This report describes the historical weather record at the Memphis International Airport (Memphis, Tennessee, United States) during 1957. This station has records back to January 1948.
Memphis, Tennessee has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by forests (37%), croplands (34%), grasslands (16%), built-up areas (8%), and lakes and rivers (4%)
Daylight saving time (DST) was observed at Memphis, Tennessee during 1957. There were two time changes during 1957:
1957 was not a leap year, so it has 365 days and no February 29th. The first leap year before 1957 was 1956 and the first after was 1960.
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 1957 they occurred on:
|Spring Equinox||Wednesday, 20 March 1957.|
|Summer Solstice||Friday, 21 June 1957.|
|Fall Equinox||Monday, 23 September 1957.|
|Winter Solstice||Sunday, 22 December 1957.|
The hottest day of 1957 was July 15, with a high temperature of 97°F. For reference, on that day the average high temperature is 91°F and the high temperature exceeds 97°F only one day in ten. The hottest month of 1957 was July with an average daily high temperature of 89°F.
Relative to the average, the hottest day was January 9. The high temperature that day was 73°F, compared to the average of 48°F, a difference of 25°F. In relative terms the warmest month was December, with an average high temperature of 56°F, compared to an typical value of 52°F.
The longest warm spell was from April 17 to May 3, constituting 17 consecutive days with warmer than average high temperatures. The month of December had the largest fraction of warmer than average days with 74% days with higher than average high temperatures.
The coldest day of 1957 was January 17, with a low temperature of 11°F. For reference, on that day the average low temperature is 33°F and the low temperature drops below 19°F only one day in ten. The coldest month of 1957 was January with an average daily low temperature of 32°F.
Relative to the average, the coldest day was January 17. The low temperature that day was 11°F, compared to the average of 33°F, a difference of 22°F. In relative terms the coldest month was August, with an average low temperature of 69°F, compared to an typical value of 73°F.
The longest cold spell was from June 20 to July 22, constituting 33 consecutive days with cooler than average low temperatures. The month of July had the largest fraction of cooler than average days with 97% days with lower than average low temperatures.
The clearest month of 1957 was August, with 65% of days being more clear than cloudy. The longest spell of clear weather was from July 4 to July 14, constituting 11 consecutive days that were clearer than they were cloudy.
The cloudiest month of 1957 was January, with 58% of days being more cloudy than clear. The longest spell of cloudy weather was from January 26 to February 2, constituting 8 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 April 3. That day saw 2.760" of liquid (or liquid equivalent) precipitation, compared to a median value of 0.287". The month with the most precipitation was January, with 11.417", compared to a median value of 3.547".
As determined by quantitative measurements, the longest dry spell was from October 3 to October 15, constituting 13 consecutive days with no measured precipitation. The month with the largest fraction of dry days was October, with 74% 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 47% 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 1957 with the most precipitation observations was January 27. There were 24 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 January, with 176 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from October 4 to October 15, constituting 12 consecutive days with no observed precipitation. The month with the largest fraction of days without observed precipitation was August, with 68% 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 60% 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 1957 with the largest number of those reports was January, with a total of 175 reports. The day with the largest number of those reports was January 27, with a total of 24 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 1957 was on November 22; the last was on March 8. The month of 1957 with the largest number of those reports was March, with a total of 13 reports. The day with the largest number of those reports was March 7, with a total of 12 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 1957 was April with an average daily low humidity of 44%, and the most humid month was January with an average daily low humidity of 58%.
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 1957, January had 23 dry days, 8 comfortable days, and no humid days; April had 8 dry days, 15 comfortable days, and 7 humid days; July had no dry days, 2 comfortable days, and 29 humid days; and October had 10 dry days, 20 comfortable days, and 1 humid day.
The highest sustained wind speed was 35 mph, occurring on April 8; the highest daily mean wind speed was 21 mph (January 9);
The windiest month was December, with an average wind speed of 12 mph. The least windy month was July, with an average wind speed of 7 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 1957 with the lowest average visibility was January 28, with an average visibility of 1.5 mi. The month with the lowest average visibility was January, with an average visibility of 9.1 mi. With an average visibility of 13.9 mi, the month of May had the highest average visibility.
This station did not reliably report the cloud ceiling during 1957.