| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -4.3° | -12.7° | 11.5mm | 2.5 | 25 |
| February | -0.4° | -9.7° | 9.3mm | 2.9 | 24 |
| March | 5.7° | -3.6° | 21.8mm | 4.4 | 37 |
| April | 12.5° | 3° | 43.5mm | 6.4 | 63 |
| May | 16.8° | 8.2° | 91.4mm | 12.2 | 65 |
| June | 19.8° | 13.1° | 100.2mm | 15.2 | 69 |
| July | 23.7° | 17.7° | 153.2mm | 15.1 | 70 |
| August | 25.5° | 18.9° | 162.1mm | 13.4 | 73 |
| September | 22.4° | 13.7° | 74.4mm | 7.7 | 85 |
| October | 15.7° | 6.2° | 49.3mm | 5.4 | 75 |
| November | 5.6° | -2.5° | 30.8mm | 5 | 37 |
| December | -2.6° | -10.1° | 12.2mm | 3.3 | 23 |
January in Ŭndŏk averages a daily high of -4.3°C with nights around -12.7°C. Rain is rare — about 2.5 wet days and 11.5mm across the month. A hard month to visit for comfort alone.
February in Ŭndŏk averages a daily high of -0.4°C with nights around -9.7°C. Rain is rare — about 2.9 wet days and 9.3mm across the month. A hard month to visit for comfort alone.
March in Ŭndŏk averages a daily high of 5.7°C with nights around -3.6°C. Expect roughly 4.4 wet days totalling 21.8mm. Demanding conditions — pack for it and plan indoor options.
April in Ŭndŏk averages a daily high of 12.5°C with nights around 3°C. Expect roughly 6.4 wet days totalling 43.5mm. Generally workable, with some weather to plan around.
May in Ŭndŏk averages a daily high of 16.8°C with nights around 8.2°C. Expect roughly 12.2 wet days totalling 91.4mm. Generally workable, with some weather to plan around.
June in Ŭndŏk averages a daily high of 19.8°C with nights around 13.1°C. Expect roughly 15.2 wet days totalling 100.2mm. Generally workable, with some weather to plan around.
July in Ŭndŏk averages a daily high of 23.7°C with nights around 17.7°C. Expect roughly 15.1 wet days totalling 153.2mm. Generally workable, with some weather to plan around.
August in Ŭndŏk averages a daily high of 25.5°C with nights around 18.9°C. Expect roughly 13.4 wet days totalling 162.1mm. Generally workable, with some weather to plan around.
September in Ŭndŏk averages a daily high of 22.4°C with nights around 13.7°C. Expect roughly 7.7 wet days totalling 74.4mm. Comfortable conditions for being outdoors all day.
October in Ŭndŏk averages a daily high of 15.7°C with nights around 6.2°C. Expect roughly 5.4 wet days totalling 49.3mm. Comfortable conditions for being outdoors all day.
November in Ŭndŏk averages a daily high of 5.6°C with nights around -2.5°C. Expect roughly 5 wet days totalling 30.8mm. Demanding conditions — pack for it and plan indoor options.
December in Ŭndŏk averages a daily high of -2.6°C with nights around -10.1°C. Expect roughly 3.3 wet days totalling 12.2mm. A hard month to visit for comfort alone.
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. Ŭndŏk peaks at 85.
Based on 30 years of records, September scores highest for comfort in Ŭndŏk, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 25.5°C.
August is the wettest, averaging 162.1mm of rain across roughly 13.4 wet days.
January is the coolest month, with average daily highs around -4.3°C.