| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 3.9° | — | 3.2mm | 4 | 40 |
| February | 7.2° | — | 7.9mm | 3 | 53 |
| March | 12.7° | — | 59mm | 7 | 63 |
| April | 19.3° | — | 99.2mm | 7 | 84 |
| May | 24.8° | — | 168.9mm | 12 | 76 |
| June | 27.9° | — | 235.3mm | 7 | 82 |
| July | 29.5° | — | 475.6mm | 20 | 60 |
| August | 30.2° | — | 427.4mm | 16.3 | 57 |
| September | 26.5° | — | — | — | 94 |
| October | 21° | — | — | — | 94 |
| November | 13.5° | — | — | — | 73 |
| December | 5.9° | — | — | — | 49 |
January in Daejeon averages a daily high of 3.9°C. Expect roughly 4 wet days totalling 3.2mm. Demanding conditions — pack for it and plan indoor options.
February in Daejeon averages a daily high of 7.2°C. Expect roughly 3 wet days totalling 7.9mm. Demanding conditions — pack for it and plan indoor options.
March in Daejeon averages a daily high of 12.7°C. Expect roughly 7 wet days totalling 59mm. Generally workable, with some weather to plan around.
April in Daejeon averages a daily high of 19.3°C. Expect roughly 7 wet days totalling 99.2mm. Comfortable conditions for being outdoors all day.
May in Daejeon averages a daily high of 24.8°C. Expect roughly 12 wet days totalling 168.9mm. Comfortable conditions for being outdoors all day.
June in Daejeon averages a daily high of 27.9°C. Expect roughly 7 wet days totalling 235.3mm. Comfortable conditions for being outdoors all day.
July in Daejeon averages a daily high of 29.5°C. Expect roughly 20 wet days totalling 475.6mm. Generally workable, with some weather to plan around.
August in Daejeon averages a daily high of 30.2°C. Expect roughly 16.3 wet days totalling 427.4mm. Generally workable, with some weather to plan around.
September in Daejeon averages a daily high of 26.5°C. Comfortable conditions for being outdoors all day.
October in Daejeon averages a daily high of 21°C. Comfortable conditions for being outdoors all day.
November in Daejeon averages a daily high of 13.5°C. Generally workable, with some weather to plan around.
December in Daejeon averages a daily high of 5.9°C. 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. Daejeon peaks at 94.
Based on 30 years of records, September–October scores highest for comfort in Daejeon, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 30.2°C.
July is the wettest, averaging 475.6mm of rain across roughly 20 wet days.
January is the coolest month, with average daily highs around 3.9°C.