This report describes the historical weather record at the Jacksonville International Airport (Jacksonville, Florida, United States) during 1956. This station has records back to December 1947.
Jacksonville, Florida 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 (50%), croplands (24%), oceans and seas (11%), built-up areas (7%), and lakes and rivers (5%)
Daylight saving time (DST) was observed at Jacksonville, Florida during 1956. There were two time changes during 1956:
1956 was a leap year and thus has 366 days rather than the normal 365. Leap years occur every fourth year and the extra day is always February 29th. In 1956 February 29th falls on a Wednesday.
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 1956 they occurred on:
|Spring Equinox||Tuesday, 20 March 1956.|
|Summer Solstice||Thursday, 21 June 1956.|
|Fall Equinox||Sunday, 23 September 1956.|
|Winter Solstice||Friday, 21 December 1956.|
The hottest day of 1956 was August 7, with a high temperature of 99°F. For reference, on that day the average high temperature is 90°F and the high temperature exceeds 94°F only one day in ten. The hottest month of 1956 was July with an average daily high temperature of 93°F.
Relative to the average, the hottest day was December 23. The high temperature that day was 83°F, compared to the average of 65°F, a difference of 18°F. In relative terms the warmest month was December, with an average high temperature of 72°F, compared to an typical value of 66°F.
The longest warm spell was from July 13 to August 4, constituting 23 consecutive days with warmer than average high temperatures. The month of February had the largest fraction of warmer than average days with 83% days with higher than average high temperatures.
The coldest day of 1956 was January 9, with a low temperature of 27°F. For reference, on that day the average low temperature is 42°F and the low temperature drops below 29°F only one day in ten. The coldest month of 1956 was January with an average daily low temperature of 39°F.
Relative to the average, the coldest day was November 28. The low temperature that day was 28°F, compared to the average of 48°F, a difference of 20°F. In relative terms the coldest month was January, with an average low temperature of 39°F, compared to an typical value of 42°F.
The longest cold spell was from November 22 to December 6, constituting 15 consecutive days with cooler than average low temperatures. The month of January had the largest fraction of cooler than average days with 71% days with lower than average low temperatures.
The clearest month of 1956 was November, with 80% of days being more clear than cloudy. The longest spell of clear weather was from May 10 to May 25, constituting 16 consecutive days that were clearer than they were cloudy.
The cloudiest month of 1956 was October, with 35% of days being more cloudy than clear. The longest spell of cloudy weather was from December 16 to December 22, constituting 7 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 October 16. That day saw 6.331" of liquid (or liquid equivalent) precipitation, compared to a median value of 0.168". The month with the most precipitation was October, with 13.476", compared to a median value of 2.573".
As determined by quantitative measurements, the longest dry spell was from March 17 to April 10, constituting 25 consecutive days with no measured precipitation. The month with the largest fraction of dry days was December, with 97% of days reporting no measured precipitation at all.
The month with the largest fraction of days with at least some measured precipitation was October, with 48% 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 1956 with the most precipitation observations was October 16. There were 23 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 October, with 106 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from May 11 to May 24, constituting 14 consecutive days with no observed precipitation. The month with the largest fraction of days without observed precipitation was December, with 84% of days reporting no observed precipitation at all.
The month with the largest fraction of days with at least some observed precipitation was July, with 55% of days reporting some observed precipitation.
Either snow is exceptionally rare at this location or this station did not reliably report it during 1956.
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 1956 was March with an average daily low humidity of 36%, and the most humid month was October with an average daily low humidity of 63%.
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 1956, January had 19 dry days, 12 comfortable days, and no humid days; April had 5 dry days, 19 comfortable days, and 6 humid days; July had no dry days, no comfortable days, and 31 humid days; and October had no dry days, 13 comfortable days, and 18 humid days.
The highest sustained wind speed was 35 mph, occurring on June 26; the highest daily mean wind speed was 22 mph (October 16);
The windiest month was April, with an average wind speed of 11 mph. The least windy month was August, with an average wind speed of 8 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 1956 with the lowest average visibility was December 20, with an average visibility of 0.3 mi. The month with the lowest average visibility was October, with an average visibility of 9.2 mi. With an average visibility of 12.4 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 1956 with the lowest average cloud ceiling was November 17, with an average cloud ceiling of 49'. The month with the lowest average cloud ceiling was November, with an average cloud ceiling of 2748'. The month of September has the highest average cloud ceiling, with an average cloud ceiling of 27431'.