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Average Weather at Isbell Field Alabama, United States

At Isbell Field, the summers are hot and muggy, the winters are very cold and wet, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 31°F to 88°F and is rarely below 18°F or above 95°F.

Climate Summary

coldcoolwarmhotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDec67%67%44%44%overcastclearprecipitation: 4.8 inprecipitation: 4.8 in2.7 in2.7 inmuggy: 79%muggy: 79%0%0%drydrytourism score: 6.4tourism score: 6.40.80.8
Click on each chart for more information.

Based on the tourism score, the best times of year to visit Isbell Field for warm-weather activities are from mid May to early July and from late July to early October.

Temperature

The hot season lasts for 3.7 months, from May 28 to September 19, with an average daily high temperature above 81°F. The hottest day of the year is July 23, with an average high of 88°F and low of 67°F.

The cold season lasts for 3.0 months, from November 28 to February 27, with an average daily high temperature below 58°F. The coldest day of the year is January 29, with an average low of 31°F and high of 51°F.

Average High and Low Temperature

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.

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

Average Hourly Temperature at Isbell FieldJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMvery coldvery coldcoldcoolwarmhotcoldcoolvery coldvery coldcomfortable
The average hourly temperature, color coded into bands: 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 shaded overlays indicate night and civil twilight.

Midelt, Morocco (4,531 miles away); Ballobar, Spain (4,508 miles); and Luoqiao, China (7,934 miles) are the far-away foreign places with temperatures most similar to Isbell Field (view comparison).

Clouds

At Isbell Field, 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 Isbell Field begins around June 7 and lasts for 5.5 months, ending around November 21. On September 20, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 67% of the time, and overcast or mostly cloudy 33% of the time.

The cloudier part of the year begins around November 21 and lasts for 6.5 months, ending around June 7. On January 4, the cloudiest day of the year, the sky is overcast or mostly cloudy 56% of the time, and clear, mostly clear, or partly cloudy 44% of the time.

Cloud Cover Categories

Cloud Cover Categories at Isbell FieldclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 2067%Sep 2067%Jan 444%Jan 444%Jun 755%Jun 755%Nov 2156%Nov 2156%mostly cloudyovercastclearpartly cloudymostly clear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

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

The wetter season lasts 4.8 months, from March 28 to August 21, with a greater than 32% chance of a given day being a wet day. The chance of a wet day peaks at 43% on July 9.

The drier season lasts 7.2 months, from August 21 to March 28. The smallest chance of a wet day is 21% on October 15.

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 43% on July 9.

Daily Chance of Precipitation

Daily Chance of Precipitation at Isbell FieldwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 943%Jul 943%Oct 1521%Oct 1521%Jan 130%Jan 130%Mar 2832%Mar 2832%Aug 2132%Aug 2132%rainmixed
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).

Rainfall

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. Isbell Field experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year at Isbell Field. The most rain falls during the 31 days centered around December 2, with an average total accumulation of 4.8 inches.

The least rain falls around August 22, with an average total accumulation of 2.7 inches.

Average Monthly Rainfall

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 liquid-equivalent snowfall.

Snowfall

The sliding 31-day liquid-equivalent quantity of snowfall at Isbell Field does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Isbell FieldsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in1 in2 in3 in4 in5 inJan 210.1 inJan 210.1 inJul 260.0 inJul 260.0 in
The average liquid-equivalent 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.

Sun

The length of the day at Isbell Field varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 51 minutes of daylight; the longest day is June 20, with 14 hours, 28 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Isbell FieldJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2014 hr, 28 minJun 2014 hr, 28 minJun 2012 hr, 8 minSep 2212 hr, 8 minSep 229 hr, 51 minDec 219 hr, 51 minDec 21nightnightday
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.

The earliest sunrise is at 5:29 AM on June 12, and the latest sunrise is 1 hour, 36 minutes later at 7:06 AM on November 4. The earliest sunset is at 4:32 PM on December 5, and the latest sunset is 3 hours, 27 minutes later at 7:59 PM on June 28.

Daylight saving time (DST) is observed at Isbell Field during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time at Isbell FieldJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 125:29 AMJun 125:29 AM7:59 PMJun 287:59 PMJun 28Dec 54:32 PMDec 54:32 PM7:06 AMNov 47:06 AMNov 4Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2017. 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.

Humidity

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.

Isbell Field experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.0 months, from May 25 to September 25, during which time the comfort level is muggy, oppressive, or miserable at least 20% of the time. The muggiest day of the year is July 25, with muggy conditions 79% of the time.

The least muggy day of the year is February 26, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels at Isbell FieldmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Feb 260%Feb 260%79%Jul 2579%Jul 25May 2520%May 2520%Sep 2520%Sep 2520%muggymuggyhumidhumiddrydryoppressiveoppressivecomfortablecomfortable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 Isbell Field experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.6 months, from October 24 to May 12, with average wind speeds of more than 4.5 miles per hour. The windiest day of the year is February 26, with an average hourly wind speed of 5.6 miles per hour.

The calmer time of year lasts for 5.4 months, from May 12 to October 24. The calmest day of the year is August 1, with an average hourly wind speed of 3.3 miles per hour.

Average Wind Speed

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Isbell Field varies throughout the year.

The wind is most often from the south for 3.1 months, from March 13 to June 15 and for 1.1 months, from November 12 to December 15, with a peak percentage of 39% on May 4. The wind is most often from the west for 1.8 months, from June 15 to August 9, with a peak percentage of 38% on July 14. The wind is most often from the north for 1.4 weeks, from August 9 to August 19; for 1.3 months, from October 4 to November 12; and for 2.9 months, from December 15 to March 13, with a peak percentage of 32% on October 13.

Wind Direction

Wind Direction at Isbell FieldNSWNENSNJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%eastwestnorthsouth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Best Time of Year to Visit

To characterize how pleasant the weather is at Isbell Field 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 times of year to visit Isbell Field for general outdoor tourist activities are from mid May to early July and from late July to early October, with a peak score in the first week of September.

Tourism Score

Tourism Score at Isbell Fieldbest timebest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.46.40.80.86.06.05.75.7 precipitationprecipitationcloudscloudstemperaturetemperaturetourism 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 Isbell Field for hot-weather activities is from late June to early September, with a peak score in the second week of August.

Beach/Pool Score

Beach/Pool Score at Isbell Fieldbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468105.95.90.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/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.

Growing Season

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 Isbell Field typically lasts for 6.5 months (200 days), from around April 11 to around October 28, rarely starting before March 22 or after April 29, and rarely ending before October 9 or after November 16.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Isbell Fieldgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 1150%Apr 1150%Oct 2850%Oct 2890%Apr 2990%Apr 2990%Oct 990%Oct 910%Mar 2210%Mar 2210%Nov 1610%Nov 160%Dec 210%Dec 21Jul 20100%Jul 20100%very coldwarmhotcoldcoolfreezingcomfortable
The percentage of time spent in various temperature bands: 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 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 Isbell Field should appear around February 21, only rarely appearing before February 2 or after March 12.

Growing Degree Days

Growing Degree Days at Isbell FieldJanFebMarAprMayJunJulAugSepOctNovDec0°F500°F1,000°F1,500°F2,000°F2,500°F3,000°F3,500°F4,000°F4,500°FFeb 2187°FFeb 2187°FMay 22900°FMay 22900°FJul 31,800°FJul 31,800°FDec 314,468°FDec 314,468°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 4.7 months, from April 12 to September 3, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest day of the year is June 23, with an average of 6.6 kWh.

The darker period of the year lasts for 2.8 months, from November 13 to February 6, with an average daily incident shortwave energy per square meter below 3.3 kWh. The darkest day of the year is December 25, with an average of 2.4 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Isbell FieldbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJun 236.6 kWhJun 236.6 kWhDec 252.4 kWhDec 252.4 kWhApr 125.8 kWhApr 125.8 kWhSep 35.8 kWhSep 35.8 kWhFeb 63.3 kWhFeb 63.3 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Isbell Field are 34.473 deg latitude, -85.720 deg longitude, and 997 ft elevation.

The topography within 2 miles of Isbell Field contains significant variations in elevation, with a maximum elevation change of 577 feet and an average elevation above sea level of 957 feet. Within 10 miles contains significant variations in elevation (1,152 feet). Within 50 miles also contains very significant variations in elevation (1,870 feet).

The area within 2 miles of Isbell Field is covered by trees (47%), cropland (29%), and artificial surfaces (24%), within 10 miles by trees (49%) and cropland (48%), and within 50 miles by trees (61%) and cropland (31%).

Data Sources

This report illustrates the typical weather at Isbell Field, 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

Isbell Field 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 Scottsboro Municipal Airport Word Field; Richard B Russell Airport; Albertville, Albertville Municipal Airport; Northeast Alabama Regional Airport; Lovell Field; Dalton Municipal Airport; Anniston Metropolitan Airport; and Huntsville Airport North.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

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.