Clifton weather in May
In May, Clifton sees average daytime highs of 70°F and overnight lows near 44°F, with 1.9 in of precipitation across 8.8 wet days and about 14.1 hours of daylight. It is the 5th-warmest and 7th-wettest month of the year here.
Highs climb over the month, from about 65°F in the first days to 75°F by the end. The sky is clear or mostly clear about 33% of the time in May, and the air most often feels dry.
Daylight stretches from about 13 h 36 min at the start of May to 14 h 30 min by month's end. Set against the rest of the year, May is Clifton's 10th-clearest and 2nd-windiest month. For the whole year in context, see Clifton's year-round climate.
- Daytime high
- 70°
- 5th warmest
- Overnight low
- 44°
- 8th coldest
- Precipitation
- 1.9 in
- 8.8 wet days
- Daylight
- 14 h 06 min
- 5:06 AM – 7:14 PM
- Cloud cover
- 53%
- 10th clearest
- Wind
- 5 mph
- 2nd windiest
- Solar energy
- 7.34 kWh/m²
- Travel score
- 6.8
- out of 10
Clifton is census-designated place in Mesa County, Colorado, United States.
- Density
- 1,250/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in May
Highs climb over the month, from about 65°F in the first days to 75°F by the end.
A typical May day in Clifton reaches about 70°F in the afternoon and slips back to 44°F overnight — a 26°F spread between the day's warmth and the night's chill. On most days the high lands between 57°F and 81°F. Set against its neighbours, May runs about 12°F warmer than April and about 12°F cooler than June.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 64 | 64 | 65 | 65 | 65 | 66 | 66 | 67 | 67 | 68 | 68 | 69 | 69 | 69 | 70 | 70 | 70 | 71 | 71 | 71 | 72 | 72 | 73 | 73 | 73 | 74 | 74 | 75 | 75 | 76 | 76 |
| Avg low (°F) | 38 | 39 | 39 | 40 | 40 | 40 | 41 | 41 | 41 | 42 | 42 | 42 | 43 | 43 | 44 | 44 | 44 | 45 | 45 | 45 | 46 | 46 | 46 | 46 | 47 | 47 | 47 | 47 | 48 | 48 | 48 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 64 | 38 |
| 2 | 64 | 39 |
| 3 | 65 | 39 |
| 4 | 65 | 40 |
| 5 | 65 | 40 |
| 6 | 66 | 40 |
| 7 | 66 | 41 |
| 8 | 67 | 41 |
| 9 | 67 | 41 |
| 10 | 68 | 42 |
| 11 | 68 | 42 |
| 12 | 69 | 42 |
| 13 | 69 | 43 |
| 14 | 69 | 43 |
| 15 | 70 | 44 |
| 16 | 70 | 44 |
| 17 | 70 | 44 |
| 18 | 71 | 45 |
| 19 | 71 | 45 |
| 20 | 71 | 45 |
| 21 | 72 | 46 |
| 22 | 72 | 46 |
| 23 | 73 | 46 |
| 24 | 73 | 46 |
| 25 | 73 | 47 |
| 26 | 74 | 47 |
| 27 | 74 | 47 |
| 28 | 75 | 47 |
| 29 | 75 | 48 |
| 30 | 76 | 48 |
| 31 | 76 | 48 |
How May really feels in Clifton
Once humidity and wind are folded in, May averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Clifton weather by month
How May compares with the rest of the year at a glance. May is the 5th-warmest and 7th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 34° / 13° | 1.5 | 7.5 | 7.2 | 9.6 | 0.0 |
| Feb | 39° / 19° | 1.7 | 9 | 8.1 | 10.5 | 0.0 |
| Mar | 49° / 27° | 2.0 | 9.5 | 6.5 | 11.7 | 2.2 |
| Apr | 58° / 34° | 2.0 | 9.7 | 3.8 | 13 | 4.5 |
| May | 70° / 44° | 1.9 | 8.8 | 0.6 | 14.1 | 6.8 |
| Jun | 82° / 53° | 1.0 | 4.8 | 0 | 14.7 | 7.0 |
| Jul | 87° / 60° | 2.2 | 8.6 | 0 | 14.5 | 5.1 |
| Aug | 83° / 58° | 3.2 | 11.7 | 0 | 13.5 | 5.9 |
| Sep | 75° / 49° | 2.7 | 8.9 | 0.1 | 12.3 | 7.3 |
| Oct | 62° / 37° | 2.0 | 8.1 | 1.6 | 11 | 5.8 |
| Nov | 47° / 25° | 1.7 | 7 | 4.9 | 9.9 | 1.6 |
| Dec | 35° / 15° | 1.5 | 7.3 | 7.3 | 9.3 | 0.0 |
Cloud cover in May
The sky is clear or mostly clear about 33% of the time in May.
Beyond those clear spells, partly cloudy skies cover about 24% of May, with mostly cloudy or overcast conditions the remaining 43%. Skies tend to open up as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 52 | 52 | 52 | 52 | 52 | 53 | 54 | 54 | 54 | 55 | 55 | 55 | 55 | 55 | 55 | 56 | 56 | 56 | 57 | 57 | 58 | 59 | 59 | 61 | 61 | 63 | 63 | 64 | 65 | 66 | 68 |
| Cloudier (%) | 48 | 48 | 48 | 48 | 48 | 47 | 46 | 46 | 46 | 45 | 45 | 45 | 45 | 45 | 45 | 44 | 44 | 44 | 43 | 43 | 42 | 41 | 41 | 39 | 39 | 37 | 37 | 36 | 35 | 34 | 32 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 52 | 48 |
| 2 | 52 | 48 |
| 3 | 52 | 48 |
| 4 | 52 | 48 |
| 5 | 52 | 48 |
| 6 | 53 | 47 |
| 7 | 54 | 46 |
| 8 | 54 | 46 |
| 9 | 54 | 46 |
| 10 | 55 | 45 |
| 11 | 55 | 45 |
| 12 | 55 | 45 |
| 13 | 55 | 45 |
| 14 | 55 | 45 |
| 15 | 55 | 45 |
| 16 | 56 | 44 |
| 17 | 56 | 44 |
| 18 | 56 | 44 |
| 19 | 57 | 43 |
| 20 | 57 | 43 |
| 21 | 58 | 42 |
| 22 | 59 | 41 |
| 23 | 59 | 41 |
| 24 | 61 | 39 |
| 25 | 61 | 39 |
| 26 | 63 | 37 |
| 27 | 63 | 37 |
| 28 | 64 | 36 |
| 29 | 65 | 35 |
| 30 | 66 | 34 |
| 31 | 68 | 32 |
Chance of precipitation in May
Clifton gets around 1.9 in of rain and snow over 8.8 wet days in May. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 28% and peaks near 31% on the wettest days, and about 1 day brings snow. The odds ease toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 31 | 31 | 31 | 31 | 31 | 31 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 27 | 27 | 26 | 25 | 25 | 24 | 23 | 22 | 21 |
| Snow chance (%) | 7 | 6 | 6 | 6 | 5 | 5 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 31 | 7 |
| 2 | 31 | 6 |
| 3 | 31 | 6 |
| 4 | 31 | 6 |
| 5 | 31 | 5 |
| 6 | 31 | 5 |
| 7 | 30 | 4 |
| 8 | 30 | 4 |
| 9 | 30 | 3 |
| 10 | 30 | 3 |
| 11 | 30 | 3 |
| 12 | 30 | 3 |
| 13 | 30 | 3 |
| 14 | 30 | 2 |
| 15 | 30 | 2 |
| 16 | 29 | 2 |
| 17 | 29 | 2 |
| 18 | 29 | 1 |
| 19 | 29 | 1 |
| 20 | 28 | 1 |
| 21 | 28 | 1 |
| 22 | 28 | 1 |
| 23 | 27 | 1 |
| 24 | 27 | 1 |
| 25 | 26 | 0 |
| 26 | 25 | 0 |
| 27 | 25 | 0 |
| 28 | 24 | 0 |
| 29 | 23 | 0 |
| 30 | 22 | 0 |
| 31 | 21 | 0 |
Humidity in May
Most of May feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, May lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Dry (%) | |
|---|---|
| 1 | 100 |
| 2 | 100 |
| 3 | 100 |
| 4 | 100 |
| 5 | 100 |
| 6 | 100 |
| 7 | 100 |
| 8 | 100 |
| 9 | 100 |
| 10 | 100 |
| 11 | 100 |
| 12 | 100 |
| 13 | 100 |
| 14 | 100 |
| 15 | 100 |
| 16 | 100 |
| 17 | 100 |
| 18 | 100 |
| 19 | 100 |
| 20 | 100 |
| 21 | 100 |
| 22 | 100 |
| 23 | 100 |
| 24 | 100 |
| 25 | 100 |
| 26 | 100 |
| 27 | 100 |
| 28 | 100 |
| 29 | 100 |
| 30 | 100 |
| 31 | 100 |
Wind in May
Winds average 5 mph in May.
Across May, daily wind ranges from about 5 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 5 | calm |
| 2 | 5 | calm |
| 3 | 5 | calm |
| 4 | 5 | calm |
| 5 | 5 | calm |
| 6 | 5 | calm |
| 7 | 5 | calm |
| 8 | 5 | calm |
| 9 | 5 | calm |
| 10 | 5 | calm |
| 11 | 5 | calm |
| 12 | 5 | calm |
| 13 | 5 | calm |
| 14 | 5 | calm |
| 15 | 5 | calm |
| 16 | 5 | calm |
| 17 | 5 | calm |
| 18 | 5 | calm |
| 19 | 5 | calm |
| 20 | 5 | calm |
| 21 | 5 | calm |
| 22 | 5 | calm |
| 23 | 5 | calm |
| 24 | 5 | calm |
| 25 | 5 | calm |
| 26 | 5 | calm |
| 27 | 5 | calm |
| 28 | 5 | calm |
| 29 | 5 | calm |
| 30 | 5 | calm |
| 31 | 5 | calm |
Sunrise & sunset in May
Daylight runs from about 13 h 36 min at the start of May to 14 h 30 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 54 minutes over May. Sunrise moves from 5:22 AM to 4:56 AM, and sunset from 7:00 PM to 7:27 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.6 | 13.7 | 13.7 | 13.7 | 13.8 | 13.8 | 13.8 | 13.9 | 13.9 | 13.9 | 14.0 | 14.0 | 14.0 | 14.1 | 14.1 | 14.1 | 14.2 | 14.2 | 14.2 | 14.2 | 14.3 | 14.3 | 14.3 | 14.4 | 14.4 | 14.4 | 14.4 | 14.5 | 14.5 | 14.5 | 14.5 |
| Sunrise (AM) | 5:22 | 5:21 | 5:20 | 5:19 | 5:18 | 5:16 | 5:15 | 5:14 | 5:13 | 5:12 | 5:11 | 5:10 | 5:09 | 5:08 | 5:07 | 5:06 | 5:05 | 5:04 | 5:04 | 5:03 | 5:02 | 5:01 | 5:00 | 5:00 | 4:59 | 4:58 | 4:58 | 4:57 | 4:57 | 4:56 | 4:56 |
| Sunset (PM) | 7:00 | 7:01 | 7:01 | 7:02 | 7:03 | 7:04 | 7:05 | 7:06 | 7:07 | 7:08 | 7:09 | 7:10 | 7:11 | 7:12 | 7:13 | 7:14 | 7:15 | 7:16 | 7:17 | 7:18 | 7:18 | 7:19 | 7:20 | 7:21 | 7:22 | 7:23 | 7:24 | 7:24 | 7:25 | 7:26 | 7:27 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.6 | 5:22 | 7:00 |
| 2 | 13.7 | 5:21 | 7:01 |
| 3 | 13.7 | 5:20 | 7:01 |
| 4 | 13.7 | 5:19 | 7:02 |
| 5 | 13.8 | 5:18 | 7:03 |
| 6 | 13.8 | 5:16 | 7:04 |
| 7 | 13.8 | 5:15 | 7:05 |
| 8 | 13.9 | 5:14 | 7:06 |
| 9 | 13.9 | 5:13 | 7:07 |
| 10 | 13.9 | 5:12 | 7:08 |
| 11 | 14.0 | 5:11 | 7:09 |
| 12 | 14.0 | 5:10 | 7:10 |
| 13 | 14.0 | 5:09 | 7:11 |
| 14 | 14.1 | 5:08 | 7:12 |
| 15 | 14.1 | 5:07 | 7:13 |
| 16 | 14.1 | 5:06 | 7:14 |
| 17 | 14.2 | 5:05 | 7:15 |
| 18 | 14.2 | 5:04 | 7:16 |
| 19 | 14.2 | 5:04 | 7:17 |
| 20 | 14.2 | 5:03 | 7:18 |
| 21 | 14.3 | 5:02 | 7:18 |
| 22 | 14.3 | 5:01 | 7:19 |
| 23 | 14.3 | 5:00 | 7:20 |
| 24 | 14.4 | 5:00 | 7:21 |
| 25 | 14.4 | 4:59 | 7:22 |
| 26 | 14.4 | 4:58 | 7:23 |
| 27 | 14.4 | 4:58 | 7:24 |
| 28 | 14.5 | 4:57 | 7:24 |
| 29 | 14.5 | 4:57 | 7:25 |
| 30 | 14.5 | 4:56 | 7:26 |
| 31 | 14.5 | 4:56 | 7:27 |
Solar energy in May
Average shortwave solar energy reaching the ground each day in May, about 7.34 kWh/m².
For context, solar energy here swings from a low near 2.58 kWh/m² to a high of 8.07 kWh/m² in June across the year — May's 7.34 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 7.0 | 7.0 | 7.0 | 7.0 | 7.1 | 7.1 | 7.1 | 7.1 | 7.2 | 7.2 | 7.2 | 7.2 | 7.3 | 7.3 | 7.3 | 7.3 | 7.3 | 7.4 | 7.4 | 7.4 | 7.5 | 7.5 | 7.5 | 7.5 | 7.6 | 7.6 | 7.7 | 7.7 | 7.7 | 7.8 | 7.8 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 7.0 | Intense |
| 2 | 7.0 | Intense |
| 3 | 7.0 | Intense |
| 4 | 7.0 | Intense |
| 5 | 7.1 | Intense |
| 6 | 7.1 | Intense |
| 7 | 7.1 | Intense |
| 8 | 7.1 | Intense |
| 9 | 7.2 | Intense |
| 10 | 7.2 | Intense |
| 11 | 7.2 | Intense |
| 12 | 7.2 | Intense |
| 13 | 7.3 | Intense |
| 14 | 7.3 | Intense |
| 15 | 7.3 | Intense |
| 16 | 7.3 | Intense |
| 17 | 7.3 | Intense |
| 18 | 7.4 | Intense |
| 19 | 7.4 | Intense |
| 20 | 7.4 | Intense |
| 21 | 7.5 | Intense |
| 22 | 7.5 | Intense |
| 23 | 7.5 | Intense |
| 24 | 7.5 | Intense |
| 25 | 7.6 | Intense |
| 26 | 7.6 | Intense |
| 27 | 7.7 | Intense |
| 28 | 7.7 | Intense |
| 29 | 7.7 | Intense |
| 30 | 7.8 | Intense |
| 31 | 7.8 | Intense |
Is May a good time to visit Clifton?
Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
May is a reasonable time to visit Clifton for sightseeing.
What to pack for Clifton in May
From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In May, Clifton sees daytime highs around 70°F and nights near 44°F. Pack sun protection. Worth having: a warm layer and rain gear. About 9 days see rain.
UV index in Clifton in May
Clear-sky midday UV in May peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Clifton peaks around July 16 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 4 | 6 | 6 | 8 | 11 | 11 | 10 | 7 | 6 | 3 | 2 |
| Level | Moderate | Moderate | High | High | Very high | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 6 | High |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 10 | Extreme |
| Sep | 7 | Very high |
| Oct | 6 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Moderate |
Where is Clifton?
Clifton sits at 39.1°N, 108.4°W, 4,724 ft above sea level, in United States. The nearest listed city is Grand Junction, 5.6 mi away.
Topography around Clifton
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Clifton.
Within 2 miles, the terrain around Clifton has only modest variations in elevation — a maximum elevation change of 322 ft around an average of 4,728 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 4,150 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,149 ft.
The land around Clifton is covered by artificial surfaces (31%) and grassland (21%) within 2 miles, grassland (34%) and bare terrain (22%) within 10 miles, and trees (40%), grassland (25%) and shrubs (22%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Clifton (39.0919°, -108.449°, elevation 4,724 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).