Saint Peters weather in May
In May, Saint Peters sees average daytime highs of 75°F and overnight lows near 57°F, with 4.9 in of rain across 13.3 wet days and about 14.1 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.
Highs climb over the month, from about 71°F in the first days to 79°F by the end. The sky is clear or mostly clear about 29% 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 Saint Peters's 8th-clearest and 8th-windiest month. For the whole year in context, see Saint Peters's year-round climate.
- Daytime high
- 75°
- 5th warmest
- Overnight low
- 57°
- 8th coldest
- Rainfall
- 4.9 in
- 13.3 wet days
- Daylight
- 14 h 06 min
- 4:55 AM – 7:02 PM
- Cloud cover
- 62%
- 8th clearest
- Wind
- 7 mph
- 8th windiest
- Solar energy
- 5.79 kWh/m²
- Travel score
- 6.3
- out of 10
Saint Peters is city in Missouri.
- Density
- 908/km²
- people per km²
- Founded
- 1910
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in May
Highs climb over the month, from about 71°F in the first days to 79°F by the end.
A typical May day in Saint Peters reaches about 75°F in the afternoon and slips back to 57°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 63°F and 86°F. Set against its neighbours, May runs about 9°F warmer than April and about 9°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) | 70 | 71 | 71 | 71 | 72 | 72 | 72 | 73 | 73 | 73 | 74 | 74 | 74 | 74 | 75 | 75 | 75 | 76 | 76 | 76 | 76 | 77 | 77 | 77 | 78 | 78 | 78 | 79 | 79 | 79 | 80 |
| Avg low (°F) | 52 | 52 | 53 | 53 | 54 | 54 | 54 | 55 | 55 | 55 | 56 | 56 | 56 | 56 | 57 | 57 | 58 | 58 | 58 | 58 | 59 | 59 | 60 | 60 | 60 | 61 | 61 | 61 | 62 | 62 | 62 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 70 | 52 |
| 2 | 71 | 52 |
| 3 | 71 | 53 |
| 4 | 71 | 53 |
| 5 | 72 | 54 |
| 6 | 72 | 54 |
| 7 | 72 | 54 |
| 8 | 73 | 55 |
| 9 | 73 | 55 |
| 10 | 73 | 55 |
| 11 | 74 | 56 |
| 12 | 74 | 56 |
| 13 | 74 | 56 |
| 14 | 74 | 56 |
| 15 | 75 | 57 |
| 16 | 75 | 57 |
| 17 | 75 | 58 |
| 18 | 76 | 58 |
| 19 | 76 | 58 |
| 20 | 76 | 58 |
| 21 | 76 | 59 |
| 22 | 77 | 59 |
| 23 | 77 | 60 |
| 24 | 77 | 60 |
| 25 | 78 | 60 |
| 26 | 78 | 61 |
| 27 | 78 | 61 |
| 28 | 79 | 61 |
| 29 | 79 | 62 |
| 30 | 79 | 62 |
| 31 | 80 | 62 |
How May really feels in Saint Peters
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.
Saint Peters weather by month
How May compares with the rest of the year at a glance. May is the 5th-warmest and 1st-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 40° / 24° | 2.5 | 7.7 | 3 | 9.6 | 0.0 |
| Feb | 44° / 28° | 2.4 | 7.6 | 2.9 | 10.5 | 0.8 |
| Mar | 55° / 37° | 3.6 | 10.6 | 1.4 | 11.7 | 3.5 |
| Apr | 66° / 47° | 4.5 | 11.3 | 0.2 | 13 | 5.8 |
| May | 75° / 57° | 4.9 | 13.3 | 0 | 14.1 | 6.3 |
| Jun | 84° / 66° | 4.0 | 11.1 | 0 | 14.7 | 5.5 |
| Jul | 87° / 70° | 3.2 | 9.9 | 0 | 14.4 | 4.6 |
| Aug | 86° / 67° | 3.0 | 9.2 | 0 | 13.5 | 5.2 |
| Sep | 79° / 59° | 3.2 | 7.6 | 0 | 12.3 | 7.1 |
| Oct | 67° / 48° | 3.3 | 8.5 | 0 | 11 | 6.6 |
| Nov | 54° / 37° | 3.5 | 8.3 | 0.8 | 9.9 | 3.5 |
| Dec | 43° / 28° | 2.4 | 7.7 | 2.2 | 9.3 | 0.6 |
Cloud cover in May
The sky is clear or mostly clear about 29% of the time in May.
Beyond those clear spells, partly cloudy skies cover about 14% of May, with mostly cloudy or overcast conditions the remaining 57%.
| 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 (%) | 42 | 41 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 44 | 44 | 43 | 44 | 43 | 44 | 43 | 42 | 44 | 43 | 44 | 43 | 43 | 44 | 44 |
| Cloudier (%) | 58 | 59 | 58 | 58 | 58 | 58 | 58 | 58 | 58 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 56 | 56 | 57 | 56 | 57 | 56 | 57 | 58 | 56 | 57 | 56 | 57 | 57 | 56 | 56 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 42 | 58 |
| 2 | 41 | 59 |
| 3 | 42 | 58 |
| 4 | 42 | 58 |
| 5 | 42 | 58 |
| 6 | 42 | 58 |
| 7 | 42 | 58 |
| 8 | 42 | 58 |
| 9 | 42 | 58 |
| 10 | 43 | 57 |
| 11 | 43 | 57 |
| 12 | 43 | 57 |
| 13 | 43 | 57 |
| 14 | 43 | 57 |
| 15 | 43 | 57 |
| 16 | 43 | 57 |
| 17 | 44 | 56 |
| 18 | 44 | 56 |
| 19 | 43 | 57 |
| 20 | 44 | 56 |
| 21 | 43 | 57 |
| 22 | 44 | 56 |
| 23 | 43 | 57 |
| 24 | 42 | 58 |
| 25 | 44 | 56 |
| 26 | 43 | 57 |
| 27 | 44 | 56 |
| 28 | 43 | 57 |
| 29 | 43 | 57 |
| 30 | 44 | 56 |
| 31 | 44 | 56 |
Chance of precipitation in May
Saint Peters gets around 4.9 in of rain over 13.3 wet days in May, the wettest month. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 43% and peaks near 45% 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 (%) | 45 | 45 | 45 | 44 | 44 | 44 | 43 | 43 | 42 | 42 | 42 | 41 | 41 | 41 | 41 | 41 | 42 | 42 | 42 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 42 | 42 | 42 | 41 | 41 |
| Rain chance (%) | |
|---|---|
| 1 | 45 |
| 2 | 45 |
| 3 | 45 |
| 4 | 44 |
| 5 | 44 |
| 6 | 44 |
| 7 | 43 |
| 8 | 43 |
| 9 | 42 |
| 10 | 42 |
| 11 | 42 |
| 12 | 41 |
| 13 | 41 |
| 14 | 41 |
| 15 | 41 |
| 16 | 41 |
| 17 | 42 |
| 18 | 42 |
| 19 | 42 |
| 20 | 43 |
| 21 | 43 |
| 22 | 43 |
| 23 | 43 |
| 24 | 43 |
| 25 | 43 |
| 26 | 43 |
| 27 | 42 |
| 28 | 42 |
| 29 | 42 |
| 30 | 41 |
| 31 | 41 |
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 48% of days. Sticky, muggy-or-worse air turns up on roughly 17% 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 (%) | 70 | 67 | 66 | 63 | 62 | 60 | 58 | 57 | 56 | 55 | 54 | 54 | 52 | 52 | 50 | 49 | 48 | 47 | 46 | 44 | 42 | 41 | 39 | 37 | 36 | 34 | 32 | 31 | 29 | 28 | 26 |
| Comfortable (%) | 18 | 19 | 19 | 20 | 20 | 20 | 20 | 19 | 19 | 18 | 18 | 17 | 17 | 16 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 15 | 16 | 16 | 17 | 18 | 18 | 19 |
| Humid (%) | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 17 | 18 | 19 | 19 | 20 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 |
| Muggy (%) | 2 | 3 | 3 | 4 | 4 | 5 | 6 | 7 | 8 | 9 | 9 | 10 | 11 | 12 | 14 | 15 | 16 | 17 | 19 | 20 | 22 | 23 | 24 | 25 | 26 | 26 | 27 | 28 | 29 | 29 | 30 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 4 | 4 | 4 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 70 | 18 | 10 | 2 | 0 |
| 2 | 67 | 19 | 11 | 3 | 0 |
| 3 | 66 | 19 | 12 | 3 | 0 |
| 4 | 63 | 20 | 13 | 4 | 0 |
| 5 | 62 | 20 | 14 | 4 | 0 |
| 6 | 60 | 20 | 15 | 5 | 0 |
| 7 | 58 | 20 | 16 | 6 | 0 |
| 8 | 57 | 19 | 17 | 7 | 0 |
| 9 | 56 | 19 | 17 | 8 | 0 |
| 10 | 55 | 18 | 18 | 9 | 0 |
| 11 | 54 | 18 | 19 | 9 | 0 |
| 12 | 54 | 17 | 19 | 10 | 0 |
| 13 | 52 | 17 | 20 | 11 | 0 |
| 14 | 52 | 16 | 20 | 12 | 0 |
| 15 | 50 | 15 | 20 | 14 | 1 |
| 16 | 49 | 15 | 20 | 15 | 1 |
| 17 | 48 | 14 | 21 | 16 | 1 |
| 18 | 47 | 14 | 21 | 17 | 1 |
| 19 | 46 | 14 | 21 | 19 | 1 |
| 20 | 44 | 14 | 21 | 20 | 1 |
| 21 | 42 | 14 | 21 | 22 | 1 |
| 22 | 41 | 14 | 21 | 23 | 2 |
| 23 | 39 | 14 | 21 | 24 | 2 |
| 24 | 37 | 14 | 21 | 25 | 2 |
| 25 | 36 | 15 | 21 | 26 | 2 |
| 26 | 34 | 16 | 21 | 26 | 3 |
| 27 | 32 | 16 | 21 | 27 | 3 |
| 28 | 31 | 17 | 21 | 28 | 3 |
| 29 | 29 | 18 | 21 | 29 | 4 |
| 30 | 28 | 18 | 21 | 29 | 4 |
| 31 | 26 | 19 | 21 | 30 | 4 |
Wind in May
Winds average 7 mph in May.
Across May, daily wind ranges from about 6 mph on the calmest days to 7 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) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 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 | 7 | calm |
| 2 | 7 | calm |
| 3 | 7 | calm |
| 4 | 7 | calm |
| 5 | 7 | calm |
| 6 | 7 | calm |
| 7 | 7 | calm |
| 8 | 7 | calm |
| 9 | 7 | calm |
| 10 | 7 | calm |
| 11 | 7 | calm |
| 12 | 7 | calm |
| 13 | 7 | calm |
| 14 | 7 | calm |
| 15 | 7 | calm |
| 16 | 7 | calm |
| 17 | 7 | calm |
| 18 | 7 | calm |
| 19 | 7 | calm |
| 20 | 7 | calm |
| 21 | 7 | 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 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 5:12 AM to 4:45 AM, and sunset from 6:48 PM to 7:15 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 | 13.6 | 13.7 | 13.7 | 13.7 | 13.8 | 13.8 | 13.9 | 13.9 | 13.9 | 14.0 | 14.0 | 14.0 | 14.0 | 14.1 | 14.1 | 14.1 | 14.2 | 14.2 | 14.2 | 14.3 | 14.3 | 14.3 | 14.3 | 14.4 | 14.4 | 14.4 | 14.4 | 14.4 | 14.5 | 14.5 |
| Sunrise (AM) | 5:12 | 5:10 | 5:09 | 5:08 | 5:07 | 5:06 | 5:05 | 5:03 | 5:02 | 5:01 | 5:00 | 4:59 | 4:58 | 4:57 | 4:56 | 4:55 | 4:55 | 4:54 | 4:53 | 4:52 | 4:51 | 4:51 | 4:50 | 4:49 | 4:49 | 4:48 | 4:47 | 4:47 | 4:46 | 4:46 | 4:45 |
| Sunset (PM) | 6:48 | 6:49 | 6:50 | 6:51 | 6:52 | 6:53 | 6:54 | 6:54 | 6:55 | 6:56 | 6:57 | 6:58 | 6:59 | 7:00 | 7:01 | 7:02 | 7:03 | 7:04 | 7:05 | 7:06 | 7:06 | 7:07 | 7:08 | 7:09 | 7:10 | 7:11 | 7:11 | 7:12 | 7:13 | 7:14 | 7:15 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.6 | 5:12 | 6:48 |
| 2 | 13.6 | 5:10 | 6:49 |
| 3 | 13.7 | 5:09 | 6:50 |
| 4 | 13.7 | 5:08 | 6:51 |
| 5 | 13.7 | 5:07 | 6:52 |
| 6 | 13.8 | 5:06 | 6:53 |
| 7 | 13.8 | 5:05 | 6:54 |
| 8 | 13.9 | 5:03 | 6:54 |
| 9 | 13.9 | 5:02 | 6:55 |
| 10 | 13.9 | 5:01 | 6:56 |
| 11 | 14.0 | 5:00 | 6:57 |
| 12 | 14.0 | 4:59 | 6:58 |
| 13 | 14.0 | 4:58 | 6:59 |
| 14 | 14.0 | 4:57 | 7:00 |
| 15 | 14.1 | 4:56 | 7:01 |
| 16 | 14.1 | 4:55 | 7:02 |
| 17 | 14.1 | 4:55 | 7:03 |
| 18 | 14.2 | 4:54 | 7:04 |
| 19 | 14.2 | 4:53 | 7:05 |
| 20 | 14.2 | 4:52 | 7:06 |
| 21 | 14.3 | 4:51 | 7:06 |
| 22 | 14.3 | 4:51 | 7:07 |
| 23 | 14.3 | 4:50 | 7:08 |
| 24 | 14.3 | 4:49 | 7:09 |
| 25 | 14.4 | 4:49 | 7:10 |
| 26 | 14.4 | 4:48 | 7:11 |
| 27 | 14.4 | 4:47 | 7:11 |
| 28 | 14.4 | 4:47 | 7:12 |
| 29 | 14.4 | 4:46 | 7:13 |
| 30 | 14.5 | 4:46 | 7:14 |
| 31 | 14.5 | 4:45 | 7:15 |
Solar energy in May
Average shortwave solar energy reaching the ground each day in May, about 5.79 kWh/m².
For context, solar energy here swings from a low near 1.92 kWh/m² to a high of 6.42 kWh/m² in June across the year — May's 5.79 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) | 5.3 | 5.4 | 5.4 | 5.4 | 5.5 | 5.5 | 5.5 | 5.6 | 5.6 | 5.7 | 5.7 | 5.7 | 5.8 | 5.8 | 5.8 | 5.8 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.1 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.3 | Bright |
| 2 | 5.4 | Bright |
| 3 | 5.4 | Bright |
| 4 | 5.4 | Bright |
| 5 | 5.5 | Bright |
| 6 | 5.5 | Bright |
| 7 | 5.5 | Bright |
| 8 | 5.6 | Bright |
| 9 | 5.6 | Bright |
| 10 | 5.7 | Bright |
| 11 | 5.7 | Bright |
| 12 | 5.7 | Bright |
| 13 | 5.8 | Bright |
| 14 | 5.8 | Bright |
| 15 | 5.8 | Bright |
| 16 | 5.8 | Bright |
| 17 | 5.9 | Bright |
| 18 | 5.9 | Bright |
| 19 | 5.9 | Bright |
| 20 | 5.9 | Bright |
| 21 | 5.9 | Bright |
| 22 | 6.0 | Bright |
| 23 | 6.0 | Bright |
| 24 | 6.0 | Bright |
| 25 | 6.0 | Bright |
| 26 | 6.0 | Intense |
| 27 | 6.0 | Intense |
| 28 | 6.0 | Intense |
| 29 | 6.0 | Intense |
| 30 | 6.0 | Intense |
| 31 | 6.1 | Intense |
Is May a good time to visit Saint Peters?
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 Saint Peters for sightseeing.
What to pack for Saint Peters in May
From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In May, Saint Peters sees daytime highs around 75°F and nights near 57°F. Worth packing: light clothes, rain gear and sun protection. About 13 days see rain.
UV index in Saint Peters in May
Clear-sky midday UV in May peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Saint Peters peaks around June 22 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 Saint Peters in May
Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.
Air quality in Saint Peters is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (October, 7 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) | 9 | 11 | 11 | 10 | 13 | 14 | 17 | 14 | 11 | 7 | 7 | 8 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 11 | Good |
| Mar | 11 | Good |
| Apr | 10 | Good |
| May | 13 | Moderate |
| Jun | 14 | Moderate |
| Jul | 17 | Moderate |
| Aug | 14 | Moderate |
| Sep | 11 | Good |
| Oct | 7 | Good |
| Nov | 7 | Good |
| Dec | 8 | Good |
Where is Saint Peters?
Saint Peters sits at 38.8°N, 90.6°W, 440 ft above sea level, in United States. The nearest listed city is O'Fallon, 3.7 mi away.
Topography around Saint Peters
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Saint Peters.
Within 2 miles, the terrain around Saint Peters has only modest variations in elevation — a maximum elevation change of 167 ft around an average of 469 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 469 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 978 ft.
The land around Saint Peters is covered by artificial surfaces (32%), trees (26%) and cropland (26%) within 2 miles, trees (36%) and cropland (27%) within 10 miles, and trees (51%) and cropland (32%) 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 Saint Peters (38.8003°, -90.6265°, elevation 440 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).