Average Weather in Saint Joseph Missouri, United States
In Saint Joseph, the summers are warm, humid, and wet; the winters are short, freezing, dry, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 19°F to 88°F and is rarely below 1°F or above 97°F.
Based on the tourism score, the best time of year to visit Saint Joseph for warm-weather activities is from late May to mid September.
The hot season lasts for 3.8 months, from May 25 to September 19, with an average daily high temperature above 78°F. The hottest day of the year is July 20, with an average high of 88°F and low of 68°F.
The cold season lasts for 3.0 months, from November 29 to February 26, with an average daily high temperature below 47°F. The coldest day of the year is January 6, with an average low of 19°F and high of 37°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 Saint Joseph, 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 Saint Joseph begins around June 9 and lasts for 4.6 months, ending around October 29. On August 27, 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 29 and lasts for 7.3 months, ending around June 9. On February 12, the cloudiest day of the year, the sky is overcast or mostly cloudy 52% of the time, and clear, mostly clear, or partly cloudy 48% 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 Saint Joseph varies significantly throughout the year.
The wetter season lasts 5.9 months, from March 29 to September 26, with a greater than 26% chance of a given day being a wet day. The chance of a wet day peaks at 44% on June 8.
The drier season lasts 6.1 months, from September 26 to March 29. The smallest chance of a wet day is 8% on January 12.
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 Saint Joseph changes throughout the year.
Rain alone is the most common for 11 months, from January 22 to December 26. The highest chance of a day with rain alone is 44% on June 8.
Snow alone is the most common for 3.9 weeks, from December 26 to January 22. The highest chance of a day with snow alone is 5% on December 24.
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. Saint Joseph experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 11 months, from January 29 to December 30, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around June 1, with an average total accumulation of 4.8 inches.
The rainless period of the year lasts for 1.0 months, from December 30 to January 29. The least rain falls around January 13, with an average total accumulation of 0.4 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. Saint Joseph experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 4.2 months, from November 15 to March 22, 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 0.3 inches.
The snowless period of the year lasts for 7.8 months, from March 22 to November 15. The least snow falls around July 24, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Saint Joseph varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 21 minutes of daylight; the longest day is June 21, with 14 hours, 59 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:50 AM on June 13, and the latest sunrise is 2 hours, 0 minutes later at 7:50 AM on November 3. The earliest sunset is at 4:54 PM on December 7, and the latest sunset is 3 hours, 57 minutes later at 8:51 PM on June 27.
Daylight saving time (DST) is observed in Saint Joseph 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
Saint Joseph experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.7 months, from May 29 to September 19, 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 23, with muggy conditions 67% of the time.
The least muggy day of the year is February 8, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Saint Joseph experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 7.4 months, from October 12 to May 24, with average wind speeds of more than 10.3 miles per hour. The windiest day of the year is April 1, with an average hourly wind speed of 12.6 miles per hour.
The calmer time of year lasts for 4.6 months, from May 24 to October 12. The calmest day of the year is August 7, with an average hourly wind speed of 8.0 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Saint Joseph varies throughout the year.
The wind is most often from the south for 8.4 months, from April 2 to December 13, with a peak percentage of 52% on July 5. The wind is most often from the north for 3.6 months, from December 13 to April 2, with a peak percentage of 34% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Saint Joseph 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 Saint Joseph for general outdoor tourist activities is from late May to mid September, with a peak score in the last 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 Saint Joseph for hot-weather activities is from late June to mid August, with a peak score in the third 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 Saint Joseph typically lasts for 6.0 months (182 days), from around April 15 to around October 14, rarely starting before March 28 or after May 3, and rarely ending before September 25 or after November 3.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Saint Joseph should appear around March 25, only rarely appearing before March 11 or after April 15.
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 3.9 months, from April 29 to August 24, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest day of the year is July 2, with an average of 7.0 kWh.
The darker period of the year lasts for 3.2 months, from November 4 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 20, with an average of 2.0 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Saint Joseph are 39.769 deg latitude, -94.847 deg longitude, and 915 ft elevation.
The topography within 2 miles of Saint Joseph contains only modest variations in elevation, with a maximum elevation change of 276 feet and an average elevation above sea level of 898 feet. Within 10 miles also contains only modest variations in elevation (400 feet). Within 50 miles contains only modest variations in elevation (636 feet).
The area within 2 miles of Saint Joseph is covered by artificial surfaces (83%) and trees (12%), within 10 miles by cropland (74%) and trees (14%), and within 50 miles by cropland (82%).
This report illustrates the typical weather in Saint Joseph, 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 Saint Joseph.
For each station, the records are corrected for the elevation difference between that station and Saint Joseph 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 Saint Joseph is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Saint Joseph and a given station.
The stations contributing to this reconstruction are: Rosecrans Memorial Airport (94%, 7 kilometers, west); Kansas City International Airport (4.7%, 53 kilometers, south); and Lamoni Municipal Airport (1.3%, 125 kilometers, northeast).
Time zones for aiports and weather stations are provided by AskGeo.com .