Norway has no ideal window. No month clears the bar for comfortable travel outright, but Apr–Oct comes closest — rated fair rather than too hot, too cold or too wet.
Cold; brief mild summer
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | -3.4 | 26 | 43% | Too cold |
| February | -2.5 | 28 | 40% | Too cold |
| March | 1.7 | 35 | 35% | Too cold |
| April | 8.1 | 47 | 37% | Fair |
| May | 13.9 | 57 | 42% | Fair |
| June | 17.6 | 64 | 47% | Fair |
| July | 20.0 | 68 | 55% | Fair |
| August | 18.7 | 66 | 53% | Fair |
| September | 14.2 | 58 | 41% | Fair |
| October | 7.4 | 45 | 48% | Fair |
| November | 1.2 | 34 | 51% | Too cold |
| December | -2.8 | 27 | 44% | 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.
March is the driest month, with rain on 35% of days and daytime highs near 1.7°C (35°F). July is the wettest, at 55%. Temperature swings hard across the year — 23.4°C between July (20.0°C / 68°F) and January (-3.4°C / 26°F) — so packing for the wrong month is the main risk. The record rules out too cold in Nov–Mar.