WeatherWX.com
Rosslyn Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 42°F Lo 29°F | Hi 46°F Lo 31°F | Hi 55°F Lo 38°F | Hi 66°F Lo 47°F | Hi 75°F Lo 57°F | Hi 84°F Lo 65°F | Hi 89°F Lo 71°F | Hi 87°F Lo 69°F | Hi 80°F Lo 63°F | Hi 69°F Lo 52°F | Hi 56°F Lo 41°F | Hi 47°F Lo 34°F |
| 8 mph | 8 mph | 8 mph | 8 mph | 6 mph | 6 mph | 5 mph | 5 mph | 6 mph | 7 mph | 7 mph | 7 mph |
| 3 in | 3.2 in | 3.6 in | 4.1 in | 4.2 in | 4.6 in | 5.1 in | 4.7 in | 4.5 in | 4.5 in | 3 in | 4.2 in |
| 71% | 72% | 70% | 69% | 74% | 71% | 69% | 70% | 71% | 72% | 70% | 73% |
| 43% | 44% | 44% | 42% | 44% | 35% | 34% | 35% | 36% | 38% | 34% | 43% |
| 30.1 in | 30.1 in | 30.1 in | 30.0 in | 30.0 in | 29.9 in | 30.0 in | 30.0 in | 30.0 in | 30.0 in | 30.1 in | 30.1 in |
| 22 | 18 | 23 | 23 | 22 | 20 | 20 | 21 | 23 | 25 | 25 | 23 |
| 7 | 8 | 6 | 7 | 9 | 10 | 11 | 10 | 8 | 6 | 5 | 7 |
| 2 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2 | 2 | 3 | 4 | 6 | 6 | 6 | 6 | 5 | 3 | 2 | 2 |
| 177 | 154 | 172 | 182 | 185 | 218 | 228 | 216 | 208 | 211 | 217 | 185 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 6°C Lo -2°C | Hi 8°C Lo -1°C | Hi 13°C Lo 3°C | Hi 19°C Lo 8°C | Hi 24°C Lo 14°C | Hi 29°C Lo 18°C | Hi 32°C Lo 22°C | Hi 31°C Lo 21°C | Hi 27°C Lo 17°C | Hi 20°C Lo 11°C | Hi 13°C Lo 5°C | Hi 9°C Lo 1°C |
| 12 km/h | 12 km/h | 13 km/h | 12 km/h | 10 km/h | 9 km/h | 8 km/h | 8 km/h | 9 km/h | 11 km/h | 11 km/h | 11 km/h |
| 76 mm | 81 mm | 92 mm | 104 mm | 107 mm | 117 mm | 130 mm | 120 mm | 115 mm | 113 mm | 75 mm | 107 mm |
| 71% | 72% | 70% | 69% | 74% | 71% | 69% | 70% | 71% | 72% | 70% | 73% |
| 43% | 44% | 44% | 42% | 44% | 35% | 34% | 35% | 36% | 38% | 34% | 43% |
| 1019 mb | 1019 mb | 1019 mb | 1016 mb | 1017 mb | 1014 mb | 1015 mb | 1015 mb | 1017 mb | 1017 mb | 1021 mb | 1020 mb |
| 22 | 18 | 23 | 23 | 22 | 20 | 20 | 21 | 23 | 25 | 25 | 23 |
| 7 | 8 | 6 | 7 | 9 | 10 | 11 | 10 | 8 | 6 | 5 | 7 |
| 2 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2 | 2 | 3 | 4 | 6 | 6 | 6 | 6 | 5 | 3 | 2 | 2 |
| 177 | 154 | 172 | 182 | 185 | 218 | 228 | 216 | 208 | 211 | 217 | 185 |
| Month |
| Avg. Temperatures |
| Avg. Wind Speed |
| Avg. Precipitation |
| Average Humidity |
| Avg. Cloud Cover |
| Pressure Average |
| Average Dry Days |
| Avg. Precip. Days |
| Avg. Snow Days |
| Average Fog Days |
| Average UV Index |
| Avg. Hours of Sun |
Averages are based on historical weather data from the past 10 years.