This report describes the historical weather record at the St. Petersburg-Clearwater International Airport (St. Petersburg, Florida, United States) during 2012. This station has records back to December 1972.
St. Petersburg, 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 oceans and seas (52%), croplands (31%), and built-up areas (14%)
Daylight saving time (DST) was observed at St. Petersburg, Florida during 2012. There were two time changes during 2012:
2012 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 2012 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 2012 they occurred on:
|Spring Equinox||Tuesday, 20 March 2012.|
|Summer Solstice||Wednesday, 20 June 2012.|
|Fall Equinox||Saturday, 22 September 2012.|
|Winter Solstice||Friday, 21 December 2012.|
The hottest day of 2012 was July 8, with a high temperature of 94°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 2012 was August with an average daily high temperature of 89°F.
Relative to the average, the hottest day was January 25. The high temperature that day was 82°F, compared to the average of 70°F, a difference of 12°F. In relative terms the warmest month was March, with an average high temperature of 82°F, compared to an typical value of 77°F.
The longest warm spell was from March 6 to April 19, constituting 45 consecutive days with warmer than average high temperatures. The month of March had the largest fraction of warmer than average days with 97% days with higher than average high temperatures.
The coldest day of 2012 was February 12, with a low temperature of 34°F. For reference, on that day the average low temperature is 56°F and the low temperature drops below 46°F only one day in ten. The coldest month of 2012 was January with an average daily low temperature of 53°F.
Relative to the average, the coldest day was February 12. The low temperature that day was 34°F, compared to the average of 56°F, a difference of 22°F. In relative terms the coldest month was November, with an average low temperature of 58°F, compared to an typical value of 63°F.
The longest cold spell was from July 10 to July 25, constituting 16 consecutive days with cooler than average low temperatures. The month of November had the largest fraction of cooler than average days with 87% days with lower than average low temperatures.
The clearest month of 2012 was January, with 84% of days being more clear than cloudy. The longest spell of clear weather was from October 4 to October 24, constituting 21 consecutive days that were clearer than they were cloudy.
The cloudiest month of 2012 was June, with 30% of days being more cloudy than clear. The longest spell of cloudy weather was from June 22 to June 28, 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 June 24. That day saw 8.083" of liquid (or liquid equivalent) precipitation, compared to a median value of 0.268". The month with the most precipitation was June, with 15.390", compared to a median value of 6.435".
As determined by quantitative measurements, the longest dry spell was from November 7 to December 10, constituting 34 consecutive days with no measured precipitation. The month with the largest fraction of dry days was November, 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 August, with 55% 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 2012 with the most precipitation observations was June 24. There were 19 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 August, with 90 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from November 9 to December 10, constituting 32 consecutive days with no observed precipitation. The month with the largest fraction of days without observed precipitation was November, with 93% of days reporting no observed precipitation at all.
The month with the largest fraction of days with at least some observed precipitation was August, with 74% of days reporting some observed precipitation.
Either snow is exceptionally rare at this location or this station did not reliably report it during 2012.
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 2012 was April with an average daily low humidity of 42%, and the most humid month was August with an average daily low humidity of 60%.
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 2012, January had 4 dry days, 27 comfortable days, and no humid days; April had 2 dry days, 18 comfortable days, and 10 humid days; July had no dry days, no comfortable days, and 31 humid days; and October had 1 dry day, 9 comfortable days, and 21 humid days.
The highest sustained wind speed was 34 mph, occurring on June 25; the highest daily mean wind speed was 26 mph (June 25); and the highest wind gust speed was 51 mph (June 25).
The windiest month was June, with an average wind speed of 9 mph. The least windy month was July, 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 2012 with the lowest average visibility was June 24, with an average visibility of 3.4 mi. The month with the lowest average visibility was February, with an average visibility of 9.3 mi. With an average visibility of 9.9 mi, the month of May 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 2012 with the lowest average cloud ceiling was November 2, with an average cloud ceiling of 174'. The month with the lowest average cloud ceiling was February, with an average cloud ceiling of 3624'. The month of September has the highest average cloud ceiling, with an average cloud ceiling of 6135'.