SeasonMapReykjavík vs San Juan: which is better, month by month
San Juan beats Reykjavík in 7 of 12 months — its lead peaks in January (77 vs 31) — while Reykjavík wins June to September; they are within 3 points in May.
Each place is scored under the lens that suits its type. Comfort is SeasonMap's 0–100 estimate from ERA5 climate normals, not a forecast.
Reykjavík vs San Juan — all 12 months
| Month | Reykjavík | San Juan | Winner | Gap |
|---|---|---|---|---|
| January | 31Ffreezing, rainy, clean air | 77Bhot, a little rain, clean air | San Juan | 46 |
| February | 40Ffreezing, rainy, clean air | 75Bhot, a little rain, clean air | San Juan | 35 |
| March | 50Dcold, rainy, clean air | 77Bhot, a little rain, clean air | San Juan | 27 |
| April | 64Ccold, rainy, clean air | 72Bhot, rainy, clean air | San Juan | 8 |
| May | 72Bcold, rainy, clean air | 70Bsweltering, rainy, clean air | Tie | 2 |
| June | 78Bcool, rainy, clean air | 70Bsweltering, a little rain, clean air | Reykjavík | 8 |
| July | 85Acool, a little rain, clean air | 66Csweltering, rainy, clean air | Reykjavík | 19 |
| August | 81Acool, rainy, clean air | 64Csweltering, rainy, clean air | Reykjavík | 17 |
| September | 68Ccold, rainy, clean air | 61Csweltering, rainy, clean air | Reykjavík | 7 |
| October | 56Dcold, rainy, clean air | 63Csweltering, rainy, clean air | San Juan | 7 |
| November | 43Fcold, rainy, clean air | 64Csweltering, soaked, clean air | San Juan | 21 |
| December | 33Ffreezing, rainy, clean air | 73Bhot, a little rain, clean air | San Juan | 40 |
A month is a tie when the two are within 3 points. The widest gap is January (31 vs 77). Tap a month for that month's temperature, rain, humidity and air quality side by side.