Average Weather in Hanley Hills Missouri, United States
In Hanley Hills, the summers are hot and muggy, the winters are very cold, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 25°F to 89°F and is rarely below 9°F or above 97°F.
Based on the tourism score, the best times of year to visit Hanley Hills for warm-weather activities are from late May to early July and from late July to late September.
The hot season lasts for 3.7 months, from May 28 to September 18, with an average daily high temperature above 79°F. The hottest day of the year is July 20, with an average high of 89°F and low of 72°F.
The cold season lasts for 3.0 months, from November 28 to February 27, with an average daily high temperature below 50°F. The coldest day of the year is January 22, with an average low of 25°F and high of 41°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
In Hanley Hills, 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 Hanley Hills begins around June 13 and lasts for 4.5 months, ending around October 30. On August 27, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 71% of the time, and overcast or mostly cloudy 29% of the time.
The cloudier part of the year begins around October 30 and lasts for 7.5 months, ending around June 13. On February 12, the cloudiest day of the year, the sky is overcast or mostly cloudy 54% of the time, and clear, mostly clear, or partly cloudy 46% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Hanley Hills varies throughout the year.
The wetter season lasts 5.2 months, from March 20 to August 27, with a greater than 28% chance of a given day being a wet day. The chance of a wet day peaks at 41% on May 21.
The drier season lasts 6.8 months, from August 27 to March 20. The smallest chance of a wet day is 16% on January 13.
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 41% on May 21.
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. Hanley Hills experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Hanley Hills. The most rain falls during the 31 days centered around May 13, with an average total accumulation of 4.1 inches.
The least rain falls around January 24, with an average total accumulation of 1.5 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. Hanley Hills experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 3.8 months, from November 23 to March 17, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 27, with an average total liquid-equivalent accumulation of 0.4 inches.
The snowless period of the year lasts for 8.2 months, from March 17 to November 23. The least snow falls around July 28, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Hanley Hills varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 28 minutes of daylight; the longest day is June 21, with 14 hours, 53 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:36 AM on June 14, and the latest sunrise is 1 hour, 54 minutes later at 7:30 AM on November 3. The earliest sunset is at 4:39 PM on December 7, and the latest sunset is 3 hours, 50 minutes later at 8:30 PM on June 28.
Daylight saving time (DST) is observed in Hanley Hills 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
Hanley Hills experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 4.1 months, from May 20 to September 24, during which time the comfort level is muggy, oppressive, or miserable at least 17% of the time. The muggiest day of the year is July 24, with muggy conditions 69% of the time.
The least muggy day of the year is January 28, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Hanley Hills experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 7.1 months, from October 14 to May 17, with average wind speeds of more than 7.6 miles per hour. The windiest day of the year is April 1, with an average hourly wind speed of 9.6 miles per hour.
The calmer time of year lasts for 4.9 months, from May 17 to October 14. The calmest day of the year is July 31, with an average hourly wind speed of 5.5 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Hanley Hills varies throughout the year.
The wind is most often from the south for 9.8 months, from February 21 to December 14, with a peak percentage of 43% on June 22. The wind is most often from the west for 2.2 months, from December 14 to February 21, with a peak percentage of 34% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Hanley Hills 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 Hanley Hills for general outdoor tourist activities are from late May to early July and from late July to late September, with a peak score in the first 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 Hanley Hills for hot-weather activities is from mid June to early September, with a peak score in the last week of July.
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 Hanley Hills typically lasts for 7.1 months (217 days), from around April 1 to around November 4, rarely starting before March 14 or after April 18, and rarely ending before October 17 or after November 23.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Hanley Hills should appear around March 16, only rarely appearing before March 2 or after April 3.
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 4.1 months, from April 26 to August 29, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is July 2, with an average of 6.8 kWh.
The darker period of the year lasts for 3.1 months, from November 6 to February 9, with an average daily incident shortwave energy per square meter below 3.0 kWh. The darkest day of the year is December 23, with an average of 2.0 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Hanley Hills are 38.686 deg latitude, -90.324 deg longitude, and 577 ft elevation.
The topography within 2 miles of Hanley Hills contains only modest variations in elevation, with a maximum elevation change of 180 feet and an average elevation above sea level of 578 feet. Within 10 miles also contains only modest variations in elevation (482 feet). Within 50 miles contains only modest variations in elevation (896 feet).
The area within 2 miles of Hanley Hills is covered by artificial surfaces (94%), within 10 miles by artificial surfaces (87%), and within 50 miles by cropland (52%) and trees (33%).
This report illustrates the typical weather in Hanley Hills, 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 Hanley Hills.
For each station, the records are corrected for the elevation difference between that station and Hanley Hills 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 Hanley Hills is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Hanley Hills and a given station.
The stations contributing to this reconstruction are: Lambert–St. Louis International Airport (70%, 9 kilometers, northwest); Saint Louis Downtown - Parks Airport (20%, 19 kilometers, southeast); and Saint Louis Regional Airport (10%, 32 kilometers, northeast).
Time zones for aiports and weather stations are provided by AskGeo.com .