Jackson Hole weather by month
Jackson Hole runs from about -6°C in January to 18°C in July, with March the wettest month at 120 mm.
warmest month
July
18°C
coolest month
January
-6°C
wettest month
March
120 mm
worst air month
August
9 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | -6°C | 72 mm | 149 h | 6 |
| February | -5°C | 102 mm | 145 h | 6 |
| March | -3°C | 120 mm | 224 h | 7 |
| April | 1°C | 36 mm | 325 h | 6 |
| May | 3°C | 59 mm | 359 h | 6 |
| June | 14°C | 16 mm | 404 h | 6 |
| July | 18°C | 13 mm | 441 h | 6 |
| August | 17°C | 19 mm | 392 h | 9 |
| September | 12°C | 29 mm | 327 h | 7 |
| October | 8°C | 21 mm | 284 h | 3 |
| November | -2°C | 38 mm | 188 h | 5 |
| December | -4°C | 89 mm | 133 h | 4 |
About 3,371 hours of sun a year. Roughly 62 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-25. Full method, licences and the list of sources we rejected are on the methodology page.