Climate averages 1991–2020
McAllen weather
in December.
A warm, fairly dry month: the 11th warmest and the 3rd driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in McAllen: daytime highs average 22.5°C and nights cool to about 13.0°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 30 mm of rain on roughly 5 days, which makes December a fairly dry month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 32 min on an average December day.
The nearest other city in this atlas is Mission (10 km away). In December its highs average 22.5°C, about as warm as McAllen, with 30 mm of rain.
Among the 498 cities listed in the United States, McAllen ranks joint 21st of 498 for the warmest December highs and joint 47th of 498 for the driest December (rainfall, lowest first). The mean December high of those 498 cities is 10.5°C; McAllen is 11.9°C warmer than that mean.
From December to January, average highs fall by 0.7°C to 21.8°C, and monthly rainfall falls from 30 mm to 26 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
McAllen climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 21.8°C12.1°C | 12.1°C | 26 | 4.4 | 10.711 h |
| February | 24.4°C14.1°C | 14.1°C | 24 | 4.4 | 11.311 h |
| March | 27.2°C16.8°C | 16.8°C | 36 | 5.2 | 12.012 h |
| April | 30.5°C19.9°C | 19.9°C | 44 | 5.3 | 12.813 h |
| May | 33.0°C23.1°C | 23.1°C | 55 | 6.6 | 13.413 h |
| June | 34.9°C25.1°C | 25.1°C | 51 | 7.0 | 13.714 h |
| July | 35.6°C25.5°C | 25.5°C | 55 | 5.7 | 13.614 h |
| August | 35.9°C25.7°C | 25.7°C | 39 | 6.7 | 13.113 h |
| September | 32.5°C23.8°C | 23.8°C | 88 | 11.8 | 12.312 h |
| October | 30.1°C20.5°C | 20.5°C | 59 | 6.7 | 11.612 h |
| November | 25.7°C16.2°C | 16.2°C | 35 | 5.3 | 10.911 h |
| December, selected | 22.5°C13.0°C | 13.0°C | 30 | 5.1 | 10.511 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Mission in DecemberUnited States · 10 kmHigh 22.5°C · Low 12.9°C · 30 mm rain
- Edinburg in DecemberUnited States · 13 kmHigh 22.5°C · Low 13.0°C · 30 mm rain
- Reynosa in DecemberMexico · 15 kmHigh 22.7°C · Low 13.1°C · 30 mm rain
- Ciudad Río Bravo in DecemberMexico · 28 kmHigh 22.6°C · Low 13.4°C · 31 mm rain
- Heroica Matamoros in DecemberMexico · 81 kmHigh 22.0°C · Low 14.8°C · 34 mm rain
- Nuevo Laredo in DecemberMexico · 191 kmHigh 20.9°C · Low 11.0°C · 28 mm rain
- Corpus Christi in DecemberUnited States · 196 kmHigh 19.8°C · Low 11.7°C · 51 mm rain
- Ciudad Benito Juárez in DecemberMexico · 196 kmHigh 20.2°C · Low 10.2°C · 24 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for McAllen) is explained once on the McAllen year overview and on the Sources, method and limits page.
Edinburg and Mission lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.