Greenland has no ideal window. No month clears the bar for comfortable travel outright, but Jun–Aug comes closest — rated fair rather than too hot, too cold or too wet.
Polar; brief summer
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | -6.2 | 21 | 48% | Too cold |
| February | -7.2 | 19 | 51% | Too cold |
| March | -5.9 | 21 | 42% | Too cold |
| April | -1.9 | 29 | 38% | Too cold |
| May | 1.8 | 35 | 37% | Too cold |
| June | 5.2 | 41 | 37% | Fair |
| July | 7.7 | 46 | 34% | Fair |
| August | 7.3 | 45 | 44% | Fair |
| September | 4.5 | 40 | 47% | Too cold |
| October | 0.8 | 33 | 41% | Too cold |
| November | -2.5 | 28 | 47% | Too cold |
| December | -4.4 | 24 | 50% | 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.
July is the driest month, with rain on 34% of days and daytime highs near 7.7°C (46°F). February is the wettest, at 51%. The warmest month is July at 7.7°C (46°F); the coolest is February at -7.2°C (19°F). The record rules out too cold in Sep–May.