The most pleasant months of the year for the 21155 zip code are September, May and June. In the 21155 zip code, there are 4 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for the 21155 zip code with an average high temperature of 86.3°, which ranks it as cooler than most places in Maryland. February is the snowiest month in the 21155 zip code with 9.3 inches of snow, and 5 months of the year have significant snowfall. July is the most humid month, though humidity is low for most of the year.
Today's Weather - Upperco, MD
4 PM PST
Partly Cloudy
72°F
| 7 DAY FORECAST | DESCRIPTION | HIGH/LOW | WIND |
|---|
| Tonight | Partly Cloudy | 49° / 73° | E 3 to 7 mph |
| Sunday Night | Slight Chance Rain Showers | 55° / 77° | E 7 mph |
| Monday Night | Chance Showers And Thunderstorms | 55° / 72° | E 13 mph |
| Tuesday Night | Chance Rain Showers | 53° / 76° | E 7 to 12 mph |
| Wednesday Night | Slight Chance Rain Showers then Partly Cloudy | 57° / 87° | SW 7 mph |
| Thursday Night | Mostly Clear | 61° / 90° | W 7 mph |
| Friday Night | Partly Cloudy | 61° / 85° | N 9 mph |
Weather Highlights
Summer High: the July high is around 86 degrees
Winter Low: the January low is 21
Rain: averages 43 inches of rain a year
Snow: averages 27 inches of snow a year
BESTPLACES COMFORT INDEX
The annual BestPlaces Comfort Index for the Upperco (zip 21155) area is 8.6 (10=best), which means it is more comfortable than most places in Maryland.
8.6 / 10
A higher score indicates a more comfortable year-round climate. The US average for the comfort index is 7.8. Our index is based on the total number of days annually within the comfort range of 70-80 degrees, and we also applied a penalty for days of excessive humidity.
Average Monthly High and Low (°F)
| High | Low |
| January | 39° | 21° |
| February | 43° | 23° |
| March | 52° | 30° |
| April | 64° | 39° |
| May | 74° | 49° |
| June | 82° | 59° |
| July | 86° | 63° |
| August | 85° | 61° |
| September | 77° | 54° |
| October | 66° | 43° |
| November | 55° | 34° |
| December | 43° | 25° |
Hot, Freezing, Rainy, Snowy Days: Upperco
| Hot
Days | Freezing
Days | Rainy
Days | Snowy
Days |
| January | 0 | 27 | 10 | 4 |
| February | 0 | 23 | 9 | 3 |
| March | 0 | 18 | 11 | 2 |
| April | 0 | 6 | 12 | 0 |
| May | 1 | 0 | 13 | 0 |
| June | 4 | 0 | 11 | 0 |
| July | 8 | 0 | 11 | 0 |
| August | 5 | 0 | 9 | 0 |
| September | 1 | 0 | 9 | 0 |
| October | 0 | 3 | 8 | 0 |
| November | 0 | 13 | 9 | 0 |
| December | 0 | 24 | 10 | 2 |
YOU SHOULD KNOW
Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.
Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.
Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.