| 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 Cheongju-si 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 Cheongju-si 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 Cheongju-si 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 Cheongju-si 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 Cheongju-si 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 Cheongju-si 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 Cheongju-si 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 Cheongju-si 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 Cheongju-si averages a daily high of 26.5°C. Comfortable conditions for being outdoors all day.
October in Cheongju-si averages a daily high of 21°C. Comfortable conditions for being outdoors all day.
November in Cheongju-si averages a daily high of 13.5°C. Generally workable, with some weather to plan around.
December in Cheongju-si 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. Cheongju-si peaks at 94.
Based on 30 years of records, September–October scores highest for comfort in Cheongju-si, 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.