This report describes the historical weather record at the Orlando International Airport (Orlando, Florida, United States) during 1980. This station has records back to May 1952.
Orlando, 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 croplands (70%), forests (9%), lakes and rivers (8%), grasslands (8%), and built-up areas (4%)
Daylight saving time (DST) was observed at Orlando, Florida during 1980. There were two time changes during 1980:
1980 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 1980 February 29th falls on a Friday.
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 1980 they occurred on:
|Spring Equinox||Thursday, 20 March 1980.|
|Summer Solstice||Saturday, 21 June 1980.|
|Fall Equinox||Monday, 22 September 1980.|
|Winter Solstice||Sunday, 21 December 1980.|
The hottest day of 1980 was August 22, 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 1980 was July with an average daily high temperature of 93°F.
Relative to the average, the hottest day was October 28. The high temperature that day was 91°F, compared to the average of 81°F, a difference of 10°F. In relative terms the warmest month was July, with an average high temperature of 93°F, compared to an typical value of 91°F.
The longest warm spell was from September 13 to October 1, constituting 19 consecutive days with warmer than average high temperatures. The month of September had the largest fraction of warmer than average days with 80% days with higher than average high temperatures.
The coldest day of 1980 was March 3, with a low temperature of 25°F. For reference, on that day the average low temperature is 54°F and the low temperature drops below 44°F only one day in ten. The coldest month of 1980 was February with an average daily low temperature of 45°F.
Relative to the average, the coldest day was March 3. The low temperature that day was 25°F, compared to the average of 54°F, a difference of 29°F. In relative terms the coldest month was February, with an average low temperature of 45°F, compared to an typical value of 52°F.
The longest cold spell was from January 28 to February 14, constituting 18 consecutive days with cooler than average low temperatures. The month of December had the largest fraction of cooler than average days with 81% days with lower than average low temperatures.
The clearest month of 1980 was December, with 45% of days being more clear than cloudy. The longest spell of clear weather was from June 14 to June 19, constituting 6 consecutive days that were clearer than they were cloudy.
The cloudiest month of 1980 was November, with 50% of days being more cloudy than clear. The longest spell of cloudy weather was from December 21 to December 30, constituting 10 consecutive days that were cloudier than they were clear.
This station provides hourly reports of significant weather events at and around the station, but does not report the quantity of precipitation at the station itself. This is common for weather stations located outside of the United States, and for a small subset of stations in the United States that are located at lesser used and smaller airports.
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 1980 with the most precipitation observations was November 17. There were 15 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 November, with 61 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from October 8 to October 18, constituting 11 consecutive days with no observed precipitation. The month with the largest fraction of days without observed precipitation was March, with 74% 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 52% of days reporting some observed precipitation.
Either snow is exceptionally rare at this location or this station did not reliably report it during 1980.
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 1980 was April with an average daily low humidity of 43%, and the most humid month was September 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 1980, January had 5 dry days, 23 comfortable days, and 3 humid days; April had no dry days, 20 comfortable days, and 10 humid days; July had no dry days, no comfortable days, and 31 humid days; and October had no dry days, 8 comfortable days, and 23 humid days.
The highest sustained wind speed was 32 mph, occurring on March 2; the highest daily mean wind speed was 19 mph (March 2); and the highest wind gust speed was 41 mph (July 24).
The windiest month was March, with an average wind speed of 11 mph. The least windy month was September, 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 1980 with the lowest average visibility was January 13, with an average visibility of 2.7 mi. The month with the lowest average visibility was June, with an average visibility of 8.2 mi. With an average visibility of 9.8 mi, the month of September 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 1980 with the lowest average cloud ceiling was March 7, with an average cloud ceiling of 49'. The month with the lowest average cloud ceiling was December, with an average cloud ceiling of 9905'. The month of September has the highest average cloud ceiling, with an average cloud ceiling of 18660'.