Greater Upper Marlboro weather in April
In April, Greater Upper Marlboro sees average daytime highs of 66°F and overnight lows near 49°F, with 3.4 in of precipitation across 10 wet days and about 13 hours of daylight. It is the 7th-warmest and 9th-wettest month of the year here.
Highs climb over the month, from about 61°F in the first days to 69°F by the end. The sky is clear or mostly clear about 30% of the time in April, and the air most often feels dry.
Daylight stretches from about 12 h 24 min at the start of April to 13 h 36 min by month's end. Set against the rest of the year, April is Greater Upper Marlboro's 9th-clearest and 4th-windiest month. For the whole year in context, see Greater Upper Marlboro's year-round climate.
- Daytime high
- 66°
- 7th warmest
- Overnight low
- 49°
- 6th coldest
- Precipitation
- 3.4 in
- 10 wet days
- Daylight
- 13 hours
- 5:37 AM – 6:38 PM
- Cloud cover
- 60%
- 9th clearest
- Wind
- 8 mph
- 4th windiest
- Solar energy
- 5.24 kWh/m²
- Travel score
- 5.9
- out of 10
Greater Upper Marlboro is census designated place in Maryland until 2010.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in April
Highs climb over the month, from about 61°F in the first days to 69°F by the end.
A typical April day in Greater Upper Marlboro reaches about 66°F in the afternoon and slips back to 49°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 53°F and 79°F. Set against its neighbours, April runs about 11°F warmer than March and about 8°F cooler than May.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 60 | 61 | 61 | 62 | 62 | 63 | 63 | 64 | 64 | 64 | 65 | 65 | 65 | 65 | 66 | 66 | 66 | 67 | 67 | 67 | 67 | 68 | 68 | 68 | 69 | 69 | 69 | 69 | 69 | 70 |
| Avg low (°F) | 44 | 44 | 44 | 45 | 45 | 45 | 46 | 46 | 46 | 47 | 47 | 47 | 48 | 48 | 49 | 49 | 49 | 50 | 50 | 50 | 51 | 51 | 51 | 51 | 52 | 52 | 52 | 53 | 53 | 53 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 60 | 44 |
| 2 | 61 | 44 |
| 3 | 61 | 44 |
| 4 | 62 | 45 |
| 5 | 62 | 45 |
| 6 | 63 | 45 |
| 7 | 63 | 46 |
| 8 | 64 | 46 |
| 9 | 64 | 46 |
| 10 | 64 | 47 |
| 11 | 65 | 47 |
| 12 | 65 | 47 |
| 13 | 65 | 48 |
| 14 | 65 | 48 |
| 15 | 66 | 49 |
| 16 | 66 | 49 |
| 17 | 66 | 49 |
| 18 | 67 | 50 |
| 19 | 67 | 50 |
| 20 | 67 | 50 |
| 21 | 67 | 51 |
| 22 | 68 | 51 |
| 23 | 68 | 51 |
| 24 | 68 | 51 |
| 25 | 69 | 52 |
| 26 | 69 | 52 |
| 27 | 69 | 52 |
| 28 | 69 | 53 |
| 29 | 69 | 53 |
| 30 | 70 | 53 |
How April really feels in Greater Upper Marlboro
Once humidity and wind are folded in, April 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.
April sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Greater Upper Marlboro weather by month
How April compares with the rest of the year at a glance. April is the 7th-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 | 44° / 30° | 3.1 | 8.6 | 2.6 | 9.6 | 0.7 |
| Feb | 46° / 31° | 2.9 | 8.6 | 2.4 | 10.5 | 1.4 |
| Mar | 55° / 38° | 4.0 | 10.3 | 1.5 | 11.7 | 3.4 |
| Apr | 66° / 49° | 3.4 | 10 | 0.1 | 13 | 5.9 |
| May | 74° / 58° | 3.7 | 10.7 | 0 | 14.1 | 6.6 |
| Jun | 83° / 67° | 3.7 | 11 | 0 | 14.7 | 5.7 |
| Jul | 87° / 72° | 4.3 | 12.3 | 0 | 14.4 | 4.5 |
| Aug | 85° / 71° | 4.0 | 10.6 | 0 | 13.5 | 5.3 |
| Sep | 78° / 64° | 4.3 | 9.1 | 0 | 12.3 | 6.9 |
| Oct | 67° / 52° | 3.5 | 7.9 | 0 | 11 | 6.6 |
| Nov | 56° / 42° | 2.9 | 7.6 | 0.1 | 9.9 | 4.2 |
| Dec | 47° / 35° | 3.5 | 8.8 | 1.2 | 9.3 | 1.7 |
Cloud cover in April
The sky is clear or mostly clear about 30% of the time in April.
Beyond those clear spells, partly cloudy skies cover about 16% of April, with mostly cloudy or overcast conditions the remaining 54%.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 45 | 46 | 46 | 46 | 47 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 47 | 47 | 46 | 46 | 45 | 44 | 44 | 44 | 44 | 43 | 43 | 43 | 42 | 43 | 43 | 43 | 44 |
| Cloudier (%) | 55 | 54 | 54 | 54 | 53 | 52 | 52 | 52 | 52 | 52 | 52 | 52 | 52 | 53 | 53 | 54 | 54 | 55 | 56 | 56 | 56 | 56 | 57 | 57 | 57 | 58 | 57 | 57 | 57 | 56 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 45 | 55 |
| 2 | 46 | 54 |
| 3 | 46 | 54 |
| 4 | 46 | 54 |
| 5 | 47 | 53 |
| 6 | 48 | 52 |
| 7 | 48 | 52 |
| 8 | 48 | 52 |
| 9 | 48 | 52 |
| 10 | 48 | 52 |
| 11 | 48 | 52 |
| 12 | 48 | 52 |
| 13 | 48 | 52 |
| 14 | 47 | 53 |
| 15 | 47 | 53 |
| 16 | 46 | 54 |
| 17 | 46 | 54 |
| 18 | 45 | 55 |
| 19 | 44 | 56 |
| 20 | 44 | 56 |
| 21 | 44 | 56 |
| 22 | 44 | 56 |
| 23 | 43 | 57 |
| 24 | 43 | 57 |
| 25 | 43 | 57 |
| 26 | 42 | 58 |
| 27 | 43 | 57 |
| 28 | 43 | 57 |
| 29 | 43 | 57 |
| 30 | 44 | 56 |
Chance of precipitation in April
Greater Upper Marlboro gets around 3.4 in of rain and snow over 10 wet days in April. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 33% and peaks near 35% on the wettest days, and about 0 day brings snow.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 35 | 35 | 35 | 34 | 34 | 34 | 34 | 33 | 33 | 32 | 32 | 32 | 32 | 32 | 32 | 33 | 33 | 33 | 34 | 34 | 34 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 |
| Rain chance (%) | |
|---|---|
| 1 | 35 |
| 2 | 35 |
| 3 | 35 |
| 4 | 34 |
| 5 | 34 |
| 6 | 34 |
| 7 | 34 |
| 8 | 33 |
| 9 | 33 |
| 10 | 32 |
| 11 | 32 |
| 12 | 32 |
| 13 | 32 |
| 14 | 32 |
| 15 | 32 |
| 16 | 33 |
| 17 | 33 |
| 18 | 33 |
| 19 | 34 |
| 20 | 34 |
| 21 | 34 |
| 22 | 33 |
| 23 | 33 |
| 24 | 33 |
| 25 | 33 |
| 26 | 33 |
| 27 | 33 |
| 28 | 33 |
| 29 | 33 |
| 30 | 33 |
Humidity in April
Most of April feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, April lands in the dry band about 86% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 95 | 95 | 94 | 94 | 93 | 93 | 92 | 92 | 90 | 90 | 89 | 89 | 87 | 87 | 86 | 86 | 85 | 84 | 84 | 84 | 84 | 82 | 81 | 80 | 80 | 79 | 78 | 77 | 76 | 75 |
| Comfortable (%) | 4 | 4 | 5 | 5 | 6 | 6 | 7 | 7 | 8 | 8 | 9 | 9 | 10 | 10 | 11 | 11 | 11 | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 14 | 14 | 14 | 15 | 15 |
| Humid (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 6 | 6 | 6 | 7 | 8 | 8 | 9 |
| Muggy (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| 1 | 95 | 4 | 1 | 0 |
| 2 | 95 | 4 | 1 | 0 |
| 3 | 94 | 5 | 1 | 0 |
| 4 | 94 | 5 | 1 | 0 |
| 5 | 93 | 6 | 1 | 0 |
| 6 | 93 | 6 | 1 | 0 |
| 7 | 92 | 7 | 1 | 0 |
| 8 | 92 | 7 | 1 | 0 |
| 9 | 90 | 8 | 2 | 0 |
| 10 | 90 | 8 | 2 | 0 |
| 11 | 89 | 9 | 2 | 0 |
| 12 | 89 | 9 | 2 | 0 |
| 13 | 87 | 10 | 3 | 0 |
| 14 | 87 | 10 | 3 | 0 |
| 15 | 86 | 11 | 3 | 0 |
| 16 | 86 | 11 | 3 | 0 |
| 17 | 85 | 11 | 4 | 0 |
| 18 | 84 | 12 | 4 | 0 |
| 19 | 84 | 12 | 4 | 0 |
| 20 | 84 | 12 | 4 | 0 |
| 21 | 84 | 12 | 4 | 0 |
| 22 | 82 | 12 | 5 | 1 |
| 23 | 81 | 13 | 5 | 1 |
| 24 | 80 | 13 | 6 | 1 |
| 25 | 80 | 13 | 6 | 1 |
| 26 | 79 | 14 | 6 | 1 |
| 27 | 78 | 14 | 7 | 1 |
| 28 | 77 | 14 | 8 | 1 |
| 29 | 76 | 15 | 8 | 1 |
| 30 | 75 | 15 | 9 | 1 |
Wind in April
Winds average 8 mph in April.
Across April, daily wind ranges from about 7 mph on the calmest days to 8 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 8 | light breeze |
| 2 | 8 | light breeze |
| 3 | 8 | light breeze |
| 4 | 8 | light breeze |
| 5 | 8 | light breeze |
| 6 | 8 | light breeze |
| 7 | 8 | light breeze |
| 8 | 8 | light breeze |
| 9 | 8 | light breeze |
| 10 | 8 | light breeze |
| 11 | 8 | light breeze |
| 12 | 8 | light breeze |
| 13 | 8 | light breeze |
| 14 | 8 | light breeze |
| 15 | 8 | light breeze |
| 16 | 8 | light breeze |
| 17 | 8 | light breeze |
| 18 | 7 | light breeze |
| 19 | 7 | calm |
| 20 | 7 | calm |
| 21 | 7 | calm |
| 22 | 7 | calm |
| 23 | 7 | calm |
| 24 | 7 | calm |
| 25 | 7 | calm |
| 26 | 7 | calm |
| 27 | 7 | calm |
| 28 | 7 | calm |
| 29 | 7 | calm |
| 30 | 7 | calm |
Sunrise & sunset in April
Daylight runs from about 12 h 24 min at the start of April to 13 h 36 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 72 minutes over April. Sunrise moves from 6:00 AM to 5:17 AM, and sunset from 6:23 PM to 6:51 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.4 | 12.4 | 12.5 | 12.5 | 12.5 | 12.6 | 12.6 | 12.7 | 12.7 | 12.8 | 12.8 | 12.8 | 12.9 | 12.9 | 13.0 | 13.0 | 13.1 | 13.1 | 13.1 | 13.2 | 13.2 | 13.3 | 13.3 | 13.3 | 13.4 | 13.4 | 13.5 | 13.5 | 13.5 | 13.6 |
| Sunrise (AM) | 6:00 | 5:59 | 5:57 | 5:55 | 5:54 | 5:52 | 5:51 | 5:49 | 5:48 | 5:46 | 5:44 | 5:43 | 5:41 | 5:40 | 5:38 | 5:37 | 5:35 | 5:34 | 5:32 | 5:31 | 5:30 | 5:28 | 5:27 | 5:25 | 5:24 | 5:23 | 5:21 | 5:20 | 5:19 | 5:17 |
| Sunset (PM) | 6:23 | 6:24 | 6:25 | 6:26 | 6:27 | 6:28 | 6:29 | 6:30 | 6:31 | 6:32 | 6:33 | 6:34 | 6:35 | 6:36 | 6:37 | 6:38 | 6:39 | 6:40 | 6:41 | 6:41 | 6:42 | 6:43 | 6:44 | 6:45 | 6:46 | 6:47 | 6:48 | 6:49 | 6:50 | 6:51 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.4 | 6:00 | 6:23 |
| 2 | 12.4 | 5:59 | 6:24 |
| 3 | 12.5 | 5:57 | 6:25 |
| 4 | 12.5 | 5:55 | 6:26 |
| 5 | 12.5 | 5:54 | 6:27 |
| 6 | 12.6 | 5:52 | 6:28 |
| 7 | 12.6 | 5:51 | 6:29 |
| 8 | 12.7 | 5:49 | 6:30 |
| 9 | 12.7 | 5:48 | 6:31 |
| 10 | 12.8 | 5:46 | 6:32 |
| 11 | 12.8 | 5:44 | 6:33 |
| 12 | 12.8 | 5:43 | 6:34 |
| 13 | 12.9 | 5:41 | 6:35 |
| 14 | 12.9 | 5:40 | 6:36 |
| 15 | 13.0 | 5:38 | 6:37 |
| 16 | 13.0 | 5:37 | 6:38 |
| 17 | 13.1 | 5:35 | 6:39 |
| 18 | 13.1 | 5:34 | 6:40 |
| 19 | 13.1 | 5:32 | 6:41 |
| 20 | 13.2 | 5:31 | 6:41 |
| 21 | 13.2 | 5:30 | 6:42 |
| 22 | 13.3 | 5:28 | 6:43 |
| 23 | 13.3 | 5:27 | 6:44 |
| 24 | 13.3 | 5:25 | 6:45 |
| 25 | 13.4 | 5:24 | 6:46 |
| 26 | 13.4 | 5:23 | 6:47 |
| 27 | 13.5 | 5:21 | 6:48 |
| 28 | 13.5 | 5:20 | 6:49 |
| 29 | 13.5 | 5:19 | 6:50 |
| 30 | 13.6 | 5:17 | 6:51 |
Solar energy in April
Average shortwave solar energy reaching the ground each day in April, about 5.24 kWh/m².
For context, solar energy here swings from a low near 1.98 kWh/m² to a high of 6.16 kWh/m² in June across the year — April's 5.24 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.7 | 4.8 | 4.8 | 4.9 | 4.9 | 5.0 | 5.0 | 5.0 | 5.1 | 5.1 | 5.1 | 5.2 | 5.2 | 5.2 | 5.2 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.4 | 5.4 | 5.4 | 5.4 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 |
| 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 | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.7 | Bright |
| 2 | 4.8 | Bright |
| 3 | 4.8 | Bright |
| 4 | 4.9 | Bright |
| 5 | 4.9 | Bright |
| 6 | 5.0 | Bright |
| 7 | 5.0 | Bright |
| 8 | 5.0 | Bright |
| 9 | 5.1 | Bright |
| 10 | 5.1 | Bright |
| 11 | 5.1 | Bright |
| 12 | 5.2 | Bright |
| 13 | 5.2 | Bright |
| 14 | 5.2 | Bright |
| 15 | 5.2 | Bright |
| 16 | 5.3 | Bright |
| 17 | 5.3 | Bright |
| 18 | 5.3 | Bright |
| 19 | 5.3 | Bright |
| 20 | 5.3 | Bright |
| 21 | 5.3 | Bright |
| 22 | 5.4 | Bright |
| 23 | 5.4 | Bright |
| 24 | 5.4 | Bright |
| 25 | 5.4 | Bright |
| 26 | 5.5 | Bright |
| 27 | 5.5 | Bright |
| 28 | 5.5 | Bright |
| 29 | 5.5 | Bright |
| 30 | 5.5 | Bright |
Hazard calendar for Greater Upper Marlboro
None of Greater Upper Marlboro's seasonal hazards are active in April. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Greater Upper Marlboro sits in the Atlantic hurricane belt; the season peaks August–October.
Is April a good time to visit Greater Upper Marlboro?
Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
April is a reasonable time to visit Greater Upper Marlboro for sightseeing.
What to pack for Greater Upper Marlboro in April
From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In April, Greater Upper Marlboro sees daytime highs around 66°F and nights near 49°F. Worth packing: rain gear and sun protection. About 10 days see rain.
Sea temperature near Greater Upper Marlboro in April
The nearest coast averages about 47°F in April — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 21 mi away) is warmest in August at about 78°F and coldest in February near 37°F.
It's comfortable for a long swim from Jun 16 to Oct 6 — about 3.7 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 38 | 37 | 40 | 47 | 58 | 68 | 76 | 78 | 74 | 65 | 54 | 45 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Refreshing | Warm | Warm | Refreshing | Cool | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 38 | Bracing |
| Feb | 37 | Bracing |
| Mar | 40 | Bracing |
| Apr | 47 | Bracing |
| May | 58 | Bracing |
| Jun | 68 | Refreshing |
| Jul | 76 | Warm |
| Aug | 78 | Warm |
| Sep | 74 | Refreshing |
| Oct | 65 | Cool |
| Nov | 54 | Bracing |
| Dec | 45 | Bracing |
UV index in Greater Upper Marlboro in April
Clear-sky midday UV in April peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Greater Upper Marlboro peaks around July 11 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 7 | 6 | 4 | 3 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Very high | High | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 7 | High |
| Sep | 6 | High |
| Oct | 4 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Greater Upper Marlboro in April
Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.
Air quality in Greater Upper Marlboro is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 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 | 12 | 13 | 13 | 15 | 16 | 17 | 14 | 12 | 9 | 8 | 10 |
| Level | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 12 | Good |
| Mar | 13 | Moderate |
| Apr | 13 | Moderate |
| May | 15 | Moderate |
| Jun | 16 | Moderate |
| Jul | 17 | Moderate |
| Aug | 14 | Moderate |
| Sep | 12 | Good |
| Oct | 9 | Good |
| Nov | 8 | Good |
| Dec | 10 | Good |
Where is Greater Upper Marlboro?
Greater Upper Marlboro sits at 38.8°N, 76.7°W, 79 ft above sea level, in United States. The nearest listed city is Bowie, 7.5 mi away.
Topography around Greater Upper Marlboro
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Greater Upper Marlboro.
Within 2 miles, the terrain around Greater Upper Marlboro has only modest variations in elevation — a maximum elevation change of 276 ft around an average of 115 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 341 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,434 ft.
The land around Greater Upper Marlboro is covered by trees (75%) within 2 miles, trees (68%) within 10 miles, and trees (55%) and water (21%) 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 Greater Upper Marlboro (38.8314°, -76.7483°, elevation 79 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).