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Climate and Average Weather Year Round at Marion / Wytheville Virginia, United States

At Marion / Wytheville, the summers are warm, the winters are very cold and snowy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 24°F to 83°F and is rarely below 9°F or above 89°F.

Based on the tourism score, the best time of year to visit Marion / Wytheville for warm-weather activities is from early June to mid September.

Climate at Marion / Wytheville

very coldcoldcoolwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow65%65%41%41%clearovercastprecipitation: 3.5 inprecipitation: 3.5 in2.5 in2.5 inmuggy: 35%muggy: 35%0%0%drydrytourism score: 6.6tourism score: 6.60.30.3
Marion / Wytheville weather by month. Click on each chart for more information.

The warm season lasts for 3.8 months, from May 24 to September 18, with an average daily high temperature above 75°F. The hottest month of the year at Marion / Wytheville is July, with an average high of 82°F and low of 63°F.

The cold season lasts for 3.0 months, from November 30 to February 28, with an average daily high temperature below 50°F. The coldest month of the year at Marion / Wytheville is January, with an average low of 25°F and high of 42°F.

Average High and Low Temperature at Marion / Wytheville

Average High and Low Temperature at Marion / WythevillewarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2242°FJan 2242°FJul 2083°FJul 2083°F24°F24°F64°F64°FMay 2475°FMay 2475°FSep 1875°FSep 1875°FNov 3050°FNov 3050°FFeb 2850°FFeb 2850°F54°F54°F54°F54°F31°F31°F30°F30°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 42°F46°F55°F65°F73°F80°F82°F82°F76°F66°F55°F46°F
Temp. 32°F35°F44°F53°F61°F69°F72°F71°F64°F54°F44°F36°F
Low 25°F27°F34°F43°F52°F60°F63°F62°F55°F44°F34°F28°F

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature at Marion / Wytheville

Average Hourly Temperature at Marion / WythevilleJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowfreezingvery coldvery coldcoldcoldcoolcomfortablecomfortablewarmfreezingfreezing
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Cardano al Campo, Italy (4,472 miles away) is the far-away foreign place with temperatures most similar to Marion / Wytheville (view comparison).

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At Marion / Wytheville, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year at Marion / Wytheville begins around June 17 and lasts for 4.9 months, ending around November 14.

The clearest month of the year at Marion / Wytheville is September, during which on average the sky is clear, mostly clear, or partly cloudy 63% of the time.

The cloudier part of the year begins around November 14 and lasts for 7.1 months, ending around June 17.

The cloudiest month of the year at Marion / Wytheville is January, during which on average the sky is overcast or mostly cloudy 57% of the time.

Cloud Cover Categories at Marion / Wytheville

Cloud Cover Categories at Marion / WythevilleclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 265%Sep 265%Jan 341%Jan 341%Jun 1753%Jun 1753%Nov 1453%Nov 1453%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 57%56%53%50%51%48%45%38%37%40%48%56%
Clearer 43%44%47%50%49%52%55%62%63%60%52%44%

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Marion / Wytheville varies throughout the year.

The wetter season lasts 4.5 months, from April 11 to August 27, with a greater than 32% chance of a given day being a wet day. The month with the most wet days at Marion / Wytheville is July, with an average of 13.8 days with at least 0.04 inches of precipitation.

The drier season lasts 7.5 months, from August 27 to April 11. The month with the fewest wet days at Marion / Wytheville is October, with an average of 6.4 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone at Marion / Wytheville is July, with an average of 13.8 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 46% on July 12.

Daily Chance of Precipitation at Marion / Wytheville

Daily Chance of Precipitation at Marion / WythevillewetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 1246%Jul 1246%Oct 2919%Oct 2919%Apr 1132%Apr 1132%Aug 2732%Aug 2732%NowNowrainmixed
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 4.9d5.0d8.2d9.6d12.2d12.4d13.8d11.3d8.1d6.4d6.2d6.0d
Mixed 1.5d1.6d0.8d0.2d0.0d0.0d0.0d0.0d0.0d0.0d0.3d1.2d
Snow 1.1d1.0d0.2d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.1d0.6d
Any 7.5d7.6d9.2d9.8d12.2d12.4d13.8d11.3d8.1d6.4d6.7d7.7d

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. Marion / Wytheville experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year at Marion / Wytheville. The month with the most rain at Marion / Wytheville is May, with an average rainfall of 3.5 inches.

The month with the least rain at Marion / Wytheville is February, with an average rainfall of 2.2 inches.

Average Monthly Rainfall at Marion / Wytheville

Average Monthly Rainfall at Marion / WythevilleJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 in7 in7 inMay 183.5 inMay 183.5 inJan 302.1 inJan 302.1 inJul 233.3 inJul 233.3 inSep 252.8 inSep 252.8 inNov 282.7 inNov 282.7 inNowNow
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 2.2″2.2″2.9″3.2″3.5″3.2″3.3″3.0″2.8″2.6″2.6″2.4″

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Marion / Wytheville experiences significant seasonal variation in monthly snowfall.

The snowy period of the year lasts for 4.4 months, from November 17 to March 29, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at Marion / Wytheville is February, with an average snowfall of 4.9 inches.

The snowless period of the year lasts for 7.6 months, from March 29 to November 17. The least snow falls around July 29, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall at Marion / Wytheville

Average Monthly Snowfall at Marion / WythevillesnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 inFeb 25.4 inFeb 25.4 inJul 290.0 inJul 290.0 inNov 171.0 inNov 171.0 inMar 291.0 inMar 291.0 in
The average snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Snowfall 4.6″4.9″1.8″0.4″0.0″0.0″0.0″0.0″0.0″0.1″0.9″3.1″

The length of the day at Marion / Wytheville varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 38 minutes of daylight; the longest day is June 20, with 14 hours, 42 minutes of daylight.

Hours of Daylight and Twilight at Marion / Wytheville

Hours of Daylight and Twilight at Marion / WythevilleJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 1912 hr, 7 minMar 1914 hr, 42 minJun 2014 hr, 42 minJun 2012 hr, 10 minSep 2212 hr, 10 minSep 229 hr, 38 minDec 219 hr, 38 minDec 21nightnightdayNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 10.0h10.9h12.0h13.2h14.2h14.7h14.4h13.5h12.4h11.2h10.2h9.7h

The earliest sunrise is at 6:05 AM on June 12, and the latest sunrise is 1 hour, 45 minutes later at 7:50 AM on November 2. The earliest sunset is at 5:08 PM on December 6, and the latest sunset is 3 hours, 40 minutes later at 8:48 PM on June 27.

Daylight saving time (DST) is observed at Marion / Wytheville during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

Sunrise & Sunset with Twilight and Daylight Saving Time at Marion / Wytheville

Sunrise & Sunset with Twilight and Daylight Saving Time at Marion / WythevilleJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 126:05 AMJun 126:05 AM8:48 PMJun 278:48 PMJun 27Dec 65:08 PMDec 65:08 PM7:50 AMNov 27:50 AMNov 2Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth at Marion / Wytheville

Solar Elevation and Azimuth at Marion / WythevilleJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM000101010102020203030304040405050606070000101010202020203030404040505060703077NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

Moon Rise, Set & Phases at Marion / Wytheville

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Marion / Wytheville experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.2 months, from June 5 to September 13, during which time the comfort level is muggy, oppressive, or miserable at least 9% of the time. The month with the most muggy days at Marion / Wytheville is July, with 10.1 days that are muggy or worse.

The least muggy day of the year is February 19, when muggy conditions are essentially unheard of.

Humidity Comfort Levels at Marion / Wytheville

Humidity Comfort Levels at Marion / WythevillemuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 190%Feb 190%Jul 2335%Jul 2335%Jun 59%Jun 59%Sep 139%Sep 139%NowNowmuggymuggyhumidhumiddrydrycomfortablecomfortableoppressiveoppressive
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.0d0.7d4.5d10.1d7.2d2.3d0.1d0.0d0.0d

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed at Marion / Wytheville experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.7 months, from November 10 to April 30, with average wind speeds of more than 4.8 miles per hour. The windiest month of the year at Marion / Wytheville is February, with an average hourly wind speed of 6.4 miles per hour.

The calmer time of year lasts for 6.3 months, from April 30 to November 10. The calmest month of the year at Marion / Wytheville is August, with an average hourly wind speed of 3.2 miles per hour.

Average Wind Speed at Marion / Wytheville

Average Wind Speed at Marion / WythevillewindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mph9 mph9 mph10 mph10 mphFeb 256.5 mphFeb 256.5 mphJul 313.2 mphJul 313.2 mphNov 104.8 mphNov 104.8 mphApr 304.8 mphApr 304.8 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 6.26.46.25.44.33.63.33.23.64.35.05.6

The predominant average hourly wind direction at Marion / Wytheville varies throughout the year.

The wind is most often from the south for 2.1 weeks, from September 3 to September 18, with a peak percentage of 29% on September 7. The wind is most often from the west for 12 months, from September 18 to September 3, with a peak percentage of 49% on January 1.

Wind Direction at Marion / Wytheville

Wind Direction at Marion / WythevilleWSWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

To characterize how pleasant the weather is at Marion / Wytheville 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 Marion / Wytheville for general outdoor tourist activities is from early June to mid September, with a peak score in the last week of August.

Tourism Score at Marion / Wytheville

Tourism Score at Marion / Wythevillebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.66.60.30.3NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationtourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 Marion / Wytheville for hot-weather activities is from late June to late August, with a peak score in the third week of July.

Beach/Pool Score at Marion / Wytheville

Beach/Pool Score at Marion / Wythevillebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.15.10.00.0NowNowtemperaturetemperaturecloudscloudsprecipitationprecipitationbeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season at Marion / Wytheville typically lasts for 6.0 months (184 days), from around April 20 to around October 20, rarely starting before March 31 or after May 12, and rarely ending before September 30 or after November 9.

Time Spent in Various Temperature Bands and the Growing Season at Marion / Wytheville

Time Spent in Various Temperature Bands and the Growing Season at Marion / Wythevillegrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 2050%Apr 2050%Oct 2050%Oct 2090%May 1290%May 1290%Sep 3090%Sep 3010%Mar 3110%Mar 3110%Nov 910%Nov 90%Dec 140%Dec 14Jul 26100%Jul 26100%freezingvery coldcoldcoolcomfortablewarmfrigidhot
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms at Marion / Wytheville should appear around March 21, only rarely appearing before March 6 or after April 9.

Growing Degree Days at Marion / Wytheville

Growing Degree Days at Marion / WythevilleJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°F3,500°F3,500°FMar 2189°FMar 2189°FJun 11900°FJun 11900°FJul 241,800°FJul 241,800°FDec 313,353°FDec 313,353°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

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 4.1 months, from April 24 to August 28, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest month of the year at Marion / Wytheville is June, with an average of 6.8 kWh.

The darker period of the year lasts for 3.0 months, from November 8 to February 9, with an average daily incident shortwave energy per square meter below 3.1 kWh. The darkest month of the year at Marion / Wytheville is December, with an average of 2.3 kWh.

Average Daily Incident Shortwave Solar Energy at Marion / Wytheville

Average Daily Incident Shortwave Solar Energy at Marion / WythevillebrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJun 226.9 kWhJun 226.9 kWhDec 232.2 kWhDec 232.2 kWhApr 246.0 kWhApr 246.0 kWhAug 286.0 kWhAug 286.0 kWhFeb 93.1 kWhFeb 93.1 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 2.53.44.55.76.46.86.76.25.34.12.92.3

For the purposes of this report, the geographical coordinates of Marion / Wytheville are 36.900 deg latitude, -81.350 deg longitude, and 2,536 ft elevation.

The topography within 2 miles of Marion / Wytheville contains very significant variations in elevation, with a maximum elevation change of 869 feet and an average elevation above sea level of 2,614 feet. Within 10 miles contains very significant variations in elevation (2,041 feet). Within 50 miles contains large variations in elevation (4,797 feet).

The area within 2 miles of Marion / Wytheville is covered by cropland (60%) and trees (40%), within 10 miles by trees (65%) and cropland (34%), and within 50 miles by trees (80%) and cropland (19%).

This report illustrates the typical weather at Marion / Wytheville, 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

Marion / Wytheville has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Mercer County Airport; Ashe County Airport; Tazewell County Airport; Tazewell County Airport; Hillsville; New River Valley Airport; Virginia Highlands Airport; and North Wilkesboro, Wilkes County Airport.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

Please review our full terms contained on our Terms of Service page.