| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 6.2° | -3.2° | 80.6mm | 10 | 28 |
| February | 8.1° | -2.3° | 74.6mm | 9.5 | 36 |
| March | 12.9° | 1.6° | 91mm | 10.4 | 56 |
| April | 19.1° | 6.7° | 89.2mm | 10.9 | 75 |
| May | 23.9° | 12.1° | 99.2mm | 12.3 | 75 |
| June | 28.9° | 17.3° | 103.6mm | 11.3 | 70 |
| July | 31.4° | 20.1° | 118.1mm | 10.6 | 61 |
| August | 30.2° | 19.2° | 110mm | 10 | 67 |
| September | 26.4° | 15.3° | 113.3mm | 9.2 | 82 |
| October | 20.2° | 8.5° | 100.6mm | 8.5 | 83 |
| November | 13.9° | 2.6° | 78.5mm | 8.3 | 64 |
| December | 8.6° | -1° | 94.8mm | 10.3 | 38 |
January in Ellicott City averages a daily high of 6.2°C with nights around -3.2°C. Expect roughly 10 wet days totalling 80.6mm. A hard month to visit for comfort alone.
February in Ellicott City averages a daily high of 8.1°C with nights around -2.3°C. Expect roughly 9.5 wet days totalling 74.6mm. Demanding conditions — pack for it and plan indoor options.
March in Ellicott City averages a daily high of 12.9°C with nights around 1.6°C. Expect roughly 10.4 wet days totalling 91mm. Generally workable, with some weather to plan around.
April in Ellicott City averages a daily high of 19.1°C with nights around 6.7°C. Expect roughly 10.9 wet days totalling 89.2mm. Comfortable conditions for being outdoors all day.
May in Ellicott City averages a daily high of 23.9°C with nights around 12.1°C. Expect roughly 12.3 wet days totalling 99.2mm. Comfortable conditions for being outdoors all day.
June in Ellicott City averages a daily high of 28.9°C with nights around 17.3°C. Expect roughly 11.3 wet days totalling 103.6mm. Generally workable, with some weather to plan around.
July in Ellicott City averages a daily high of 31.4°C with nights around 20.1°C. Expect roughly 10.6 wet days totalling 118.1mm. Generally workable, with some weather to plan around.
August in Ellicott City averages a daily high of 30.2°C with nights around 19.2°C. Expect roughly 10 wet days totalling 110mm. Generally workable, with some weather to plan around.
September in Ellicott City averages a daily high of 26.4°C with nights around 15.3°C. Expect roughly 9.2 wet days totalling 113.3mm. Comfortable conditions for being outdoors all day.
October in Ellicott City averages a daily high of 20.2°C with nights around 8.5°C. Expect roughly 8.5 wet days totalling 100.6mm. Comfortable conditions for being outdoors all day.
November in Ellicott City averages a daily high of 13.9°C with nights around 2.6°C. Expect roughly 8.3 wet days totalling 78.5mm. Generally workable, with some weather to plan around.
December in Ellicott City averages a daily high of 8.6°C with nights around -1°C. Expect roughly 10.3 wet days totalling 94.8mm. 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. Ellicott City peaks at 83.
Based on 30 years of records, April–May scores highest for comfort in Ellicott City, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 31.4°C.
July is the wettest, averaging 118.1mm of rain across roughly 10.6 wet days.
January is the coolest month, with average daily highs around 6.2°C.