Average Weather in Cullman Alabama, United States
In Cullman, the summers are long, hot, and muggy; the winters are short, very cold, and wet; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 34°F to 89°F and is rarely below 19°F or above 95°F.
Based on the tourism score, the best times of year to visit Cullman for warm-weather activities are from early May to mid June and from mid August to mid October.
The hot season lasts for 3.9 months, from May 24 to September 21, with an average daily high temperature above 82°F. The hottest day of the year is July 22, with an average high of 89°F and low of 70°F.
The cool season lasts for 3.0 months, from November 30 to February 26, with an average daily high temperature below 59°F. The coldest day of the year is January 23, with an average low of 34°F and high of 51°F.
Average High and Low Temperature
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
Bir el Ater, Algeria (5,175 miles away); Kafr Takhārīm, Syria (6,370 miles); and Yangzhong, China (7,902 miles) are the far-away foreign places with temperatures most similar to Cullman (view comparison).
In Cullman, 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 in Cullman begins around May 31 and lasts for 5.7 months, ending around November 22. On October 2, 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 22 and lasts for 6.3 months, ending around May 31. On January 4, the cloudiest day of the year, the sky is overcast or mostly cloudy 55% of the time, and clear, mostly clear, or partly cloudy 45% 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 Cullman varies throughout the year.
The wetter season lasts 7.5 months, from January 4 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 42% on July 9.
The drier season lasts 4.5 months, from August 21 to January 4. 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 42% on July 9.
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. Cullman experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Cullman. The most rain falls during the 31 days centered around March 9, with an average total accumulation of 4.9 inches.
The least rain falls around August 22, with an average total accumulation of 2.8 inches.
Average Monthly Rainfall
The sliding 31-day liquid-equivalent quantity of snowfall in Cullman 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
The length of the day in Cullman varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 52 minutes of daylight; the longest day is June 20, with 14 hours, 26 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:35 AM on June 12, and the latest sunrise is 1 hour, 35 minutes later at 7:10 AM on November 4. The earliest sunset is at 4:37 PM on December 4, and the latest sunset is 3 hours, 26 minutes later at 8:03 PM on June 28.
Daylight saving time (DST) is observed in Cullman 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
Cullman experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 4.5 months, from May 16 to September 30, during which time the comfort level is muggy, oppressive, or miserable at least 22% of the time. The muggiest day of the year is July 23, with muggy conditions 89% of the time.
The least muggy day of the year is January 14, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Cullman experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 6.8 months, from October 20 to May 13, with average wind speeds of more than 4.7 miles per hour. The windiest day of the year is February 26, with an average hourly wind speed of 6.0 miles per hour.
The calmer time of year lasts for 5.2 months, from May 13 to October 20. The calmest day of the year is July 28, with an average hourly wind speed of 3.5 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Cullman varies throughout the year.
The wind is most often from the north for 2.2 months, from January 2 to March 8; for 1.1 months, from July 30 to September 2; and for 1.5 months, from September 17 to November 1, with a peak percentage of 35% on January 28. The wind is most often from the south for 3.7 months, from March 8 to June 30 and for 2.0 months, from November 1 to January 2, with a peak percentage of 44% on May 4. The wind is most often from the west for 1.0 months, from June 30 to July 30, with a peak percentage of 34% on July 14.
Best Time of Year to Visit
To characterize how pleasant the weather is in Cullman 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 Cullman for general outdoor tourist activities are from early May to mid June and from mid August to mid October, with a peak score in the third 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 Cullman for hot-weather activities is from mid June to mid September, with a peak score in the second week of August.
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.
The growing season in Cullman typically lasts for 7.3 months (224 days), from around March 28 to around November 6, rarely starting before March 1 or after April 17, and rarely ending before October 19 or after November 27.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Cullman should appear around February 15, only rarely appearing before January 25 or after March 7.
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 4.8 months, from April 10 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 5, with an average of 6.6 kWh.
The darker period of the year lasts for 2.7 months, from November 13 to February 5, 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 2.5 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Cullman are 34.175 deg latitude, -86.844 deg longitude, and 784 ft elevation.
The topography within 2 miles of Cullman contains only modest variations in elevation, with a maximum elevation change of 292 feet and an average elevation above sea level of 797 feet. Within 10 miles contains only modest variations in elevation (643 feet). Within 50 miles contains significant variations in elevation (1,398 feet).
The area within 2 miles of Cullman is covered by artificial surfaces (58%), cropland (30%), and trees (12%), within 10 miles by cropland (61%) and trees (33%), and within 50 miles by trees (52%) and cropland (36%).
This report illustrates the typical weather in Cullman, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Cullman.
For each station, the records are corrected for the elevation difference between that station and Cullman 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 Cullman is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Cullman and a given station.
The stations contributing to this reconstruction are: Cullman Regional Airport-Folsom Field (78%, 11 kilometers, north); Walker County Airport-Bevill Field (8%, 53 kilometers, southwest); Albertville, Albertville Municipal Airport (8%, 54 kilometers, east); and Birmingham–Shuttlesworth International Airport (6%, 68 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .