| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 6.9° | -2.8° | 79.6mm | 9.3 | 32 |
| February | 8.8° | -1.8° | 68.7mm | 8.4 | 42 |
| March | 13.7° | 2.1° | 90.2mm | 9.6 | 61 |
| April | 19.9° | 7.4° | 87.5mm | 11.3 | 77 |
| May | 24.8° | 13.2° | 116.1mm | 12.6 | 75 |
| June | 29.6° | 18.5° | 121.2mm | 11 | 68 |
| July | 32.1° | 21.1° | 117.6mm | 10.6 | 58 |
| August | 31.4° | 20.2° | 99.8mm | 9.9 | 63 |
| September | 27.6° | 16° | 105.8mm | 9.4 | 79 |
| October | 21.2° | 9.3° | 98.5mm | 9.1 | 82 |
| November | 14.8° | 3.3° | 75.8mm | 8 | 67 |
| December | 9.4° | -0.3° | 94.5mm | 9 | 45 |
January in Downtown DC averages a daily high of 6.9°C with nights around -2.8°C. Expect roughly 9.3 wet days totalling 79.6mm. A hard month to visit for comfort alone.
February in Downtown DC averages a daily high of 8.8°C with nights around -1.8°C. Expect roughly 8.4 wet days totalling 68.7mm. Demanding conditions — pack for it and plan indoor options.
March in Downtown DC averages a daily high of 13.7°C with nights around 2.1°C. Expect roughly 9.6 wet days totalling 90.2mm. Generally workable, with some weather to plan around.
April in Downtown DC averages a daily high of 19.9°C with nights around 7.4°C. Expect roughly 11.3 wet days totalling 87.5mm. Comfortable conditions for being outdoors all day.
May in Downtown DC averages a daily high of 24.8°C with nights around 13.2°C. Expect roughly 12.6 wet days totalling 116.1mm. Comfortable conditions for being outdoors all day.
June in Downtown DC averages a daily high of 29.6°C with nights around 18.5°C. Expect roughly 11 wet days totalling 121.2mm. Generally workable, with some weather to plan around.
July in Downtown DC averages a daily high of 32.1°C with nights around 21.1°C. Expect roughly 10.6 wet days totalling 117.6mm. Generally workable, with some weather to plan around.
August in Downtown DC averages a daily high of 31.4°C with nights around 20.2°C. Expect roughly 9.9 wet days totalling 99.8mm. Generally workable, with some weather to plan around.
September in Downtown DC averages a daily high of 27.6°C with nights around 16°C. Expect roughly 9.4 wet days totalling 105.8mm. Comfortable conditions for being outdoors all day.
October in Downtown DC averages a daily high of 21.2°C with nights around 9.3°C. Expect roughly 9.1 wet days totalling 98.5mm. Comfortable conditions for being outdoors all day.
November in Downtown DC averages a daily high of 14.8°C with nights around 3.3°C. Expect roughly 8 wet days totalling 75.8mm. Generally workable, with some weather to plan around.
December in Downtown DC averages a daily high of 9.4°C with nights around -0.3°C. Expect roughly 9 wet days totalling 94.5mm. Demanding conditions — pack for it and plan indoor options.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Downtown DC peaks at 82.
Based on 30 years of records, April–May scores highest for comfort in Downtown DC, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 32.1°C.
June is the wettest, averaging 121.2mm of rain across roughly 11 wet days.
January is the coolest month, with average daily highs around 6.9°C.