July weather forecastDumfries, VA
July
Weather in July
July is a hot summer month in Dumfries, Virginia, with an average temperature ranging between max 88.7°F (31.5°C) and min 67.8°F (19.9°C).Temperature
Dumfries experiences its highest average temperatures in July, reaching a peak of 88.7°F (31.5°C) and a minimum of 67.8°F (19.9°C).Heat index
During July, the heat index is computed to be a blistering 104°F (40°C). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.Given the heat index, its values are aligned with shaded sites and gentle winds. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', gauges the sensation of temperature factoring in the air's moisture content. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.
Humidity
January, April and July, with an average relative humidity of 73%, are the least humid months in Dumfries.Rainfall
In Dumfries, in July, it is raining for 15.9 days, with typically 3.19" (81mm) of accumulated precipitation. Throughout the year, in Dumfries, there are 155.6 rainfall days, and 31.61" (803mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In Dumfries, the average length of the day in July is 14h and 33min.On the first day of the month, sunrise is at 5:49 am and sunset at 8:37 pm. On the last day of July, sunrise is at 6:10 am and sunset at 8:20 pm EDT.
Sunshine
The month with the most sunshine in Dumfries is July, with an average of 10.5h of sunshine.UV index
The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 6 in July interprets into the following recommendations:
Deter overexposure. Protecting against the sun's effects is essential. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
Dumfries, VA
- Average high temperature in July: 88.7°F
The warmest month (with the highest average high temperature) is July (88.7°F).
The month with the lowest average high temperature is January (41.5°F).
- Average low temperature in July: 67.8°F
The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (27.5°F).
Average pressure in July
Dumfries, VA
- Average pressure in July: 29.97"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in July
Dumfries, VA
- Average wind speed in July: 4.8mph
The windiest months (with the highest average wind speed) are March and April (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in July
Dumfries, VA
- Average humidity in July: 73%
The months with the highest relative humidity are October and December (78%).
The months with the lowest relative humidity are January, April and July (73%).
Average rainfall in July
Dumfries, VA
- Average rainfall in July: 3.19"
The wettest month (with the highest rainfall) is August (3.66").
The driest month (with the least rainfall) is January (1.97").
Average rainfall days in July
Dumfries, VA
- Average rainfall days in July: 15.9 days
The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is November (8.7 days).
Average snowfall in July
Dumfries, VA
- Average snowfall in July: 0"
The month with the highest snowfall is January (2.52").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in July
Dumfries, VA
- Average snowfall days in July: 0 days
The month with the highest number of snowfall days is January (4.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in July /
Average sunshine in July
Dumfries, VA
- Average daylight in July: 14h and 30min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in July: 10h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The months with the least sunshine are February and December (Average sunshine: 5h and 6min).
Average sunshine days in July
Dumfries, VA
- Average sunshine days in July: 12.4 days
The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (11.5 days).
Average UV index in July
Dumfries, VA
- Average UV index in July: 6
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in July
Dumfries, VA
- Average cloud cover in July: 32
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in July
Dumfries, VA
- Average visibility in July: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
