This report describes the historical weather record at the Lee's Summit Municipal Airport (Lee's Summit, Missouri, United States) during the last 12 months. This station has records back to April 2002.
Lee's Summit, Missouri has a humid continental climate with hot summers and no dry season. The area within 25 mi of this station is covered by croplands (37%), grasslands (31%), forests (16%), and built-up areas (15%)
Daylight saving time (DST) was observed at Lee's Summit, Missouri during the last 12 months. There were two time changes during the last 12 months:
2013 is not a leap year, so it has 365 days and no February 29th. The first leap year before 2013 was 2012 and the first after will be 2016.
The summer and winter solstices and the spring and fall equinoxes mark the passing of the seasons. They fall on nearly the same day each year, with differences of a day or two depending on the year. In 2013 they occurred on:
|Spring Equinox||Wednesday, 20 March 2013.|
|Summer Solstice||Friday, 21 June 2013.|
|Fall Equinox||Sunday, 22 September 2013.|
|Winter Solstice||Saturday, 21 December 2013.|
The hottest day of the last 12 months was September 8, with a high temperature of 99°F. For reference, on that day the average high temperature is 80°F and the high temperature exceeds 89°F only one day in ten. The hottest month of the last 12 months was July with an average daily high temperature of 86°F.
Relative to the average, the hottest day was January 28. The high temperature that day was 74°F, compared to the average of 39°F, a difference of 35°F. In relative terms the warmest month was January, with an average high temperature of 44°F, compared to an typical value of 39°F.
The longest warm spell was from August 20 to September 2, constituting 14 consecutive days with warmer than average high temperatures. The month of September had the largest fraction of warmer than average days with 63% days with higher than average high temperatures.
The coldest day of the last 12 months was February 1, with a low temperature of 7°F. For reference, on that day the average low temperature is 22°F and the low temperature drops below 9°F only one day in ten. The coldest month of the last 12 months was December with an average daily low temperature of 23°F.
Relative to the average, the coldest day was November 12. The low temperature that day was 17°F, compared to the average of 39°F, a difference of 22°F. In relative terms the coldest month was March, with an average low temperature of 31°F, compared to an typical value of 38°F.
The longest cold spell was from March 16 to March 30, constituting 15 consecutive days with cooler than average low temperatures. The month of March had the largest fraction of cooler than average days with 84% days with lower than average low temperatures.
The clearest month of the last 12 months was September, with 87% of days being more clear than cloudy. The longest spell of clear weather was from June 17 to July 15, constituting 29 consecutive days that were clearer than they were cloudy.
The cloudiest month of the last 12 months was March, with 45% of days being more cloudy than clear. The longest spell of cloudy weather was from February 26 to March 3, constituting 6 consecutive days that were cloudier than they were clear.
This station reports both the quantity of liquid precipitation and categorical observations of precipitation (e.g., moderate rain, or heavy snow). Both are subject to erroneous reports, but the former is particularly prone to false reports, especially ones indicating an excessive quantity of precipitation. Please bear this in mind when reading the extrema reported in this section.
The day with the largest quantity of precipitation was May 31. That day saw 2.075" of liquid (or liquid equivalent) precipitation, compared to a median value of 0.223". The month with the most precipitation was May, with 8.379", compared to a median value of 4.793".
As determined by quantitative measurements, the longest dry spell was from August 13 to September 1, constituting 20 consecutive days with no measured precipitation. The month with the largest fraction of dry days was January, with 87% of days reporting no measured precipitation at all.
The month with the largest fraction of days with at least some measured precipitation was April, with 43% of days reporting some measured precipitation.
This station reports when significant weather events (including precipitation) are visually observed at or near the station. Such events do not always correspond to measured quantities of liquid equivalent precipitation, such as when the event is near by not at the station, or in the case of solid precipitation that does not melt in the collection basin.
The day in the last 12 months with the most precipitation observations was May 3. There were 20 hourly weather reports that day (out of a maximum of 24) in which some form of precipitation was observated at or near the station. The month with the most precipitation observations was May, with 91 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from December 7 to December 31, constituting 25 consecutive days with no observed precipitation. The month with the largest fraction of days without observed precipitation was December, with 90% of days reporting no observed precipitation at all.
The month with the largest fraction of days with at least some observed precipitation was April, with 43% of days reporting some observed precipitation.
In this section we consider only those weather reports that indicate liquid precipitation. For the purposes of this analysis, we include thunderstorms even though some thunderstorms are not accompanied by liquid precipitation.
The month of the last 12 months with the largest number of those reports was May, with a total of 70 reports. The day with the largest number of those reports was May 30, with a total of 16 reports.
This station reports when snow is observed falling but does not report the quantity of snow that has fallen or the depth of snow on the ground.
In this section we consider hourly weather reports that contain an observation of falling snow. These reports do not necessarily correspond to accumulation.
The first reported snow fall in the last 12 months was on December 31; the last was on December 6. The month of the last 12 months with the largest number of those reports was February, with a total of 54 reports. The day with the largest number of those reports was February 26, with a total of 19 reports.
Humidity is an important factor in determining how weather conditions feel to a person experiencing them. Hot and humid days feel even hotter than hot and dry days because the high level of water content in humid air discourages the evaporation of sweat from a person's skin.
When reading the graph below, keep in mind that the hottest part of the day tends to be the least humid, so the daily low (brown) traces are more relevant for understanding daytime comfort than the daily high (blue) traces, which typically occur during the night. Applying that observation, the least humid month of the last 12 months was November with an average daily low humidity of 42%, and the most humid month was May with an average daily low humidity of 54%.
But it is important to keep in mind that humidity does not tell the whole picture and the dew point is often a better measure of how comfortable a person will find a given set of weather conditions. Please see the next section for continued discussion of this point.
Dew point is the temperature below which water vapor will condense into liquid water. It is therefore also related to the rate of evaporation of liquid water. Since the evaporation of sweat is an important cooling mechanism for the human body, the dew point is an important measurement for understanding how dry, comfortable, or humid a given set of weather conditions will feel.
Generally speaking, dew points below 50°F will feel a bit dry to some people, but comfortable to people accustomed to dry conditions; dew points from 50°F to 68°F are fairly comfortable to most people, and dew points above 68°F are increasingly uncomfortable, becoming oppressive around 77°F.
To take some examples, and basing our categorization on the daily high dew point in the last 12 months, January had 28 dry days, 3 comfortable days, and no humid days; April had 21 dry days, 9 comfortable days, and no humid days; July had no dry days, 14 comfortable days, and 17 humid days; and October had 17 dry days, 11 comfortable days, and 3 humid days.
The highest sustained wind speed was 40 mph, occurring on June 27; the highest daily mean wind speed was 21 mph (February 10); and the highest wind gust speed was 155 mph (January 22).
The windiest month was November, with an average wind speed of 10 mph. The least windy month was August, with an average wind speed of 6 mph.
Visibility is the maximum distance at which a given reference object or light can be clearly discerned. In the United States, visibilities that are greater than or equal to 10 miles are typically reported as 10 miles.
The day of the last 12 months with the lowest average visibility was February 26, with an average visibility of 2.8 mi. The month with the lowest average visibility was December, with an average visibility of 8.2 mi. With an average visibility of 9.9 mi, the month of July had the highest average visibility.
The cloud ceiling is the altitude of the lowest layer of clouds that are at categorized as broken (mostly cloudy) or overcast (cloudy). If no such cloud layer exists then the ceiling is unlimited and no value is reported.
The day of the last 12 months with the lowest average cloud ceiling was September 29, with an average cloud ceiling of 117'. The month with the lowest average cloud ceiling was December, with an average cloud ceiling of 3232'. The month of July has the highest average cloud ceiling, with an average cloud ceiling of 7138'.