Average Weather in April in Spencer Iowa, United States
Daily high temperatures increase by 14°F, from 52°F to 66°F, rarely falling below 36°F or exceeding 81°F.
Daily low temperatures increase by 11°F, from 32°F to 43°F, rarely falling below 20°F or exceeding 55°F.
For reference, on July 8, the hottest day of the year, temperatures in Spencer typically range from 63°F to 84°F, while on January 20, the coldest day of the year, they range from 9°F to 26°F.
Average High and Low Temperature in April
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in April
The month of April in Spencer experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 51% throughout the month.
The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 51% of the time.
For reference, on February 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 56%, while on July 28, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 73%.
Cloud Cover Categories in April
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Spencer, the chance of a wet day over the course of April is very rapidly increasing, starting the month at 22% and ending it at 33%.
For reference, the year's highest daily chance of a wet day is 41% on June 7, and its lowest chance is 7% on January 14.
Over the course of April in Spencer, the chance of a day with only rain increases from 17% to 32%, the chance of a day with mixed snow and rain decreases from 3% to 1%, and the chance of a day with only snow remains an essentially constant 1% throughout.
Probability of Precipitation in April
The average sliding 31-day rainfall during April in Spencer is rapidly increasing, starting the month at 2.0 inches, when it rarely exceeds 3.5 inches or falls below 0.7 inches, and ending the month at 3.1 inches, when it rarely exceeds 5.1 inches or falls below 1.4 inches.
Average Monthly Rainfall in April
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. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during April in Spencer is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.4 inches or falling below -0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in April
Over the course of April in Spencer, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 21 minutes, implying an average daily increase of 2 minutes, 47 seconds, and weekly increase of 19 minutes, 29 seconds.
The shortest day of the month is April 1, with 12 hours, 45 minutes of daylight and the longest day is April 30, with 14 hours, 5 minutes of daylight.
Hours of Daylight and Twilight in April
The latest sunrise of the month in Spencer is 7:02 AM on April 1 and the earliest sunrise is 47 minutes earlier at 6:15 AM on April 30.
The earliest sunset is 7:47 PM on April 1 and the latest sunset is 34 minutes later at 8:20 PM on April 30.
Daylight saving time is observed in Spencer during 2018, but it neither starts nor ends during April, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:40 AM and sets 15 hours, 23 minutes later, at 9:03 PM, while on December 21, the shortest day of the year, it rises at 7:49 AM and sets 8 hours, 59 minutes later, at 4:48 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in April
The chance that a given day will be muggy in Spencer is essentially constant during April, remaining around 0% throughout.
For reference, on July 21, the muggiest day of the year, there are muggy conditions 43% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in April
The average hourly wind speed in Spencer is gradually decreasing during April, decreasing from 13.5 miles per hour to 13.0 miles per hour over the course of the month.
For reference, on April 8, the windiest day of the year, the daily average wind speed is 13.5 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 8.6 miles per hour.
The highest daily average wind speed during April is 13.5 miles per hour on April 9.
Average Wind Speed in April
Wind Direction in April
The growing season in Spencer typically lasts for 4.9 months (152 days), from around May 1 to around September 30, rarely starting before April 13 or after May 19, and rarely ending before September 14 or after October 17.
The month of April in Spencer is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season rapidly increasing from 2% to 47% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in April
The average accumulated growing degree days in Spencer are gradually increasing during April, increasing by 120°F, from 32°F to 152°F, over the course of the month.
Growing Degree Days in April
The average daily incident shortwave solar energy in Spencer is increasing during April, rising by 1.1 kWh, from 4.8 kWh to 5.9 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in April
For the purposes of this report, the geographical coordinates of Spencer are 43.141 deg latitude, -95.144 deg longitude, and 1,325 ft elevation.
The topography within 2 miles of Spencer is essentially flat, with a maximum elevation change of 62 feet and an average elevation above sea level of 1,320 feet. Within 10 miles is essentially flat (213 feet). Within 50 miles contains only modest variations in elevation (679 feet).
The area within 2 miles of Spencer is covered by cropland (69%) and artificial surfaces (29%), within 10 miles by cropland (98%), and within 50 miles by cropland (98%).
This report illustrates the typical weather in Spencer year round, 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 Spencer.
For each station, the records are corrected for the elevation difference between that station and Spencer 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 Spencer is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Spencer and a given station.
The stations contributing to this reconstruction are: Spencer Municipal Airport (94%, 5.3 kilometers, northwest); Estherville Municipal Airport (4.0%, 43 kilometers, northeast); and Storm Lake Municipal Airport (2.4%, 61 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .