Average Weather in Rosedale Maryland, United States
In Rosedale, the summers are warm and humid; the winters are very cold, wet, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 28°F to 87°F and is rarely below 16°F or above 94°F.
Based on the tourism score, the best time of year to visit Rosedale for warm-weather activities is from mid August to early October.
The hot season lasts for 3.5 months, from May 30 to September 16, with an average daily high temperature above 78°F. The hottest day of the year is July 21, with an average high of 87°F and low of 72°F.
The cold season lasts for 3.2 months, from December 1 to March 8, with an average daily high temperature below 51°F. The coldest day of the year is January 30, with an average low of 28°F and high of 41°F.
Average High and Low Temperature
Average Hourly Temperature
In Rosedale, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.
The clearer part of the year in Rosedale begins around June 29 and lasts for 4.5 months, ending around November 13. On September 23, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 65% of the time, and overcast or mostly cloudy 35% of the time.
The cloudier part of the year begins around November 13 and lasts for 7.5 months, ending around June 29. On January 5, the cloudiest day of the year, the sky is overcast or mostly cloudy 52% of the time, and clear, mostly clear, or partly cloudy 48% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Rosedale varies throughout the year.
The wetter season lasts 3.9 months, from April 27 to August 23, with a greater than 30% chance of a given day being a wet day. The chance of a wet day peaks at 38% on July 14.
The drier season lasts 8.1 months, from August 23 to April 27. The smallest chance of a wet day is 21% on October 20.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 38% on July 14.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Rosedale experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Rosedale. The most rain falls during the 31 days centered around September 27, with an average total accumulation of 3.6 inches.
The least rain falls around January 30, with an average total accumulation of 2.1 inches.
Average Monthly Rainfall
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Rosedale experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 3.9 months, from November 26 to March 22, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around February 4, with an average total liquid-equivalent accumulation of 0.6 inches.
The snowless period of the year lasts for 8.1 months, from March 22 to November 26. The least snow falls around July 15, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Rosedale varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 24 minutes of daylight; the longest day is June 21, with 14 hours, 57 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:38 AM on June 14, and the latest sunrise is 1 hour, 57 minutes later at 7:36 AM on November 3. The earliest sunset is at 4:42 PM on December 7, and the latest sunset is 3 hours, 54 minutes later at 8:36 PM on June 27.
Daylight saving time (DST) is observed in Rosedale during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
Rosedale experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 4.2 months, from May 23 to September 30, during which time the comfort level is muggy, oppressive, or miserable at least 16% of the time. The muggiest day of the year is August 2, with muggy conditions 66% of the time.
The least muggy day of the year is January 23, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Rosedale experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 6.6 months, from October 22 to May 8, with average wind speeds of more than 8.5 miles per hour. The windiest day of the year is February 26, with an average hourly wind speed of 10.7 miles per hour.
The calmer time of year lasts for 5.4 months, from May 8 to October 22. The calmest day of the year is August 1, with an average hourly wind speed of 6.4 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Rosedale varies throughout the year.
The wind is most often from the north for 3.7 weeks, from March 7 to April 2, with a peak percentage of 32% on March 12. The wind is most often from the west for 1.1 months, from April 2 to May 6; for 3.7 weeks, from June 27 to July 23; and for 4.9 months, from October 10 to March 7, with a peak percentage of 36% on July 7. The wind is most often from the south for 1.7 months, from May 6 to June 27 and for 2.6 months, from July 23 to October 10, with a peak percentage of 35% on August 16.
Rosedale is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average water temperature experiences significant seasonal variation over the course of the year.
The time of year with warmer water lasts for 3.4 months, from June 22 to October 1, with an average temperature above 68°F. The day of the year with the warmest water is August 12, with an average temperature of 76°F.
The time of year with cooler water lasts for 3.6 months, from December 19 to April 6, with an average temperature below 45°F. The day of the year with the coolest water is February 10, with an average temperature of 37°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Rosedale throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Rosedale for general outdoor tourist activities is from mid August to early October, with a peak score in the first week of September.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Rosedale for hot-weather activities is from late June to early September, with a peak score in the second week of August.
The growing season in Rosedale typically lasts for 7.7 months (236 days), from around March 27 to around November 18, rarely starting before March 9 or after April 13, and rarely ending before October 31 or after December 6.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Rosedale should appear around March 27, only rarely appearing before March 12 or after April 12.
Growing Degree Days
The average daily incident shortwave solar energy experiences significant seasonal variation over the course of the year.
The brighter period of the year lasts for 3.8 months, from April 28 to August 23, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is June 23, with an average of 6.9 kWh.
The darker period of the year lasts for 3.1 months, from November 6 to February 9, with an average daily incident shortwave energy per square meter below 2.9 kWh. The darkest day of the year is December 23, with an average of 1.9 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Rosedale are 39.320 deg latitude, -76.516 deg longitude, and 72 ft elevation.
The topography within 2 miles of Rosedale contains only modest variations in elevation, with a maximum elevation change of 184 feet and an average elevation above sea level of 66 feet. Within 10 miles contains only modest variations in elevation (538 feet). Within 50 miles contains significant variations in elevation (1,260 feet).
The area within 2 miles of Rosedale is covered by artificial surfaces (98%), within 10 miles by artificial surfaces (61%) and water (20%), and within 50 miles by cropland (41%) and trees (27%).
This report illustrates the typical weather in Rosedale, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Rosedale.
For each station, the records are corrected for the elevation difference between that station and Rosedale according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Rosedale is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Rosedale and a given station.
Time zones for aiports and weather stations are provided by AskGeo.com .