December weather forecast
McKinney, TX

Weather in December

The first month of the winter, December, is also a fresh month in McKinney, Texas, with temperature in the range of an average low of 40.3°F (4.6°C) and an average high of 54.5°F (12.5°C).

Temperature

In McKinney, the average high-temperature in December drops from a comfortable 63.5°F (17.5°C) in November to a cool 54.5°F (12.5°C). The average low-temperature, in McKinney, is 40.3°F (4.6°C).

Humidity

In December, the average relative humidity in McKinney, Texas, is 71%.

Rainfall

In McKinney, it is raining for 9.4 days, with typically 2.17" (55mm) of accumulated precipitation. Throughout the year, in McKinney, Texas, there are 144.7 rainfall days, and 33.54" (852mm) of precipitation is accumulated.

Snowfall

Months with snowfall in McKinney are January, February, November and December. In McKinney, Texas, during 0.3 snowfall days, 0.08" (2mm) of snow is typically accumulated. In McKinney, Texas, during the entire year, snow falls for 3.1 days and aggregates up to 1.1" (28mm) of snow.

Daylight

The month with the shortest days in McKinney, Texas, is December, with an average of 10h and 0min of daylight.
On the first day of the month, sunrise is at 7:11 am and sunset at 5:19 pm. On the last day of December, sunrise is at 7:29 am and sunset at 5:29 pm CST.

Sunshine

The month with the least sunshine in McKinney is December, with an average of 5.6h of sunshine.

UV index

The months with the lowest UV index in McKinney are January, November and December, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in December in McKinney?

The average high-temperature, in December, in McKinney, is 54.5°F (12.5°C), while the average low-temperature is 40.3°F (4.6°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in September is calculated to be 95°F (35°C).

What is the average humidity in December in McKinney?

In McKinney, the average relative humidity in December is 71%.

How many days does it rain in December in McKinney?

In McKinney, in December, during 9.4 rainfall days, 2.17" (55mm) of precipitation is typically accumulated.

How much does it snow in McKinney in December?

In McKinney, in December, snow falls for 0.3 days, with typically accumulated 0.08" (2mm) of snow.

What is the month with the shortest days in McKinney?

December has the shortest days of the year, with an average of 10h and 0min of daylight.

How many hours of daylight does McKinney have in December?

The average day length in December in McKinney, Texas, is 10h and 0min.

When are sunrise and sunset in December in McKinney?

On the first day of December in McKinney, sunrise is at 7:11 am and sunset at 5:19 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 5:29 pm CST.

What is the month with the least sunshine in McKinney?

The month with the least sunshine in McKinney is December, with an average of 5.6h of sunshine.

How long on average sun shines in December in McKinney?

The average sunshine duration in December is 5.6h.

What are the months with the lowest UV index in McKinney?

The months with the lowest UV index in McKinney are January, November and December, with an average maximum UV index of 3.

What is the UV index intensity in December in McKinney?

In December, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
McKinney, TX

Average temperature in December - McKinney, TX
  • Average high temperature in December: 54.5°F

The warmest month (with the highest average high temperature) is August (94.8°F).
The month with the lowest average high temperature is January (53.2°F).

  • Average low temperature in December: 40.3°F

The month with the highest average low temperature is August (75.2°F).
The coldest month (with the lowest average low temperature) is January (37.9°F).

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Average pressure in December
McKinney, TX

Average pressure in December - McKinney, TX
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in December
McKinney, TX

Average wind speed in December - McKinney, TX
  • Average wind speed in December: 8.8mph

The windiest month (with the highest average wind speed) is March (10.1mph).
The calmest month (with the lowest average wind speed) is September (6.8mph).

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Average humidity in December
McKinney, TX

Average humidity in December - McKinney, TX
  • Average humidity in December: 71%

The month with the highest relative humidity is May (76%).
The month with the lowest relative humidity is August (59%).

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Average rainfall in December
McKinney, TX

Average rainfall in December - McKinney, TX
  • Average rainfall in December: 2.17"

The wettest month (with the highest rainfall) is October (4.17").
The driest month (with the least rainfall) is January (1.77").

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Average rainfall days in December
McKinney, TX

Average rainfall days in December - McKinney, TX
  • Average rainfall days in December: 9.4 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (7.3 days).

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Average snowfall in December
McKinney, TX

Average snowfall in December - McKinney, TX
  • Average snowfall in December: 0.08"

The month with the highest snowfall is February (0.71").
The months with the least snowfall are March, April, May, June, July, August, September and October (0").

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Average snowfall days in December
McKinney, TX

Average snowfall days in December - McKinney, TX
  • Average snowfall days in December: 0.3 days

The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
McKinney, TX

Average daylight in December / Average sunshine in December - McKinney, TX
  • Average daylight in December: 10h and 0min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in December: 5h and 4min

The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).

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Average sunshine days in December
McKinney, TX

Average sunshine days in December - McKinney, TX
  • Average sunshine days in December: 19.6 days

The month with the most sunshine days is January (22.3 days).
The month with the least sunshine days is September (13.6 days).

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Average UV index in December
McKinney, TX

Average UV index in December - McKinney, TX
  • Average UV index in December: 3

The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, November and December (UV index 3).

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Average cloud cover in December
McKinney, TX

Average cloud cover in December - McKinney, TX
  • Average cloud cover in December: 38

The months with the most cloud cover are February and March (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 20).

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Average visibility in December
McKinney, TX

Average visibility in December - McKinney, TX
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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