Climate averages 1991–2020
Allen weather
in January.
A cool, moderately wet month: the coolest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cool month in Allen: daytime highs average 12.5°C and nights cool to about 3.2°C. By daytime temperature it is the coolest month of the year.
Expect about 70 mm of rain on roughly 7 days, which makes January a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 14 min on an average January day.
The nearest other city in this atlas is Plano (10 km away). In January its highs average 12.5°C, about as warm as Allen, with 70 mm of rain.
Among the 498 cities listed in the United States, Allen ranks joint 218th of 498 for the warmest January highs and joint 219th of 498 for the driest January (rainfall, lowest first). The mean January high of those 498 cities is 9.5°C; Allen is 3.0°C warmer than that mean.
From January to February, average highs rise by 2.4°C to 14.8°C, and monthly rainfall rises from 70 mm to 73 mm.
The annual picture
January 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
Allen climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 12.5°C3.2°C | 3.2°C | 70 | 6.8 | 10.210 h |
| February | 14.8°C5.2°C | 5.2°C | 73 | 7.5 | 11.011 h |
| March | 19.0°C9.1°C | 9.1°C | 100 | 9.2 | 12.012 h |
| April | 23.3°C13.3°C | 13.3°C | 110 | 8.4 | 13.013 h |
| May | 27.2°C18.2°C | 18.2°C | 138 | 11.1 | 13.814 h |
| June | 31.3°C22.6°C | 22.6°C | 86 | 8.4 | 14.314 h |
| July | 33.8°C24.9°C | 24.9°C | 46 | 5.9 | 14.114 h |
| August | 33.9°C24.9°C | 24.9°C | 53 | 5.3 | 13.413 h |
| September | 30.0°C21.0°C | 21.0°C | 71 | 6.2 | 12.412 h |
| October | 24.5°C15.1°C | 15.1°C | 99 | 7.8 | 11.411 h |
| November | 18.0°C9.1°C | 9.1°C | 93 | 7.0 | 10.510 h |
| December | 13.3°C4.5°C | 4.5°C | 91 | 7.1 | 10.010 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
January in nearby cities
- Plano in JanuaryUnited States · 10 kmHigh 12.5°C · Low 3.3°C · 70 mm rain
- McKinney in JanuaryUnited States · 12 kmHigh 12.2°C · Low 3.0°C · 70 mm rain
- Frisco in JanuaryUnited States · 15 kmHigh 12.3°C · Low 3.0°C · 67 mm rain
- Richardson in JanuaryUnited States · 18 kmHigh 12.7°C · Low 3.4°C · 70 mm rain
- Garland in JanuaryUnited States · 21 kmHigh 12.7°C · Low 3.4°C · 70 mm rain
- Carrollton in JanuaryUnited States · 26 kmHigh 12.8°C · Low 3.5°C · 68 mm rain
- Lewisville in JanuaryUnited States · 31 kmHigh 12.9°C · Low 3.5°C · 68 mm rain
- Dallas in JanuaryUnited States · 38 kmHigh 13.2°C · Low 3.8°C · 71 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 Allen) is explained once on the Allen year overview and on the Sources, method and limits page.
Plano, Garland and Richardson lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.