This report describes the historical weather record at the San Joaquin Airport (San Joaquin, Bolivia) during the last 12 months. This station has records back to January 1948.
San Joaquin has a tropical savanna climate with dry winters. The area within 25 mi of this station is covered by grasslands (77%), forests (17%), and lakes and rivers (3%)
Daylight saving time (DST) was not observed at San Joaquin during the last 12 months.
2014 is not a leap year, so it has 365 days and no February 29th. The first leap year before 2014 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 2014 they occurred on:
|Spring Equinox||Tuesday, 23 September 2014.|
|Summer Solstice||Sunday, 21 December 2014.|
|Fall Equinox||Thursday, 20 March 2014.|
|Winter Solstice||Saturday, 21 June 2014.|
The hottest day of the last 12 months was September 21, with a high temperature of 99°F. For reference, on that day the average high temperature is 93°F and the high temperature exceeds 98°F only one day in ten. The hottest month of the last 12 months was September with an average daily high temperature of 93°F.
The longest warm spell was from August 29 to September 8, constituting 11 consecutive days with warmer than average high temperatures. The month of September had the largest fraction of warmer than average days with 70% days with higher than average high temperatures.
The coldest day of the last 12 months was July 25, with a low temperature of 54°F. For reference, on that day the average low temperature is 64°F and the low temperature drops below 56°F only one day in ten. The coldest month of the last 12 months was July with an average daily low temperature of 65°F.
The longest cold spell was from November 7 to November 19, constituting 13 consecutive days with cooler than average low temperatures. The month of November had the largest fraction of cooler than average days with 67% days with lower than average low temperatures.
This station did not reliably report the cloud coverage during the last 12 months but there is enough reported data to warrant the inclusion of the following graphs.
The cloudiest month of the last 12 months was February, with 54% of days being more cloudy than clear. The longest spell of cloudy weather was from December 19 to December 24, constituting 6 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 the last 12 months with the most precipitation observations was December 19. There were 10 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 December, with 47 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from June 10 to July 18, constituting 39 consecutive days with no observed precipitation. The month with the largest fraction of days without observed precipitation was June, with 97% of days reporting no observed precipitation at all.
The month with the largest fraction of days with at least some observed precipitation was February, with 46% of days reporting some observed precipitation.
Either snow is exceptionally rare at this location or this station did not reliably report it during the last 12 months.
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 September with an average daily low humidity of 46%, and the most humid month was January with an average daily low humidity of 74%.
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, October had no dry days, 1 comfortable day, and 30 humid days; January had no dry days, no comfortable days, and 31 humid days; April had no dry days, 1 comfortable day, and 29 humid days; and July had no dry days, 7 comfortable days, and 23 humid days.
The highest sustained wind speed was 23 mph, occurring on November 16; the highest daily mean wind speed was 19 mph (June 28); and the highest wind gust speed was 32 mph (May 23).
The windiest month was September, with an average wind speed of 6 mph. The least windy month was January, with an average wind speed of 5 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 December 18, with an average visibility of 2.9 mi. The month with the lowest average visibility was September, with an average visibility of 4.8 mi. With an average visibility of 6.2 mi, the month of August 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 December 19, with an average cloud ceiling of 823'. The month with the lowest average cloud ceiling was June, with an average cloud ceiling of 7055'. The month of August has the highest average cloud ceiling, with an average cloud ceiling of 18500'.