3.5 |
| Potomac | 3.1 | 2.9 | 3.9 | 3.4 | 3.9 | 3.6 | 4.1 | 3.6 | 4.5 | 3.5 | 3.0 | 3.5 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Great Falls | 16 | 15 | 16 | 16 | 16 | 17 | 19 | 19 | 18 | 20 | 18 | 16 |
| Potomac | 16 | 15 | 16 | 16 | 16 | 17 | 19 | 19 | 18 | 20 | 18 | 16 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
Great Falls vs another city
- Great Falls vs Sugarland Run, VA
- Great Falls vs Lowes Island, VA
- Great Falls vs Dranesville, VA
- Great Falls vs Travilah, MD
- Great Falls vs Reston, VA
- Great Falls vs Cascades, VA
- Great Falls vs New York, NY
- Great Falls vs Los Angeles, CA
- Great Falls vs Chicago, IL
- Great Falls vs Houston, TX
- Great Falls vs Phoenix, AZ
- Great Falls vs Philadelphia, PA
Potomac vs another city
- Potomac vs North Bethesda, MD
- Potomac vs Bethesda, MD
- Potomac vs Travilah, MD
- Potomac vs McLean, VA
- Potomac vs Rockville, MD
- Potomac vs New York, NY
- Potomac vs Los Angeles, CA
- Potomac vs Chicago, IL
- Potomac vs Houston, TX
- Potomac vs Phoenix, AZ
- Potomac 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).