Thunder Bay vs Duluth: which is sunnier?
🇨🇦 Canada vs 🇺🇸 United States · 275 km apart · long-term climate normals (NASA POWER, 2001–2020)
Duluth is the sunnier overall: about 2,261 hours of sunshine a year to Thunder Bay's 1,985. Duluth has the higher Sunshine Score in 2 of 12 months, Thunder Bay in 1 (9 within 2 points).
Scores are the 0–100 Sunshine Score — sunshine, daytime warmth and dryness in one number, per month.
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At a glance
| Thunder Bay | Duluth | |
|---|---|---|
| Sunshine hours / year | 1,985 | 2,261 |
| Sunniest month | August (79/100) | September (77/100) |
| Nov–Feb average score | 0/100 | 0/100 |
| Jun–Aug average score | 77/100 | 75/100 |
| Rain / year | 632 mm | 733 mm |
| Peak midday UV | 6 (high) | 7 (high) |
Thunder Bay vs Duluth month by month
| Month | Sunshine Score | Day high °C | Rain mm | |||
|---|---|---|---|---|---|---|
| Thunder Bay | Duluth | Thunder Bay | Duluth | Thunder Bay | Duluth | |
| January | 0 | 0 | -8° | -9° | 26 | 19 |
| February | 0 | 0 | -7° | -7° | 20 | 23 |
| March | 0 | 0 | 1° | 1° | 30 | 37 |
| April | 7 | 7 | 9° | 9° | 55 | 64 |
| May | 51 | 57 | 16° | 17° | 72 | 86 |
| June | 74 | 73 | 21° | 22° | 86 | 104 |
| July | 77 | 76 | 25° | 26° | 75 | 90 |
| August | 79 | 76 | 24° | 25° | 59 | 87 |
| September | 71 | 77 | 19° | 20° | 70 | 80 |
| October | 13 | 13 | 10° | 10° | 66 | 73 |
| November | 0 | 0 | 3° | 2° | 40 | 35 |
| December | 0 | 0 | -5° | -6° | 33 | 35 |
The sunnier month by month: Jan even · Feb even · Mar even · Apr even · May Duluth · Jun even · Jul even · Aug Thunder Bay · Sep Duluth · Oct even · Nov even · Dec even.
When to pick which
- November–February: too close to call — Thunder Bay averages 0/100, Duluth 0/100. Daytime highs are similar (-4°C vs -5°C). See the winter sun ranking.
- March–May: too close to call — Thunder Bay averages 19/100, Duluth 21/100. Daytime highs are similar (9°C vs 9°C).
- June–August: too close to call — Thunder Bay averages 77/100, Duluth 75/100. Daytime highs are similar (23°C vs 24°C).
- September–October: Duluth (average score 45/100 vs 42). Daytime highs are similar (15°C vs 15°C).
Full month-by-month guides: Thunder Bay weather by month · Duluth weather by month · Best time to visit Canada · Best time to visit United States.
More comparisons: Thunder Bay vs Green Bay · Thunder Bay vs Sioux Lookout · Duluth vs Minneapolis · Duluth vs Fargo · Duluth vs Rochester · all head-to-heads