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SunnyDays

ERA5 almanac comparison — 8 years of real data

Carmel-by-the-Sea vs Mexico City: weather in December

Mexico City is the clear winner for sun in December: 50% of days historically clear versus just 1% in Carmel-by-the-Sea — a 49-point gap across 8 years of ERA5 data. Carmel-by-the-Sea also sees measurably more rain than Mexico City this month (37% vs 6% of days). This isn't close.

What you are reading: 8-year historical averages, not a forecast. Either destination can still surprise you this specific December. For the actual forecast right now, each destination links to its live page below.

Carmel-by-the-Sea

CA

Clear days, December
1%
Sample size
n=248 days
Avg high
58°F
Early December (1st–15th)
2%
Late December (16th–end)
0%
Rain frequency
37% of days
See the live forecast →

Mexico City

Mexico

Clear days, December
50%
Sample size
n=248 days
Avg high
72°F
Early December (1st–15th)
60%
Late December (16th–end)
40%
Rain frequency
6% of days

Frequently asked

Is Carmel-by-the-Sea or Mexico City warmer in December?

Mexico City runs warmer by day in December. Carmel-by-the-Sea averages highs of 58°F (highs n=248 days); Mexico City averages highs of 72°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.

Does it rain more in Carmel-by-the-Sea or Mexico City in December?

Carmel-by-the-Sea is measurably wetter than Mexico City. Days with measurable rain: Carmel-by-the-Sea 37%, Mexico City 6% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.

Which is sunnier in December, Carmel-by-the-Sea or Mexico City?

Mexico City is the clear winner for sun in December: 50% of days historically clear versus just 1% in Carmel-by-the-Sea — a 49-point gap across 8 years of ERA5 data. Carmel-by-the-Sea also sees measurably more rain than Mexico City this month (37% vs 6% of days). This isn't close.

Compare Carmel-by-the-Sea vs Mexico City in another month

All percentages are historical averages from the ERA5 reanalysis via Open-Meteo, 8 full years (2018–2025). “Clear” means avg high ≥ 72 °F, precipitation < 1 mm, and a non-precipitation weather code. This is history, not a forecast. The live forecast for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.