Discover the best time of year, based on historical climate, temperature, and precipitation.
The best weather in Herndon is from May, June, October. — consistent weather climate
🌦Humid
| Score | 15 | 22 | 48 | 75 | 78 | 77 | 39 | 63 | 74 | 84 | 55 | 20 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Climate | Cold | Cold | Cold | Cool & rainy | Humid | Humid | Hot & rainy | Rainy | Humid | Mild | Cold | Cold |
| Temperature | -1–7°C | 0–10°C | 3–15°C | 7–19°C | 12–24°C | 18–30°C | 21–33°C | 20–30°C | 16–26°C | 10–21°C | 5–14°C | 0–9°C |
| Feels like | -5–3°C | -4–6°C | 0–12°C | 5–17°C | 11–24°C | 18–31°C | 23–35°C | 22–33°C | 16–27°C | 8–20°C | 1–12°C | -3–6°C |
| Precipitation | 90mm 9 days | 82mm 10 days | 86mm 9 days | 105mm 9 days | 93mm 11 days | 98mm 9 days | 137mm 9 days | 155mm 12 days | 126mm 11 days | 81mm 7 days | 70mm 5 days | 107mm 7 days |
| Sunshine | 5.6h ☀︎ 57% | 6.6h ☀︎ 61% | 7.9h ☀︎ 66% | 9.2h ☀︎ 70% | 9.3h ☀︎ 65% | 11.6h ☀︎ 78% | 11.8h ☀︎ 81% | 10.5h ☀︎ 77% | 9.0h ☀︎ 72% | 8.2h ☀︎ 74% | 7.9h ☀︎ 79% | 6.1h ☀︎ 65% |
| Wind | W · 18 km/h | W · 18 km/h | W · 19 km/h | W · 19 km/h | W · 16 km/h | SW · 16 km/h | SW · 14 km/h | SW · 14 km/h | N · 14 km/h | W · 15 km/h | W · 17 km/h | W · 17 km/h |
| Humidity (%) | 70% | 68% | 64% | 63% | 67% | 63% | 69% | 74% | 73% | 73% | 68% | 70% |
| Day length | 9.8h | 10.7h | 12.0h | 13.2h | 14.3h | 14.9h | 14.6h | 13.6h | 12.4h | 11.2h | 10.1h | 9.5h |