Average Weather in Atlantic Iowa, United States
In Atlantic, the summers are long, warm, humid, and wet; the winters are freezing, dry, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 15°F to 86°F and is rarely below -5°F or above 94°F.
Based on the tourism score, the best time of year to visit Atlantic for warm-weather activities is from early June to mid September.
The hot season lasts for 4.0 months, from May 21 to September 21, with an average daily high temperature above 75°F. The hottest day of the year is July 18, with an average high of 86°F and low of 66°F.
The cold season lasts for 3.0 months, from November 27 to February 28, with an average daily high temperature below 43°F. The coldest day of the year is January 13, with an average low of 15°F and high of 33°F.
Average High and Low Temperature
Average Hourly Temperature
Kara-Balta, Kyrgyzstan (6,584 miles away); Taiyuan, China (6,697 miles); and Kosan, North Korea (6,289 miles) are the far-away foreign places with temperatures most similar to Atlantic (view comparison).
In Atlantic, 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 Atlantic begins around June 8 and lasts for 4.5 months, ending around October 24. On August 26, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 72% of the time, and overcast or mostly cloudy 28% of the time.
The cloudier part of the year begins around October 24 and lasts for 7.5 months, ending around June 8. On December 28, the cloudiest day of the year, the sky is overcast or mostly cloudy 53% of the time, and clear, mostly clear, or partly cloudy 47% 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 Atlantic varies significantly throughout the year.
The wetter season lasts 5.8 months, from April 9 to October 3, with a greater than 26% chance of a given day being a wet day. The chance of a wet day peaks at 43% on June 7.
The drier season lasts 6.2 months, from October 3 to April 9. The smallest chance of a wet day is 8% on January 9.
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 in Atlantic changes throughout the year.
Rain alone is the most common for 9.8 months, from February 18 to December 13. The highest chance of a day with rain alone is 43% on June 7.
Snow alone is the most common for 2.2 months, from December 13 to February 18. The highest chance of a day with snow alone is 5% on December 23.
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. Atlantic experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 10 months, from February 19 to December 21, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around June 14, with an average total accumulation of 4.5 inches.
The rainless period of the year lasts for 1.9 months, from December 21 to February 19. The least rain falls around January 20, with an average total accumulation of 0.2 inches.
Average Monthly Rainfall
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Atlantic experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 4.9 months, from November 1 to March 30, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around December 15, with an average total liquid-equivalent accumulation of 0.4 inches.
The snowless period of the year lasts for 7.1 months, from March 30 to November 1. The least snow falls around July 20, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Atlantic varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 11 minutes of daylight; the longest day is June 21, with 15 hours, 10 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:45 AM on June 14, and the latest sunrise is 2 hours, 8 minutes later at 7:54 AM on November 3. The earliest sunset is at 4:50 PM on December 7, and the latest sunset is 4 hours, 7 minutes later at 8:57 PM on June 27.
Daylight saving time (DST) is observed in Atlantic 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
Atlantic experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.5 months, from June 2 to September 17, during which time the comfort level is muggy, oppressive, or miserable at least 14% of the time. The muggiest day of the year is July 21, with muggy conditions 57% of the time.
The least muggy day of the year is February 3, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Atlantic experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 8.0 months, from September 27 to May 28, with average wind speeds of more than 10.8 miles per hour. The windiest day of the year is April 1, with an average hourly wind speed of 13.2 miles per hour.
The calmer time of year lasts for 4.0 months, from May 28 to September 27. The calmest day of the year is August 5, with an average hourly wind speed of 8.4 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Atlantic varies throughout the year.
The wind is most often from the south for 7.8 months, from April 19 to December 12, with a peak percentage of 49% on August 29. The wind is most often from the north for 4.2 months, from December 12 to April 19, with a peak percentage of 34% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Atlantic 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 Atlantic for general outdoor tourist activities is from early June to mid September, with a peak score in the second week of August.
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 Atlantic for hot-weather activities is from late June to mid August, with a peak score in the third week of July.
The growing season in Atlantic typically lasts for 5.4 months (163 days), from around April 22 to around October 2, rarely starting before April 4 or after May 12, and rarely ending before September 14 or after October 22.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Atlantic should appear around April 6, only rarely appearing before March 24 or after April 24.
Growing Degree Days
The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.6 months, from May 2 to August 23, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest day of the year is July 4, with an average of 7.1 kWh.
The darker period of the year lasts for 3.2 months, from November 2 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 21, with an average of 1.9 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Atlantic are 41.404 deg latitude, -95.014 deg longitude, and 1,201 ft elevation.
The topography within 2 miles of Atlantic contains only modest variations in elevation, with a maximum elevation change of 289 feet and an average elevation above sea level of 1,201 feet. Within 10 miles also contains only modest variations in elevation (344 feet). Within 50 miles contains only modest variations in elevation (679 feet).
The area within 2 miles of Atlantic is covered by cropland (89%) and artificial surfaces (10%), within 10 miles by cropland (99%), and within 50 miles by cropland (95%).
This report illustrates the typical weather in Atlantic, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Atlantic.
For each station, the records are corrected for the elevation difference between that station and Atlantic 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 Atlantic is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Atlantic and a given station.
The stations contributing to this reconstruction are: Atlantic Municipal Airport (97%, 2.8 kilometers, west); Audubon County Airport (2.3%, 34 kilometers, north); and Creston Municipal Airport (0.8%, 70 kilometers, southeast).
Time zones for aiports and weather stations are provided by AskGeo.com .