Upper Alton weather in August
In August, Upper Alton sees average daytime highs of 85°F and overnight lows near 67°F, with 2.9 in of rain across 8.9 wet days and about 13.5 hours of daylight. It is the 2nd-warmest and 9th-wettest month of the year here.
Day-to-day highs hold fairly steady near 85°F through the month. The sky is clear or mostly clear about 43% of the time in August, and the air most often feels muggy.
Daylight stretches from about 14 h 06 min at the start of August to 12 h 54 min by month's end. Set against the rest of the year, August is Upper Alton's 2nd-clearest and 12th-windiest month. For the whole year in context, see Upper Alton's year-round climate.
- Daytime high
- 85°
- 2nd warmest
- Overnight low
- 67°
- 11th coldest
- Rainfall
- 2.9 in
- 8.9 wet days
- Daylight
- 13 h 30 min
- 5:19 AM – 6:51 PM
- Cloud cover
- 50%
- 2nd clearest
- Wind
- 5 mph
- 12th windiest
- Solar energy
- 5.78 kWh/m²
- Travel score
- 5.5
- out of 10
Temperature in August
Day-to-day highs hold fairly steady near 85°F through the month.
A typical August day in Upper Alton reaches about 85°F in the afternoon and slips back to 67°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 78°F and 93°F. Set against its neighbours, August runs about 1°F cooler than July and about 6°F warmer than September.
| 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) | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 84 | 84 | 84 |
| Avg low (°F) | 69 | 69 | 69 | 69 | 69 | 69 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 67 | 67 | 67 | 67 | 67 | 67 | 67 | 67 | 67 | 67 | 67 | 66 | 66 | 66 | 66 | 65 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 86 | 69 |
| 2 | 86 | 69 |
| 3 | 86 | 69 |
| 4 | 86 | 69 |
| 5 | 86 | 69 |
| 6 | 86 | 69 |
| 7 | 86 | 68 |
| 8 | 86 | 68 |
| 9 | 85 | 68 |
| 10 | 85 | 68 |
| 11 | 85 | 68 |
| 12 | 85 | 68 |
| 13 | 85 | 68 |
| 14 | 85 | 68 |
| 15 | 85 | 68 |
| 16 | 85 | 67 |
| 17 | 85 | 67 |
| 18 | 85 | 67 |
| 19 | 85 | 67 |
| 20 | 85 | 67 |
| 21 | 85 | 67 |
| 22 | 85 | 67 |
| 23 | 85 | 67 |
| 24 | 85 | 67 |
| 25 | 85 | 67 |
| 26 | 85 | 67 |
| 27 | 85 | 66 |
| 28 | 85 | 66 |
| 29 | 84 | 66 |
| 30 | 84 | 66 |
| 31 | 84 | 65 |
How August really feels in Upper Alton
Once humidity and wind are folded in, August 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.
August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Upper Alton weather by month
How August compares with the rest of the year at a glance. August is the 2nd-warmest and 9th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 38° / 24° | 2.6 | 8.2 | 3.2 | 9.6 | 0.0 |
| Feb | 43° / 27° | 2.4 | 7.6 | 3 | 10.5 | 0.6 |
| Mar | 54° / 36° | 3.6 | 10.4 | 1.5 | 11.7 | 3.3 |
| Apr | 66° / 47° | 4.6 | 11.6 | 0.2 | 13 | 5.7 |
| May | 75° / 58° | 5.0 | 13.5 | 0 | 14.1 | 6.2 |
| Jun | 83° / 67° | 4.0 | 10.9 | 0 | 14.7 | 5.6 |
| Jul | 87° / 70° | 3.2 | 9.5 | 0 | 14.4 | 5.0 |
| Aug | 85° / 67° | 2.9 | 8.9 | 0 | 13.5 | 5.5 |
| Sep | 79° / 59° | 3.3 | 7.5 | 0 | 12.3 | 7.2 |
| Oct | 67° / 48° | 3.3 | 8.4 | 0.1 | 11 | 6.5 |
| Nov | 53° / 37° | 3.6 | 8.6 | 0.7 | 9.9 | 3.2 |
| Dec | 42° / 28° | 2.4 | 8.1 | 2.3 | 9.3 | 0.4 |
Cloud cover in August
The sky is clear or mostly clear about 43% of the time in August.
Beyond those clear spells, partly cloudy skies cover about 19% of August, with mostly cloudy or overcast conditions the remaining 38%. 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 (%) | 59 | 60 | 60 | 60 | 60 | 60 | 61 | 62 | 62 | 62 | 63 | 63 | 63 | 64 | 64 | 63 | 63 | 63 | 63 | 63 | 63 | 63 | 63 | 62 | 62 | 62 | 62 | 63 | 63 | 63 | 64 |
| Cloudier (%) | 41 | 40 | 40 | 40 | 40 | 40 | 39 | 38 | 38 | 38 | 37 | 37 | 37 | 36 | 36 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 38 | 38 | 38 | 38 | 37 | 37 | 37 | 36 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 59 | 41 |
| 2 | 60 | 40 |
| 3 | 60 | 40 |
| 4 | 60 | 40 |
| 5 | 60 | 40 |
| 6 | 60 | 40 |
| 7 | 61 | 39 |
| 8 | 62 | 38 |
| 9 | 62 | 38 |
| 10 | 62 | 38 |
| 11 | 63 | 37 |
| 12 | 63 | 37 |
| 13 | 63 | 37 |
| 14 | 64 | 36 |
| 15 | 64 | 36 |
| 16 | 63 | 37 |
| 17 | 63 | 37 |
| 18 | 63 | 37 |
| 19 | 63 | 37 |
| 20 | 63 | 37 |
| 21 | 63 | 37 |
| 22 | 63 | 37 |
| 23 | 63 | 37 |
| 24 | 62 | 38 |
| 25 | 62 | 38 |
| 26 | 62 | 38 |
| 27 | 62 | 38 |
| 28 | 63 | 37 |
| 29 | 63 | 37 |
| 30 | 63 | 37 |
| 31 | 64 | 36 |
Chance of precipitation in August
Upper Alton gets around 2.9 in of rain over 8.9 wet days in August. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 29% and peaks near 30% on the wettest days.
| 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 (%) | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 27 | 27 | 26 | 26 | 25 | 25 | 25 |
| Rain chance (%) | |
|---|---|
| 1 | 30 |
| 2 | 30 |
| 3 | 30 |
| 4 | 30 |
| 5 | 30 |
| 6 | 30 |
| 7 | 30 |
| 8 | 30 |
| 9 | 30 |
| 10 | 30 |
| 11 | 30 |
| 12 | 30 |
| 13 | 30 |
| 14 | 30 |
| 15 | 29 |
| 16 | 29 |
| 17 | 29 |
| 18 | 29 |
| 19 | 29 |
| 20 | 29 |
| 21 | 29 |
| 22 | 28 |
| 23 | 28 |
| 24 | 28 |
| 25 | 27 |
| 26 | 27 |
| 27 | 26 |
| 28 | 26 |
| 29 | 25 |
| 30 | 25 |
| 31 | 25 |
Humidity in August
Most of August feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, August lands in the muggy band about 33% of days. Sticky, muggy-or-worse air turns up on roughly 57% of them.
| 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 (%) | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 8 | 9 | 10 | 11 |
| Comfortable (%) | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 15 | 15 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 16 | 16 | 16 | 17 |
| Humid (%) | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 |
| Muggy (%) | 30 | 31 | 32 | 32 | 33 | 33 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 33 | 33 | 33 | 33 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 33 | 32 | 32 | 32 | 31 |
| Oppressive (%) | 30 | 29 | 29 | 28 | 27 | 27 | 26 | 25 | 25 | 25 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 24 | 24 | 23 | 23 | 23 | 22 | 21 | 21 | 20 | 19 |
| Miserable (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 3 | 13 | 22 | 30 | 30 | 1 |
| 2 | 3 | 13 | 22 | 31 | 29 | 1 |
| 3 | 3 | 13 | 22 | 32 | 29 | 1 |
| 4 | 4 | 13 | 22 | 32 | 28 | 1 |
| 5 | 4 | 13 | 22 | 33 | 27 | 1 |
| 6 | 4 | 13 | 22 | 33 | 27 | 1 |
| 7 | 4 | 13 | 22 | 34 | 26 | 1 |
| 8 | 5 | 14 | 21 | 34 | 25 | 1 |
| 9 | 5 | 14 | 21 | 34 | 25 | 1 |
| 10 | 5 | 14 | 21 | 34 | 25 | 1 |
| 11 | 5 | 15 | 20 | 34 | 24 | 1 |
| 12 | 6 | 15 | 20 | 34 | 24 | 1 |
| 13 | 6 | 16 | 20 | 34 | 24 | 1 |
| 14 | 6 | 16 | 20 | 34 | 23 | 1 |
| 15 | 6 | 16 | 21 | 33 | 23 | 1 |
| 16 | 6 | 16 | 21 | 33 | 23 | 1 |
| 17 | 6 | 16 | 21 | 33 | 23 | 1 |
| 18 | 6 | 16 | 21 | 33 | 23 | 1 |
| 19 | 6 | 16 | 21 | 32 | 23 | 1 |
| 20 | 6 | 16 | 22 | 32 | 23 | 1 |
| 21 | 6 | 16 | 22 | 32 | 23 | 1 |
| 22 | 6 | 16 | 22 | 32 | 24 | 1 |
| 23 | 6 | 15 | 22 | 32 | 24 | 1 |
| 24 | 6 | 15 | 22 | 32 | 23 | 1 |
| 25 | 7 | 15 | 22 | 32 | 23 | 0 |
| 26 | 7 | 15 | 22 | 32 | 23 | 0 |
| 27 | 7 | 15 | 22 | 33 | 22 | 0 |
| 28 | 8 | 16 | 22 | 32 | 21 | 0 |
| 29 | 9 | 16 | 22 | 32 | 21 | 0 |
| 30 | 10 | 16 | 22 | 32 | 20 | 0 |
| 31 | 11 | 17 | 22 | 31 | 19 | 0 |
Wind in August
Winds average 5 mph in August, the calmest month.
Across August, daily wind ranges from about 5 mph on the calmest days to 6 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 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| 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 | 6 | calm |
| 21 | 6 | calm |
| 22 | 6 | calm |
| 23 | 6 | calm |
| 24 | 6 | calm |
| 25 | 6 | calm |
| 26 | 6 | calm |
| 27 | 6 | calm |
| 28 | 6 | calm |
| 29 | 6 | calm |
| 30 | 6 | calm |
| 31 | 6 | calm |
Sunrise & sunset in August
Daylight runs from about 14 h 06 min at the start of August to 12 h 54 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 72 minutes over August. Sunrise moves from 5:05 AM to 5:33 AM, and sunset from 7:08 PM to 6:29 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) | 14.1 | 14.0 | 14.0 | 14.0 | 13.9 | 13.9 | 13.9 | 13.8 | 13.8 | 13.8 | 13.7 | 13.7 | 13.6 | 13.6 | 13.6 | 13.5 | 13.5 | 13.5 | 13.4 | 13.4 | 13.3 | 13.3 | 13.3 | 13.2 | 13.2 | 13.1 | 13.1 | 13.1 | 13.0 | 13.0 | 12.9 |
| Sunrise (AM) | 5:05 | 5:06 | 5:07 | 5:08 | 5:09 | 5:10 | 5:10 | 5:11 | 5:12 | 5:13 | 5:14 | 5:15 | 5:16 | 5:17 | 5:18 | 5:19 | 5:20 | 5:21 | 5:22 | 5:22 | 5:23 | 5:24 | 5:25 | 5:26 | 5:27 | 5:28 | 5:29 | 5:30 | 5:31 | 5:32 | 5:33 |
| Sunset (PM) | 7:08 | 7:07 | 7:06 | 7:05 | 7:04 | 7:03 | 7:02 | 7:01 | 7:00 | 6:58 | 6:57 | 6:56 | 6:55 | 6:53 | 6:52 | 6:51 | 6:49 | 6:48 | 6:47 | 6:45 | 6:44 | 6:42 | 6:41 | 6:39 | 6:38 | 6:36 | 6:35 | 6:33 | 6:32 | 6:30 | 6:29 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 14.1 | 5:05 | 7:08 |
| 2 | 14.0 | 5:06 | 7:07 |
| 3 | 14.0 | 5:07 | 7:06 |
| 4 | 14.0 | 5:08 | 7:05 |
| 5 | 13.9 | 5:09 | 7:04 |
| 6 | 13.9 | 5:10 | 7:03 |
| 7 | 13.9 | 5:10 | 7:02 |
| 8 | 13.8 | 5:11 | 7:01 |
| 9 | 13.8 | 5:12 | 7:00 |
| 10 | 13.8 | 5:13 | 6:58 |
| 11 | 13.7 | 5:14 | 6:57 |
| 12 | 13.7 | 5:15 | 6:56 |
| 13 | 13.6 | 5:16 | 6:55 |
| 14 | 13.6 | 5:17 | 6:53 |
| 15 | 13.6 | 5:18 | 6:52 |
| 16 | 13.5 | 5:19 | 6:51 |
| 17 | 13.5 | 5:20 | 6:49 |
| 18 | 13.5 | 5:21 | 6:48 |
| 19 | 13.4 | 5:22 | 6:47 |
| 20 | 13.4 | 5:22 | 6:45 |
| 21 | 13.3 | 5:23 | 6:44 |
| 22 | 13.3 | 5:24 | 6:42 |
| 23 | 13.3 | 5:25 | 6:41 |
| 24 | 13.2 | 5:26 | 6:39 |
| 25 | 13.2 | 5:27 | 6:38 |
| 26 | 13.1 | 5:28 | 6:36 |
| 27 | 13.1 | 5:29 | 6:35 |
| 28 | 13.1 | 5:30 | 6:33 |
| 29 | 13.0 | 5:31 | 6:32 |
| 30 | 13.0 | 5:32 | 6:30 |
| 31 | 12.9 | 5:33 | 6:29 |
Solar energy in August
Average shortwave solar energy reaching the ground each day in August, about 5.78 kWh/m².
For context, solar energy here swings from a low near 1.88 kWh/m² to a high of 6.44 kWh/m² in June across the year — August's 5.78 kWh/m² falls in the middle.
| 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) | 6.2 | 6.2 | 6.1 | 6.1 | 6.1 | 6.0 | 6.0 | 6.0 | 6.0 | 5.9 | 5.9 | 5.9 | 5.8 | 5.8 | 5.8 | 5.8 | 5.7 | 5.7 | 5.7 | 5.7 | 5.6 | 5.6 | 5.6 | 5.5 | 5.5 | 5.5 | 5.4 | 5.4 | 5.4 | 5.3 | 5.3 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.2 | Intense |
| 2 | 6.2 | Intense |
| 3 | 6.1 | Intense |
| 4 | 6.1 | Intense |
| 5 | 6.1 | Intense |
| 6 | 6.0 | Intense |
| 7 | 6.0 | Intense |
| 8 | 6.0 | Intense |
| 9 | 6.0 | Bright |
| 10 | 5.9 | Bright |
| 11 | 5.9 | Bright |
| 12 | 5.9 | Bright |
| 13 | 5.8 | Bright |
| 14 | 5.8 | Bright |
| 15 | 5.8 | Bright |
| 16 | 5.8 | Bright |
| 17 | 5.7 | Bright |
| 18 | 5.7 | Bright |
| 19 | 5.7 | Bright |
| 20 | 5.7 | Bright |
| 21 | 5.6 | Bright |
| 22 | 5.6 | Bright |
| 23 | 5.6 | Bright |
| 24 | 5.5 | Bright |
| 25 | 5.5 | Bright |
| 26 | 5.5 | Bright |
| 27 | 5.4 | Bright |
| 28 | 5.4 | Bright |
| 29 | 5.4 | Bright |
| 30 | 5.3 | Bright |
| 31 | 5.3 | Bright |
Is August a good time to visit Upper Alton?
Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
August is a reasonable time to visit Upper Alton for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Upper Alton in August
From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In August, Upper Alton sees daytime highs around 85°F and nights near 67°F. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.
UV index in Upper Alton in August
Clear-sky midday UV in August 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 Upper Alton peaks around June 21 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (low).
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) | 2 | 3 | 5 | 7 | 8 | 9 | 9 | 8 | 7 | 4 | 3 | 2 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 7 | High |
| Oct | 4 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Upper Alton in August
Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.
Air quality in Upper Alton is worst in August — around 18 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 8 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 10 | 13 | 13 | 11 | 14 | 16 | 18 | 18 | 13 | 8 | 9 | 10 |
| Level | Good | Moderate | Moderate | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 13 | Moderate |
| Mar | 13 | Moderate |
| Apr | 11 | Good |
| May | 14 | Moderate |
| Jun | 16 | Moderate |
| Jul | 18 | Moderate |
| Aug | 18 | Moderate |
| Sep | 13 | Moderate |
| Oct | 8 | Good |
| Nov | 9 | Good |
| Dec | 10 | Good |
Where is Upper Alton?
Upper Alton sits at 38.9°N, 90.2°W, 545 ft above sea level, in United States. The nearest listed city is Alton, 2.5 mi away.
Topography around Upper Alton
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Upper Alton.
Within 2 miles, the terrain around Upper Alton has only modest variations in elevation — a maximum elevation change of 249 ft around an average of 518 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 620 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 751 ft.
The land around Upper Alton is covered by trees (55%) and artificial surfaces (22%) within 2 miles, trees (41%) and cropland (32%) within 10 miles, and cropland (49%) and trees (37%) 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 Upper Alton (38.9114°, -90.1507°, elevation 545 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).