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December Weather in General José de San Martín Argentina

Daily high temperatures increase by 3°F, from 89°F to 92°F, rarely falling below 80°F or exceeding 100°F.

Daily low temperatures increase by 3°F, from 68°F to 70°F, rarely falling below 59°F or exceeding 77°F.

For reference, on January 15, the hottest day of the year, temperatures in General José de San Martín typically range from 71°F to 93°F, while on July 20, the coldest day of the year, they range from 51°F to 72°F.

Average High and Low Temperature in December in General José de San Martín

Average High and Low Temperature in December in General José de San MartínDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313155°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°F100°F100°FNovJanDec 189°FDec 189°F68°F68°FDec 3192°FDec 3192°F70°F70°FDec 1190°FDec 1190°F69°F69°FDec 2191°FDec 2191°F70°F70°F
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in December in General José de San Martín

Average Hourly Temperature in December in General José de San MartínDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJancomfortablecomfortablewarmwarmhot
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

San Pedro Garza Garcia, Mexico (4,531 miles away) and Gibsonia, Florida, United States (4,068 miles) are the far-away foreign places with temperatures most similar to General José de San Martín (view comparison).

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The month of December in General José de San Martín experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 37% to 41%.

The clearest day of the month is December 10, with clear, mostly clear, or partly cloudy conditions 64% of the time.

For reference, on January 11, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 43%, while on August 31, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 72%.

Cloud Cover Categories in December in General José de San Martín

Cloud Cover Categories in December in General José de San MartínDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanDec 163%Dec 163%Dec 3159%Dec 3159%Dec 1164%Dec 1164%Dec 2161%Dec 2161%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In General José de San Martín, the chance of a wet day over the course of December is gradually decreasing, starting the month at 39% and ending it at 36%.

For reference, the year's highest daily chance of a wet day is 41% on January 31, and its lowest chance is 12% on August 9.

Probability of Precipitation in December in General José de San Martín

Probability of Precipitation in December in General José de San MartínDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%45%45%NovJanDec 2235%Dec 2235%Dec 139%Dec 139%Dec 3136%Dec 3136%Dec 1137%Dec 1137%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during December in General José de San Martín is decreasing, starting the month at 6.3 inches, when it rarely exceeds 10.3 inches or falls below 3.0 inches, and ending the month at 5.6 inches, when it rarely exceeds 9.0 inches or falls below 2.5 inches.

Average Monthly Rainfall in December in General José de San Martín

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Over the course of December in General José de San Martín, the length of the day is essentially constant. The shortest day of the month is December 1, with 13 hours, 41 minutes of daylight and the longest day is December 21, with 13 hours, 49 minutes of daylight.

Hours of Daylight and Twilight in December in General José de San Martín

Hours of Daylight and Twilight in December in General José de San MartínDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrNovJanDec 2113 hr, 49 minDec 2113 hr, 49 mindaydaydaydaynightDec 113 hr, 41 minDec 113 hr, 41 min
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the month in General José de San Martín is 5:56 AM on December 1 and the latest sunrise is 11 minutes later at 6:07 AM on December 31.

The earliest sunset is 7:37 PM on December 1 and the latest sunset is 17 minutes later at 7:53 PM on December 31.

Daylight saving time is not observed in General José de San Martín during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 6:01 AM and sets 13 hours, 49 minutes later, at 7:50 PM, while on June 20, the shortest day of the year, it rises at 7:44 AM and sets 10 hours, 28 minutes later, at 6:13 PM.

Sunrise & Sunset with Twilight in December in General José de San Martín

The solar day over the course of December. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in December in General José de San Martín

Solar Elevation and Azimuth in December in General José de San MartínDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJan00101020202030304040505050606070708080000101020203030304040505060606070708080
northeastsouthwest
Solar elevation and azimuth over the course of December 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for December 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in December in General José de San Martín

Moon Rise, Set & Phases in December in General José de San MartínDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNovJanNov 19:48 AMNov 19:48 AMNov 156:29 PMNov 156:29 PMDec 13:22 AMDec 13:22 AMDec 156:02 AMDec 156:02 AMDec 307:28 PMDec 307:28 PMJan 137:28 PMJan 137:28 PMJan 299:37 AMJan 299:37 AM5:56 AM5:56 AM7:34 PM7:34 PM7:28 PM7:28 PM6:13 AM6:13 AM5:50 AM5:50 AM8:20 PM8:20 PM7:25 PM7:25 PM5:48 AM5:48 AM5:26 AM5:26 AM8:04 PM8:04 PM8:07 PM8:07 PM6:42 AM6:42 AM6:20 AM6:20 AM8:18 PM8:18 PM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Dec 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
0%5:50 AMESE8:20 PMWSW-1:04 PMS245,456 mi
2
2%6:40 AMESE9:18 PMWSW-1:59 PMS243,379 mi
3
6%7:36 AMESE10:12 PMWSW-2:55 PMS241,248 mi
4
13%8:37 AMESE11:00 PMWSW-3:51 PMN239,104 mi
5
21%9:40 AMESE11:44 PMWSW-4:45 PMN236,964 mi
6
31%10:44 AMESE--5:36 PMN234,847 mi
7
42%-12:22 AMWSW11:46 AMESE6:24 PMN232,788 mi
8
50%-12:57 AMW12:48 PME7:11 PMN230,856 mi
9
65%-1:30 AMW1:50 PME7:58 PMN229,164 mi
10
76%-2:04 AMW2:52 PME8:46 PMN227,864 mi
11
85%-2:39 AMWNW3:58 PMENE9:37 PMN227,129 mi
12
93%-3:17 AMWNW5:06 PMENE10:33 PMN227,124 mi
13
98%-4:01 AMWNW6:16 PMENE11:33 PMN227,963 mi
14
99%-4:51 AMWNW7:25 PMENE--
15
100%-5:48 AMWNW8:30 PMENE12:37 AMN229,674 mi
16
99%-6:51 AMWNW9:28 PMENE1:41 AMN232,170 mi
17
96%-7:56 AMWNW10:17 PMENE2:42 AMN235,256 mi
18
90%-9:00 AMWNW10:58 PMENE3:39 AMN238,660 mi
19
83%-10:00 AMWNW11:33 PMENE4:30 AMN242,086 mi
20
74%-10:57 AMWNW-5:15 AMN245,246 mi
21
65%12:04 AME11:51 AMW-5:57 AMN247,901 mi
22
50%12:33 AME12:42 PMW-6:37 AMN249,864 mi
23
45%1:00 AME1:33 PMW-7:15 AMN251,022 mi
24
36%1:27 AME2:25 PMWSW-7:54 AMN251,327 mi
25
27%1:56 AMESE3:18 PMWSW-8:34 AMN250,803 mi
26
19%2:27 AMESE4:13 PMWSW-9:17 AMN249,536 mi
27
12%3:03 AMESE5:10 PMWSW-10:04 AMN247,663 mi
28
6%3:44 AMESE6:09 PMWSW-10:55 AMN245,361 mi
29
2%4:32 AMESE7:08 PMWSW-11:49 AMS242,831 mi
30
0%5:26 AMESE8:04 PMWSW-12:46 PMS240,271 mi
31
1%6:27 AMESE8:56 PMWSW-1:43 PMS237,857 mi

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in General José de San Martín is rapidly increasing during December, rising from 62% to 77% over the course of the month.

For reference, on January 25, the muggiest day of the year, there are muggy conditions 83% of the time, while on August 4, the least muggy day of the year, there are muggy conditions 5% of the time.

Humidity Comfort Levels in December in General José de San Martín

Humidity Comfort Levels in December in General José de San MartínDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%NovJanDec 162%Dec 162%Dec 3177%Dec 3177%Dec 1168%Dec 1168%Dec 2174%Dec 2174%miserablemiserableoppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in General José de San Martín is essentially constant during December, remaining within 0.2 miles per hour of 4.7 miles per hour throughout.

For reference, on September 7, the windiest day of the year, the daily average wind speed is 5.6 miles per hour, while on March 18, the calmest day of the year, the daily average wind speed is 4.3 miles per hour.

Average Wind Speed in December in General José de San Martín

Average Wind Speed in December in General José de San MartínDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mphNovJanDec 14.9 mphDec 14.9 mphDec 314.5 mphDec 314.5 mphDec 114.8 mphDec 114.8 mphDec 214.6 mphDec 214.6 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in General José de San Martín throughout December is predominantly from the east, with a peak proportion of 48% on December 1.

Wind Direction in December in General José de San Martín

Wind Direction in December in General José de San MartínDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%NovJansoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

While it does not do so every year, freezing temperatures are seen in General José de San Martín over some winters. The day least likely to be in the growing season is July 15, with a 52% chance.

Time Spent in Various Temperature Bands and the Growing Season in December in General José de San Martín

Time Spent in Various Temperature Bands and the Growing Season in December in General José de San MartínDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJan100%Dec 16100%Dec 16coolcomfortablewarmhotsweltering
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in General José de San Martín are rapidly increasing during December, increasing by 833°F, from 2,738°F to 3,571°F, over the course of the month.

Growing Degree Days in December in General José de San Martín

Growing Degree Days in December in General José de San MartínDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031312,600°F2,600°F2,800°F2,800°F3,000°F3,000°F3,200°F3,200°F3,400°F3,400°F3,600°F3,600°F3,800°F3,800°FNovJanDec 12,738°FDec 12,738°FDec 313,571°FDec 313,571°FDec 113,008°FDec 113,008°FDec 213,285°FDec 213,285°F
The average growing degree days accumulated over the course of December, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in General José de San Martín is essentially constant during December, remaining around 7.2 kWh throughout.

The highest average daily incident shortwave solar energy during December is 7.3 kWh on December 29.

Average Daily Incident Shortwave Solar Energy in December in General José de San Martín

Average Daily Incident Shortwave Solar Energy in December in General José de San MartínDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhNovJanDec 297.3 kWhDec 297.3 kWhDec 17.2 kWhDec 17.2 kWhDec 117.3 kWhDec 117.3 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of General José de San Martín are -26.537 deg latitude, -59.342 deg longitude, and 266 ft elevation.

The topography within 2 miles of General José de San Martín is essentially flat, with a maximum elevation change of 49 feet and an average elevation above sea level of 253 feet. Within 10 miles is essentially flat (98 feet). Within 50 miles also contains only modest variations in elevation (190 feet).

The area within 2 miles of General José de San Martín is covered by cropland (29%), trees (25%), shrubs (22%), and grassland (22%), within 10 miles by trees (45%) and shrubs (22%), and within 50 miles by trees (55%) and shrubs (25%).

This report illustrates the typical weather in General José de San Martín, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in General José de San Martín.

For each station, the records are corrected for the elevation difference between that station and General José de San Martín according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at General José de San Martín is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between General José de San Martín and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of General José de San Martín and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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