Boise vs Idaho Falls: which is sunnier?
🇺🇸 United States vs 🇺🇸 United States · 335 km apart · long-term climate normals (NASA POWER, 2001–2020)
Boise and Idaho Falls are virtually tied for annual sunshine — about 2,989 vs 2,995 hours a year. Boise has the higher Sunshine Score in 7 of 12 months, Idaho Falls in 2 (3 within 2 points).
Scores are the 0–100 Sunshine Score — sunshine, daytime warmth and dryness in one number, per month.
At a glance
| Boise | Idaho Falls | |
|---|---|---|
| Sunshine hours / year | 2,989 | 2,995 |
| Sunniest month | September (94/100) | July (93/100) |
| Nov–Feb average score | 2/100 | 0/100 |
| Jun–Aug average score | 78/100 | 91/100 |
| Rain / year | 390 mm | 543 mm |
| Peak midday UV | 9 (very high) | 9 (very high) |
Boise vs Idaho Falls month by month
| Month | Sunshine Score | Day high °C | Rain mm | |||
|---|---|---|---|---|---|---|
| Boise | Idaho Falls | Boise | Idaho Falls | Boise | Idaho Falls | |
| January | 0 | 0 | 3° | -1° | 51 | 57 |
| February | 0 | 0 | 6° | 1° | 36 | 48 |
| March | 29 | 0 | 12° | 8° | 47 | 51 |
| April | 60 | 36 | 16° | 13° | 35 | 56 |
| May | 90 | 80 | 22° | 19° | 38 | 54 |
| June | 92 | 89 | 28° | 25° | 23 | 42 |
| July | 67 | 93 | 35° | 32° | 7 | 19 |
| August | 76 | 92 | 34° | 30° | 7 | 25 |
| September | 94 | 89 | 27° | 24° | 14 | 40 |
| October | 76 | 44 | 18° | 14° | 27 | 45 |
| November | 7 | 0 | 9° | 6° | 40 | 47 |
| December | 0 | 0 | 3° | 0° | 65 | 59 |
The sunnier month by month: Jan even · Feb even · Mar Boise · Apr Boise · May Boise · Jun Boise · Jul Idaho Falls · Aug Idaho Falls · Sep Boise · Oct Boise · Nov Boise · Dec even.
When to pick which
- November–February: too close to call — Boise averages 2/100, Idaho Falls 0/100. Boise is the warmer, around 5°C daytime highs vs 2°C. See the winter sun ranking.
- March–May: Boise (average score 60/100 vs 39). Boise is the warmer, around 17°C daytime highs vs 13°C.
- June–August: Idaho Falls (average score 91/100 vs 78). Boise is the warmer, around 32°C daytime highs vs 29°C.
- September–October: Boise (average score 85/100 vs 67). Boise is the warmer, around 23°C daytime highs vs 19°C.
Full month-by-month guides: Boise weather by month · Idaho Falls weather by month · Best time to visit United States.
More comparisons: Boise vs Pasco · Boise vs Redmond · Idaho Falls vs Salt Lake City · Idaho Falls vs Provo · Idaho Falls vs Bozeman · all head-to-heads