Average Weather at Newton Municipal Airport Iowa, United States

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2. United States
3. Iowa
4. Jasper County
5. Newton Municipal Airport

At Newton Municipal Airport, 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 16°F to 85°F and is rarely below -4°F or above 94°F.

The hot season lasts for 4.1 months, from May 20 to September 22, with an average daily high temperature above 74°F. The hottest day of the year is July 19, with an average high of 85°F and low of 66°F.

The cold season lasts for 3.1 months, from November 28 to March 1, with an average daily high temperature below 42°F. The coldest day of the year is January 22, with an average low of 16°F and high of 32°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.

At Newton Municipal Airport, 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 Newton Municipal Airport begins around June 8 and lasts for 4.6 months, ending around October 26. On July 28, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 70% of the time, and overcast or mostly cloudy 30% of the time.

The cloudier part of the year begins around October 26 and lasts for 7.4 months, ending around June 8. On February 13, 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.

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

The wetter season lasts 5.8 months, from April 6 to October 1, with a greater than 27% chance of a given day being a wet day. The chance of a wet day peaks at 44% on June 7.

The drier season lasts 6.2 months, from October 1 to April 6. The smallest chance of a wet day is 9% on January 16.

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 at Newton Municipal Airport changes throughout the year.

Rain alone is the most common for 10 months, from February 10 to December 17. The highest chance of a day with rain alone is 44% on June 7.

Snow alone is the most common for 1.8 months, from December 17 to February 10. The highest chance of a day with snow alone is 6% on January 6.

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. Newton Municipal Airport experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 10 months, from February 12 to December 25, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around June 16, with an average total accumulation of 4.6 inches.

The rainless period of the year lasts for 1.5 months, from December 25 to February 12. The least rain falls around January 20, with an average total accumulation of 0.3 inches.

Snowfall

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. Newton Municipal Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 4.5 months, from November 9 to March 25, 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 17, with an average total liquid-equivalent accumulation of 0.4 inches.

The snowless period of the year lasts for 7.5 months, from March 25 to November 9. The least snow falls around July 27, with an average total liquid-equivalent accumulation of 0.0 inches.

The length of the day at Newton Municipal Airport varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 9 minutes of daylight; the longest day is June 21, with 15 hours, 12 minutes of daylight.

The earliest sunrise is at 5:37 AM on June 15, and the latest sunrise is 2 hours, 11 minutes later at 7:48 AM on November 4. The earliest sunset is at 4:41 PM on December 8, and the latest sunset is 4 hours, 9 minutes later at 8:50 PM on June 26.

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

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.

Newton Municipal Airport experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.5 months, from June 1 to September 16, during which time the comfort level is muggy, oppressive, or miserable at least 15% of the time. The muggiest day of the year is July 21, with muggy conditions 56% of the time.

The least muggy day of the year is February 5, when muggy conditions are essentially unheard of.

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 Newton Municipal Airport experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 7.8 months, from October 2 to May 27, with average wind speeds of more than 5.5 miles per hour. The windiest day of the year is April 1, with an average hourly wind speed of 6.9 miles per hour.

The calmer time of year lasts for 4.2 months, from May 27 to October 2. The calmest day of the year is August 3, with an average hourly wind speed of 4.2 miles per hour.

The predominant average hourly wind direction at Newton Municipal Airport varies throughout the year.

The wind is most often from the north for 3.6 months, from January 4 to April 22, with a peak percentage of 35% on March 8. The wind is most often from the south for 7.3 months, from April 22 to December 1, with a peak percentage of 43% on July 2. The wind is most often from the west for 1.1 months, from December 1 to January 4, with a peak percentage of 32% on January 1.

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 extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.7 months, from May 2 to August 24, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is July 3, with an average of 7.0 kWh.

The darker period of the year lasts for 3.3 months, from November 1 to February 10, with an average daily incident shortwave energy per square meter below 2.8 kWh. The darkest day of the year is December 22, with an average of 1.8 kWh.

For the purposes of this report, the geographical coordinates of Newton Municipal Airport are 41.677 deg latitude, -93.022 deg longitude, and 906 ft elevation.

The topography within 2 miles of Newton Municipal Airport contains only modest variations in elevation, with a maximum elevation change of 148 feet and an average elevation above sea level of 908 feet. Within 10 miles also contains only modest variations in elevation (279 feet). Within 50 miles contains only modest variations in elevation (591 feet).

The area within 2 miles of Newton Municipal Airport is covered by cropland (85%), within 10 miles by cropland (96%), and within 50 miles by cropland (90%).

This report illustrates the typical weather at Newton Municipal Airport, 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

Newton Municipal Airport 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 Pella Municipal Airport, Grinnell Regional Airport, Knoxville, Marshalltown Municipal Airport, Ankeny Regional Airport, Des Moines International Airport, Ames Municipal Airport, and Oskaloosa Municipal 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 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.