Best Time-of-Year
The best month at Index is September, when temperatures average 10–19 °C (51–66 °F) and mid-day humidity sits around 63%. Expect mild days, with around 2 excellent days in a typical September. May, June, and September are the most reliable months, with milder temperatures.
- Terrible
- Poor
- Fair
- Good
- Excellent
- Perfect
Tap a month for its details below.
Month by Month
January
A typical January brings rainy, cold days, with around 4 excellent days. Cold takes out most of the rest.
February
A typical February brings rainy, cold days, with around 2 excellent days. Cold takes out most of the rest.
March
A typical March brings rainy, cool days, with around 4 climbable days. Cold takes out most of the rest.
April
A typical April brings rainy, cool days, with around 6 excellent days. Cold takes out most of the rest.
May
May is among the year's most reliable months — expect rainy, cool days, with around 2 excellent days.
June
June is among the year's most reliable months — expect rainy, mild days, with around 17 climbable days.
July
A typical July brings dry, mild days, with around 27 climbable days.
August
A typical August brings mild days, with around 23 climbable days.
September
September is the year's best month for climbing — expect mild days, with around 2 excellent days.
October
A typical October brings rainy, cool days, with around 2 excellent days.
November
A typical November brings rainy, cool days, with around 2 excellent days. Cold takes out most of the rest.
December
A typical December brings rainy, cold days, with around 2 climbable days. Cold takes out most of the rest.
A Typical Year
| Month | Excellent Days | Viable Days | Off Days | Temperature | Wet Days | Mid-Day Humidity |
|---|---|---|---|---|---|---|
| January | 4 | 4 | 23 | 0–4 °C 32–40 °F | 18 | 78% |
| February | 2 | 3 | 23 | 0–4 °C 31–40 °F | 17 | 78% |
| March | 1 | 4 | 26 | 1–7 °C 34–44 °F | 20 | 74% |
| April | 6 | 4 | 20 | 2–10 °C 36–49 °F | 17 | 68% |
| May | 2 | 13 | 16 | 6–14 °C 43–57 °F | 15 | 70% |
| June | 0 | 17 | 13 | 9–17 °C 48–63 °F | 12 | 67% |
| July | 0 | 27 | 4 | 12–22 °C 53–72 °F | 3 | 59% |
| August | 0 | 23 | 8 | 13–22 °C 55–72 °F | 7 | 61% |
| September | 2 | 16 | 12 | 10–19 °C 51–66 °F | 8 | 63% |
| October | 2 | 9 | 20 | 6–13 °C 43–55 °F | 15 | 71% |
| November | 2 | 3 | 25 | 2–7 °C 36–44 °F | 20 | 79% |
| December | 1 | 2 | 28 | 0–4 °C 32–39 °F | 22 | 85% |