Sure! Here's a table with each US state's average December temperature given in both Fahrenheit and Celsius, and I have included the average monthly precipitation during the winter months. The table is sorted in descending order by temperature and ascending order by precipitation. 

**Answer: If you like dry, mild weather, I would recommend visiting states in the southwest US like Texas, Arizona, or Nevada during December. However, some states have large geographical variation, and weather conditions can vary dramatically from location to location. I'd recommend checking the local weather forecast before embarking on your trip.**

I was unable to find the monthly temperature variance for each state. If you have that information, I would be happy to incorporate it for you.

### Average Monthly Temperature and Precipitation 
| State | Fahrenheit  | Celsius | Precipitation (mm) |
| --- | --- | --- | --- |
| Hawaii | 70 | 21.11 | 152 |
| Florida | 65 | 18.33 | 81 |
| Georgia | 53 | 11.67 | 116 |
| Texas | 52 | 11.11 | 43 |
| Louisiana | 52 | 11.11 | 135 |
| California | 50 | 10 | 96 |
| Alabama | 50 | 10 | 136 |
| Arizona | 48 | 8.89 | 31 |
| South Carolina | 48 | 8.89 | 103 |
| Mississippi | 48 | 8.89 | 139 |
| Nevada | 44 | 6.67 | 22 |
| New Mexico | 43 | 6.11 | 17 |
| Oregon | 43 | 6.11 | 93 |
| North Carolina | 43 | 6.11 | 100 |
| Arkansas | 42 | 5.56 | 101 |
| Tennessee | 42 | 5.56 | 120 |
| Oklahoma | 40 | 4.44 | 44 |
| Virginia | 40 | 4.44 | 84 |
| Washington | 40 | 4.44 | 133 |
| Maryland | 39 | 3.89 | 86 |
| Missouri | 37 | 2.78 | 58 |
| Kentucky | 37 | 2.78 | 101 |
| West Virginia | 36 | 2.22 | 85 |
| Delaware | 36 | 2.22 | 90 |
| New Jersey | 36 | 2.22 | 90 |
| Connecticut | 36 | 2.22 | 98 |
| Kansas | 35 | 1.67 | 22 |
| Colorado | 34 | 1.11 | 20 |
| Illinois | 34 | 1.11 | 56 |
| Pennsylvania | 34 | 1.11 | 74 |
| Massachusetts | 34 | 1.11 | 97 |
| Rhode Island | 34 | 1.11 | 105 |
| Utah | 33 | 0.56 | 24 |
| Indiana | 33 | 0.56 | 66 |
| New York | 33 | 0.56 | 73 |
| Ohio | 32 | 0 | 65 |
| Maine | 31 | -0.56 | 80 |
| Nebraska | 29 | -1.67 | 14 |
| New Hampshire | 29 | -1.67 | 80 |
| Michigan | 28 | -2.22 | 49 |
| Vermont | 28 | -2.22 | 72 |
| Iowa | 27 | -2.78 | 27 |
| Idaho | 27 | -2.78 | 51 |
| South Dakota | 25 | -3.89 | 12 |
| Wyoming | 24 | -4.44 | 15 |
| Wisconsin | 24 | -4.44 | 30 |
| Montana | 23 | -5 | 19 |
| Minnesota | 19 | -7.22 | 19 |
| North Dakota | 18 | -7.78 | 12 |
| Alaska | 15 | -9.44 | 41 |
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