North Korea has two good windows: Apr–Jun and Sep–Oct. They sit either side of the season the climate record rules out, which is why the shoulder months matter here.
Rainy Jun–Jul, typhoons Aug–Sep
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | -1.1 | 30 | 8% | Too cold |
| February | 2.3 | 36 | 9% | Too cold |
| March | 8.6 | 47 | 11% | Fair |
| April | 16.5 | 62 | 19% | Go |
| May | 23.0 | 73 | 25% | Go |
| June | 27.8 | 82 | 34% | Go |
| July | 29.1 | 84 | 54% | Fair |
| August | 28.3 | 83 | 46% | Fair |
| September | 24.4 | 76 | 27% | Go |
| October | 17.9 | 64 | 20% | Go |
| November | 9.2 | 49 | 21% | Fair |
| December | 1.1 | 34 | 13% | Too cold |
Verdict combines mean daytime high with rainy-day frequency. “Rainy days” is the share of days in the month with at least 1 mm of rain.
January is the driest month, with rain on 8% of days and daytime highs near -1.1°C (30°F). July is the wettest, at 54%. Temperature swings hard across the year — 30.2°C between July (29.1°C / 84°F) and January (-1.1°C / 30°F) — so packing for the wrong month is the main risk. The record rules out too cold in Dec–Feb.