The sun, month by month
Sunrise and sunset in Mexico City in December
On December 1 in Mexico City the sun rises at 06:55 and sets at 17:57; on day 31 it rises at 07:10 and sets at 18:09. Over the month the day barely changes.
Where does the sun rise and set in Mexico City in December?
Mid-December in Mexico City: the sun rises in the southeast — a bearing of 115°, measured from true north — and sets in the southwest, at 245°. That is 25° south of due east at sunrise, and the same 25° south of due west at sunset. From the 1st to the last day of the month both points barely move.
Approximate bearings: they can be a couple of degrees out. They are measured from true north, not the north a phone compass points to.
Day by day
All times are local to Mexico City. Dawn and dusk mark civil twilight.
| Day | Dawn | Sunrise | Sunset | Dusk | Day length |
|---|---|---|---|---|---|
| 1 | 06:32 | 06:55 | 17:57 | 18:21 | 11 h 02 min |
| 2 | 06:32 | 06:56 | 17:57 | 18:21 | 11 h 01 min |
| 3 | 06:33 | 06:57 | 17:58 | 18:21 | 11 h 01 min |
| 4 | 06:34 | 06:57 | 17:58 | 18:22 | 11 h 01 min |
| 5 | 06:34 | 06:58 | 17:58 | 18:22 | 11 h 00 min |
| 6 | 06:35 | 06:58 | 17:58 | 18:22 | 11 h 00 min |
| 7 | 06:35 | 06:59 | 17:59 | 18:22 | 11 h 00 min |
| 8 | 06:36 | 07:00 | 17:59 | 18:23 | 10 h 59 min |
| 9 | 06:36 | 07:00 | 17:59 | 18:23 | 10 h 59 min |
| 10 | 06:37 | 07:01 | 17:59 | 18:23 | 10 h 59 min |
| 11 | 06:37 | 07:01 | 18:00 | 18:24 | 10 h 58 min |
| 12 | 06:38 | 07:02 | 18:00 | 18:24 | 10 h 58 min |
| 13 | 06:38 | 07:02 | 18:00 | 18:24 | 10 h 58 min |
| 14 | 06:39 | 07:03 | 18:01 | 18:25 | 10 h 58 min |
| 15 | 06:40 | 07:03 | 18:01 | 18:25 | 10 h 58 min |
| 16 | 06:40 | 07:04 | 18:02 | 18:26 | 10 h 58 min |
| 17 | 06:41 | 07:04 | 18:02 | 18:26 | 10 h 58 min |
| 18 | 06:41 | 07:05 | 18:02 | 18:26 | 10 h 57 min |
| 19 | 06:42 | 07:05 | 18:03 | 18:27 | 10 h 57 min |
| 20 | 06:42 | 07:06 | 18:03 | 18:27 | 10 h 57 min |
| 21 | 06:43 | 07:06 | 18:04 | 18:28 | 10 h 57 min |
| 22 | 06:43 | 07:07 | 18:04 | 18:28 | 10 h 57 min |
| 23 | 06:43 | 07:07 | 18:05 | 18:29 | 10 h 57 min |
| 24 | 06:44 | 07:08 | 18:05 | 18:29 | 10 h 58 min |
| 25 | 06:44 | 07:08 | 18:06 | 18:30 | 10 h 58 min |
| 26 | 06:45 | 07:09 | 18:06 | 18:30 | 10 h 58 min |
| 27 | 06:45 | 07:09 | 18:07 | 18:31 | 10 h 58 min |
| 28 | 06:46 | 07:09 | 18:07 | 18:31 | 10 h 58 min |
| 29 | 06:46 | 07:10 | 18:08 | 18:32 | 10 h 58 min |
| 30 | 06:46 | 07:10 | 18:09 | 18:32 | 10 h 58 min |
| 31 | 06:47 | 07:10 | 18:09 | 18:33 | 10 h 59 min |
Approximate astronomical values: they can shift a minute or two from year to year.
What about vitamin D in December?
In December, the typical synthesis window in Mexico City runs from 10:00 to 16:00: with medium skin and a t-shirt, ~7 min at the best moment is enough.
See the Mexico City vitamin D guideCommon questions about the sun in Mexico City in December
- Where does the sun set in Mexico City in December?
- Mid-December in Mexico City: the sun sets in the southwest, a bearing of 245° measured from true north, which is 25° south of due west. It rises in the southeast, at 115°. Over the month both points barely move.
- How much does day length change in Mexico City in December?
- Over December day length barely changes in Mexico City: less than four minutes between December 1, with the sun up from 06:55 to 17:57, and day 31, from 07:10 to 18:09.
- How many hours of daylight does Mexico City get in December?
- In mid-December the day lasts 10 h 58 min in Mexico City, from sunrise at 07:03 to sunset at 18:01. The table has the day length for each of the 31 days of the month.
- What time does it start to get light in Mexico City in December?
- In mid-December the sky starts to get light at 06:40 in Mexico City, when the sun is 6° below the horizon, and the sun itself does not rise until 07:03. The “Dawn” column of the table gives that time for every day of the month.
- What time does it get dark in Mexico City in December?
- It's not the same time as sunset. In mid-December in Mexico City the sun sets at 18:01, but there is still light: civil twilight does not end until 18:25, when the sun reaches 6° below the horizon and usable outdoor light runs out. The “Dusk” column of the table gives that time day by day.
- What time of day can you make vitamin D in Mexico City in December?
- In mid-December, between 10:00 and 16:00: that is the stretch of the day when the UV index reaches 3 in Mexico City, the minimum for the skin to make vitamin D. At the best moment of the day about 7 minutes are enough for a mid-range skin phototype with a quarter of the body exposed to make around 1000 IU.