Why there is no recommendation here
No month at Haleakalā clears every critical climate criterion. Rather than publish a weak score, we withhold the recommendation entirely.
United States · Hawaii
No recommendation: Haleakalā
Selected representative ERA5-Land grid cell at about 1,472 m; not a claim about every route across the region.
Plan with real conditions
Compare the hiking year
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| Month | Hiking-hour temperature | Wet days per month | Days with modelled snow | Daylight | Season guide |
|---|---|---|---|---|---|
| January | 16.7°C | ≈ 19.6 | 0% | 11 h 00 min | No recommendation |
| February | 16.0°C | ≈ 20.7 | 0% | 11 h 30 min | No recommendation |
| March | 16.0°C | ≈ 24.9 | 0% | 12 h 00 min | No recommendation |
| April | 16.5°C | ≈ 26.6 | 0% | 12 h 36 min | No recommendation |
| May | 17.6°C | ≈ 27 | 0% | 13 h 06 min | No recommendation |
| June | 18.3°C | ≈ 28 | 0% | 13 h 24 min | No recommendation |
| July | 19.0°C | ≈ 29.9 | 0% | 13 h 12 min | No recommendation |
| August | 19.4°C | ≈ 29.3 | 0% | 12 h 48 min | No recommendation |
| September | 19.2°C | ≈ 26.8 | 0% | 12 h 12 min | No recommendation |
| October | 19.0°C | ≈ 26.4 | 0% | 11 h 42 min | No recommendation |
| November | 17.9°C | ≈ 26 | 0% | 11 h 12 min | No recommendation |
| December | 16.9°C | ≈ 24.6 | 0% | 10 h 54 min | No recommendation |
What these numbers describe
Historical climate at one selected model cell. Higher routes, sheltered valleys and exposed ridges can differ substantially.
Model elevation: 1,472 m · Historical period: 1991–2025
Trail wind is not available here. This model does not resolve exposed ridges or gusts; check a local mountain forecast.
How to read these figures
Selected cell: 20.7, -156.2
Temperature sampling window (local time, limited to daylight): 08:00–18:00.
A wet day has at least 1 mm of total precipitation (including snow water equivalent). It may rain for only part of the day.
A snow day meets either model threshold: 10% snow cover or 2 cm snow depth.
Turn the climate into a trip
Choose a specific route and check its distance, ascent, difficulty, current access and forecast. These are not supplied by the climate model.
Provenance
Selected representative cell
This detail page remains available for data review and provenance. Because no month passes the recommendation gate, it makes no hiking-score or best-month claims.
20.7, -156.2 · 1,472 m
representative1,421–1,522 m100% weight
Months we do not recommend
12 months do not clear the gate
The record for these months is complete. They carry no hiking score because at least one critical component is at or below 20, and we would rather say so here than publish a weak recommendation.
- January16.7°C63% wet dayswithheld
- February16.0°C73% wet dayswithheld
- March16.0°C80% wet dayswithheld
- April16.5°C89% wet dayswithheld
- May17.6°C87% wet dayswithheld
- June18.3°C93% wet dayswithheld
- July19.0°C96% wet dayswithheld
- August19.4°C95% wet dayswithheld
- September19.2°C89% wet dayswithheld
- October19.0°C85% wet dayswithheld
- November17.9°C87% wet dayswithheld
- December16.9°C79% wet dayswithheld
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More around Haleakalā
Hiking areas
What the data still shows
The record itself is complete: 306,864 hourly values from 1991 to 2025 at 20.70, -156.20, at a model elevation of 1,471.6 metres. Mean monthly temperature runs from 16 to 19 degrees, and the wettest month is July at 96 percent rain days. This page stays available so the decision to withhold can be checked.
What these figures cover
Every figure comes from one selected ERA5-Land model grid cell at 20.70, -156.20, 1,471.6 metres, averaged over 1991 to 2025. It describes that point rather than every route in the region, and it is not a forecast. Wind is coarse 10 metre grid wind, not a statement about exposed paths or gusts.
Quick answers
Questions about Haleakalā
- When should you hike Haleakalā?
- We recommend no month for Haleakalā. No month clears every critical climate criterion in the model.
- What do these figures describe?
- One selected ERA5-Land model grid cell at 1471.6 metres, averaged over 1991 to 2025. It is not a forecast and not a statement about individual trails.