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December Weather in San Marcos Guatemala

Daily high temperatures are around 66°F, rarely falling below 63°F or exceeding 70°F.

Daily low temperatures decrease by 3°F, from 42°F to 40°F, rarely falling below 34°F or exceeding 47°F.

For reference, on March 31, the hottest day of the year, temperatures in San Marcos typically range from 44°F to 71°F, while on January 23, the coldest day of the year, they range from 39°F to 67°F.

Average High and Low Temperature in December in San Marcos

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 San Marcos

Average Hourly Temperature in December in San MarcosDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMNovJanvery coldcoldcoldcoolcoolcomfortable
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.

Matamba, Tanzania (8,766 miles away); Were Īlu, Ethiopia (8,670 miles); and Ooty, India (10,463 miles) are the far-away foreign places with temperatures most similar to San Marcos (view comparison).

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The month of December in San Marcos experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 48% to 29%.

The clearest day of the month is December 31, with clear, mostly clear, or partly cloudy conditions 71% of the time.

For reference, on June 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 95%, while on January 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 75%.

Cloud Cover Categories in December in San Marcos

Cloud Cover Categories in December in San MarcosDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanDec 152%Dec 152%Dec 3171%Dec 3171%Dec 1161%Dec 1161%Dec 2167%Dec 2167%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 San Marcos, the chance of a wet day over the course of December is very rapidly decreasing, starting the month at 12% and ending it at 3%.

For reference, the year's highest daily chance of a wet day is 75% on September 19, and its lowest chance is 3% on February 16.

Probability of Precipitation in December in San Marcos

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 San Marcos is decreasing, starting the month at 0.9 inches, when it rarely exceeds 2.6 inches or falls below -0.0 inches, and ending the month at 0.2 inches, when it rarely exceeds 0.5 inches or falls below -0.0 inches.

Average Monthly Rainfall in December in San Marcos

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 San Marcos, the length of the day is essentially constant. The shortest day of the month is December 20, with 11 hours, 15 minutes of daylight and the longest day is December 1, with 11 hours, 18 minutes of daylight.

Hours of Daylight and Twilight in December in San Marcos

Hours of Daylight and Twilight in December in San MarcosDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrNovJanDec 2111 hr, 15 minDec 2111 hr, 15 minnightnightdaydayDec 111 hr, 18 minDec 111 hr, 18 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 San Marcos is 6:17 AM on December 1 and the latest sunrise is 15 minutes later at 6:32 AM on December 31.

The earliest sunset is 5:35 PM on December 1 and the latest sunset is 13 minutes later at 5:48 PM on December 31.

Daylight saving time is not observed in San Marcos during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:38 AM and sets 13 hours, 1 minute later, at 6:39 PM, while on December 21, the shortest day of the year, it rises at 6:28 AM and sets 11 hours, 15 minutes later, at 5:42 PM.

Sunrise & Sunset with Twilight in December in San Marcos

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 San Marcos

Solar Elevation and Azimuth in December in San MarcosDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMNovJan001010202020303040405050500001010202030303040405050
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 San Marcos

Moon Rise, Set & Phases in December in San MarcosDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNovJanNov 16:48 AMNov 16:48 AMNov 153:29 PMNov 153:29 PMDec 112:22 AMDec 112:22 AMDec 153:02 AMDec 153:02 AMDec 304:28 PMDec 304:28 PMJan 134:28 PMJan 134:28 PMJan 296:37 AMJan 296:37 AM6:04 AM6:04 AM5:44 PM5:44 PM5:26 PM5:26 PM6:54 AM6:54 AM6:37 AM6:37 AM5:58 PM5:58 PM5:03 PM5:03 PM6:43 AM6:43 AM6:21 AM6:21 AM5:41 PM5:41 PM5:53 PM5:53 PM7:19 AM7:19 AM6:49 AM6:49 AM6:29 PM6:29 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%6:37 AMESE5:58 PMWSW-12:17 PMS245,274 mi
2
2%7:34 AMESE6:53 PMWSW-1:13 PMS243,188 mi
3
7%8:30 AMESE7:51 PMWSW-2:11 PMS241,054 mi
4
13%9:23 AMESE8:50 PMWSW-3:07 PMS238,908 mi
5
22%10:13 AMESE9:49 PMWSW-4:02 PMS236,769 mi
6
32%10:59 AMESE10:46 PMWSW-4:53 PMS234,654 mi
7
43%11:41 AMESE11:41 PMW-5:41 PMS232,603 mi
8
50%12:21 PME--6:28 PMS230,687 mi
9
66%-12:36 AMW1:01 PME7:15 PMS229,025 mi
10
77%-1:32 AMW1:42 PME8:04 PMS227,770 mi
11
86%-2:29 AMWNW2:25 PMENE8:55 PMN227,096 mi
12
94%-3:29 AMWNW3:12 PMENE9:50 PMN227,164 mi
13
98%-4:32 AMWNW4:05 PMENE10:50 PMN228,083 mi
14
100%-5:38 AMWNW5:03 PMENE11:53 PMN229,870 mi
15
100%-6:43 AMWNW6:05 PMENE--
16
99%-7:45 AMWNW7:08 PMENE12:56 AMN232,427 mi
17
95%-8:41 AMWNW8:09 PMENE1:56 AMN235,551 mi
18
89%-9:30 AMWNW9:06 PMENE2:51 AMN238,968 mi
19
82%-10:12 AMWNW9:59 PMENE3:41 AMN242,380 mi
20
73%-10:50 AMWNW10:48 PME4:26 AMS245,504 mi
21
64%-11:25 AMW11:35 PME5:08 AMS248,104 mi
22
50%-11:58 AMW-5:47 AMS250,000 mi
23
45%12:20 AME12:31 PMW-6:26 AMS251,083 mi
24
35%1:05 AME1:04 PMWSW-7:05 AMS251,313 mi
25
26%1:52 AMESE1:40 PMWSW-7:45 AMS250,719 mi
26
18%2:41 AMESE2:18 PMWSW-8:29 AMS249,392 mi
27
11%3:32 AMESE3:01 PMWSW-9:16 AMS247,472 mi
28
5%4:27 AMESE3:50 PMWSW-10:08 AMS245,142 mi
29
2%5:24 AMESE4:44 PMWSW-11:03 AMS242,599 mi
30
0%6:21 AMESE5:41 PMWSW-12:01 PMS240,044 mi
31
1%7:17 AMESE6:42 PMWSW-1:00 PMS237,649 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 San Marcos is essentially constant during December, remaining around 0% throughout.

For reference, on May 18, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in December in San Marcos

Humidity Comfort Levels in December in San MarcosDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%NovJanDec 10%Dec 10%Dec 310%Dec 310%Dec 110%Dec 110%Dec 210%Dec 210%comfortablecomfortabledrydryhumidhumid
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 San Marcos is essentially constant during December, remaining within 0.1 miles per hour of 3.4 miles per hour throughout.

For reference, on March 13, the windiest day of the year, the daily average wind speed is 3.8 miles per hour, while on July 24, the calmest day of the year, the daily average wind speed is 2.9 miles per hour.

Average Wind Speed in December in San Marcos

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 San Marcos throughout December is predominantly from the north, with a peak proportion of 44% on December 1.

Wind Direction in December in San Marcos

Wind Direction in December in San MarcosDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%NovJannorthsoutheastwest
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).

San Marcos is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in San Marcos is essentially constant during December, remaining around 84°F throughout.

Average Water Temperature in December in San Marcos

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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).

The growing season in San Marcos typically lasts for 11 months (330 days), from around January 31 to around December 27, rarely starting after March 25, or ending before November 26.

During December in San Marcos, the chance that a given day is within the growing season is rapidly decreasing falling from 86% to 44% over the course of the month.

Time Spent in Various Temperature Bands and the Growing Season in December in San Marcos

Time Spent in Various Temperature Bands and the Growing Season in December in San Marcosgrowing seasonDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJan86%Dec 186%Dec 1Dec 3144%Dec 3144%76%Dec 1176%Dec 1159%Dec 2159%Dec 21very coldcoldcoolcomfortable
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 San Marcos are gradually increasing during December, increasing by 155°F, from 2,227°F to 2,381°F, over the course of the month.

Growing Degree Days in December in San Marcos

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 San Marcos is essentially constant during December, remaining within 0.2 kWh of 5.2 kWh throughout.

Average Daily Incident Shortwave Solar Energy in December in San Marcos

Average Daily Incident Shortwave Solar Energy in December in San MarcosDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhNovJanDec 15.1 kWhDec 15.1 kWhDec 315.4 kWhDec 315.4 kWhDec 115.2 kWhDec 115.2 kWhDec 215.3 kWhDec 215.3 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 San Marcos are 14.964 deg latitude, -91.794 deg longitude, and 7,808 ft elevation.

The topography within 2 miles of San Marcos contains large variations in elevation, with a maximum elevation change of 2,041 feet and an average elevation above sea level of 7,921 feet. Within 10 miles contains large variations in elevation (11,184 feet). Within 50 miles also contains extreme variations in elevation (13,835 feet).

The area within 2 miles of San Marcos is covered by grassland (50%), cropland (26%), and trees (24%), within 10 miles by trees (45%) and grassland (39%), and within 50 miles by trees (37%) and grassland (33%).

This report illustrates the typical weather in San Marcos, 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 San Marcos.

For each station, the records are corrected for the elevation difference between that station and San Marcos 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 San Marcos is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between San Marcos 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 San Marcos 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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