Mammoth Lakes, California, USA UV Index in January
The average UV index in Mammoth Lakes, California, USA in January is about 4.8 (Moderate), peaking near 7.5 at midday on clear days. Fair skin (Type II) can burn in roughly 19 minutes without sunscreen. Wear SPF 30+ sunscreen if you are outside for more than an hour, especially near water or sand.
What is the UV index in Mammoth Lakes, California, USA in January?
Average UV
4.8
Moderate
Midday Peak
7.5
Clear-sky estimate
Fair Skin Burn Time
19 min
Type II, no sunscreen
How long can you stay in the sun in Mammoth Lakes, California, USA in January?
| Skin type | Time to first burn | With SPF 30 |
|---|---|---|
| Type 1 | 13 min | up to 240 min |
| Type 2 | 19 min | up to 240 min |
| Type 3 | 31 min | up to 240 min |
| Type 4 | 50 min | up to 240 min |
| Type 5 | 75 min | up to 240 min |
| Type 6 | 113 min | up to 240 min |
Estimates based on Mammoth Lakes, California, USA's latitude and typical January sun angle. Cloud cover, altitude and reflection from water or sand can raise or lower the real UV. Check the live forecast before long days outside.
Mammoth Lakes, California, USA UV Index by Month
When is the UV index highest and lowest in Mammoth Lakes, California, USA?
Highest: June (about 7). Lowest: December (about 4.6).
| Month | Average UV | Midday peak | Level | Fair skin burn |
|---|---|---|---|---|
| January | 4.8 | 7.5 | Moderate | 19 min |
| February | 5.4 | 8.5 | Moderate | 17 min |
| March | 6.1 | 9.6 | High | 15 min |
| April | 6.6 | 10.4 | High | 14 min |
| May | 6.9 | 10.8 | High | 13 min |
| June | 7 | 11 | High | 13 min |
| July | 7 | 11 | High | 13 min |
| August | 6.8 | 10.7 | High | 13 min |
| September | 6.3 | 9.9 | High | 14 min |
| October | 5.7 | 9 | Moderate | 16 min |
| November | 5 | 7.9 | Moderate | 18 min |
| December | 4.6 | 7.2 | Moderate | 20 min |
Common questions about UV in Mammoth Lakes, California, USA in January
Do you need sunscreen in Mammoth Lakes, California, USA in January?
Yes. A UV index of 4.8 is Moderate, so use SPF 30+ on exposed skin between 10am and 4pm and reapply every two hours.
Can you tan in Mammoth Lakes, California, USA in January?
Yes, UV of 4.8 is strong enough to tan. Fair skin can burn in about 19 minutes, so build exposure slowly and use sunscreen.
What time of day is UV strongest in Mammoth Lakes, California, USA?
UV peaks around solar noon, roughly 11am to 2pm local time, when it can reach about 7.5 in January. Mornings and late afternoons are safest.
Is January a good month to visit Mammoth Lakes, California, USA for the sun?
January averages UV 4.8, compared with a yearly high of 7 in June and a low of 4.6 in December. Darker skin (Type VI) can burn in about 113 minutes at this level.