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Climate and Average Weather Year Round in San Julian Bolivia

In San Julian, the summers are long, hot, oppressive, wet, and mostly cloudy and the winters are short, comfortable, humid, and partly cloudy. Over the course of the year, the temperature typically varies from 60°F to 88°F and is rarely below 49°F or above 95°F.

Based on the tourism score, the best time of year to visit San Julian for warm-weather activities is from late April to mid September.

Climate in San Julian

hotwarmhotJanFebMarAprMayJunJulAugSepOctNovDecNowNow70%70%23%23%clearovercastprecipitation: 6.4 inprecipitation: 6.4 in1.4 in1.4 inmuggy: 95%muggy: 95%26%26%drydrytourism score: 6.6tourism score: 6.63.93.9
San Julian weather by month. Click on each chart for more information.

The hot season lasts for 6.2 months, from September 16 to March 22, with an average daily high temperature above 86°F. The hottest month of the year in San Julian is January, with an average high of 87°F and low of 73°F.

The cool season lasts for 2.4 months, from May 14 to July 26, with an average daily high temperature below 79°F. The coldest month of the year in San Julian is July, with an average low of 61°F and high of 78°F.

Average High and Low Temperature in San Julian

Average High and Low Temperature in San JulianhothotcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJul 1978°FJul 1978°FNov 1988°FNov 1988°F60°F60°F71°F71°FSep 1686°FSep 1686°FMar 2286°FMar 2286°FMay 1479°FMay 1479°F66°F66°F71°F71°F65°F65°FNowNow
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.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 87°F87°F86°F84°F79°F77°F78°F83°F86°F88°F88°F87°F
Temp. 79°F78°F78°F75°F71°F68°F68°F72°F75°F78°F78°F79°F
Low 73°F72°F71°F68°F64°F62°F61°F63°F66°F69°F71°F72°F

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, 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 San Julian

Average Hourly Temperature in San JulianJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowcoolcomfortablecomfortablewarmhothotwarmwarm
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.

Ángel Albino Corzo (Guadalupe), Mexico (3,181 miles away) is the far-away foreign place with temperatures most similar to San Julian (view comparison).

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In San Julian, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in San Julian begins around April 12 and lasts for 6.0 months, ending around October 13.

The clearest month of the year in San Julian is August, during which on average the sky is clear, mostly clear, or partly cloudy 69% of the time.

The cloudier part of the year begins around October 13 and lasts for 6.0 months, ending around April 12.

The cloudiest month of the year in San Julian is February, during which on average the sky is overcast or mostly cloudy 76% of the time.

Cloud Cover Categories in San Julian

Cloud Cover Categories in San JulianclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 1870%Aug 1870%Feb 623%Feb 623%Apr 1246%Apr 1246%Oct 1346%Oct 1346%NowNowclearpartly cloudymostly cloudyovercastmostly clear
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.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 75%76%66%53%45%42%34%31%39%55%62%71%
Clearer 25%24%34%47%55%58%66%69%61%45%38%29%

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in San Julian varies significantly throughout the year.

The wetter season lasts 5.4 months, from October 25 to April 7, with a greater than 32% chance of a given day being a wet day. The month with the most wet days in San Julian is February, with an average of 14.4 days with at least 0.04 inches of precipitation.

The drier season lasts 6.6 months, from April 7 to October 25. The month with the fewest wet days in San Julian is August, with an average of 4.2 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in San Julian is February, with an average of 14.4 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 52% on February 8.

Daily Chance of Precipitation in San Julian

Daily Chance of Precipitation in San JulianwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 852%Feb 852%Aug 112%Aug 112%Oct 2532%Oct 2532%Apr 732%Apr 732%NowNowrain
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).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 15.3d14.4d13.0d9.0d8.2d6.5d4.5d4.2d5.8d8.7d10.9d14.3d

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. San Julian experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in San Julian. The month with the most rain in San Julian is January, with an average rainfall of 6.3 inches.

The month with the least rain in San Julian is August, with an average rainfall of 1.4 inches.

Average Monthly Rainfall in San Julian

Average Monthly Rainfall in San JulianJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 inJan 266.4 inJan 266.4 inAug 121.4 inAug 121.4 inNowNow
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.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 6.3″6.0″4.6″3.4″3.2″2.4″1.6″1.4″2.4″3.4″4.6″6.0″

The length of the day in San Julian varies over the course of the year. In 2024, the shortest day is June 20, with 11 hours, 4 minutes of daylight; the longest day is December 21, with 13 hours, 12 minutes of daylight.

Hours of Daylight and Twilight in San Julian

Hours of Daylight and Twilight in San JulianJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minSep 2212 hr, 6 minSep 2213 hr, 12 minDec 2113 hr, 12 minDec 2112 hr, 7 minMar 1912 hr, 7 minMar 1911 hr, 4 minJun 2011 hr, 4 minJun 20daydaynightNowNow
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.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 13.1h12.7h12.2h11.7h11.3h11.1h11.2h11.5h12.0h12.5h13.0h13.2h

The earliest sunrise is at 5:26 AM on November 23, and the latest sunrise is 1 hour, 17 minutes later at 6:43 AM on July 6. The earliest sunset is at 5:43 PM on June 3, and the latest sunset is 1 hour, 10 minutes later at 6:53 PM on January 18.

Daylight saving time (DST) is not observed in San Julian during 2024.

Sunrise & Sunset with Twilight in San Julian

Sunrise & Sunset with Twilight in San JulianJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMNov 235:26 AMNov 235:26 AM6:53 PMJan 186:53 PMJan 18Jun 35:43 PMJun 35:43 PM6:43 AMJul 66:43 AMJul 6daySolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. 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 San Julian

Solar Elevation and Azimuth in San JulianJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM000010101010202020203030303040404040505050606070708000001010101020202020303030304040404050505050606060707080804990NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 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 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.

Moon Rise, Set & Phases in San Julian

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.

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.

San Julian experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 8.6 months, from September 18 to June 4, during which time the comfort level is muggy, oppressive, or miserable at least 43% of the time. The month with the most muggy days in San Julian is January, with 29.3 days that are muggy or worse.

The month with the fewest muggy days in San Julian is July, with 9.3 days that are muggy or worse.

Humidity Comfort Levels in San Julian

Humidity Comfort Levels in San JulianmuggymuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 2926%Jul 2926%95%Jan 1095%Jan 10Sep 1843%Sep 1843%Jun 443%Jun 443%NowNowoppressiveoppressivemuggymuggydrydrymiserablemiserablecomfortablecomfortable
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.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 29.3d27.2d27.5d21.9d16.1d12.3d9.3d9.6d13.0d20.6d23.9d28.6d

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 Julian experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 8.4 months, from May 30 to February 9, with average wind speeds of more than 8.8 miles per hour. The windiest month of the year in San Julian is September, with an average hourly wind speed of 9.6 miles per hour.

The calmer time of year lasts for 3.6 months, from February 9 to May 30. The calmest month of the year in San Julian is March, with an average hourly wind speed of 8.0 miles per hour.

Average Wind Speed in San Julian

Average Wind Speed in San JulianwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mphSep 219.7 mphSep 219.7 mphMar 177.8 mphMar 177.8 mphMay 308.8 mphMay 308.8 mphFeb 98.8 mphFeb 98.8 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 9.08.68.08.38.59.19.49.59.69.59.49.3

The predominant average hourly wind direction in San Julian is from the north throughout the year.

Wind Direction in San Julian

Wind Direction in San JulianJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowsouthnortheastwest
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).

To characterize how pleasant the weather is in San Julian throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit San Julian for general outdoor tourist activities is from late April to mid September, with a peak score in the third week of July.

Tourism Score in San Julian

Tourism Score in San Julianbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.66.63.93.9NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationtourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best times of year to visit San Julian for hot-weather activities are from early March to mid May and from early August to mid December, with a peak score in the second week of April.

Beach/Pool Score in San Julian

Beach/Pool Score in San Julianbest timebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.75.74.44.45.75.74.84.8NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationbeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

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).

Temperatures in San Julian are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season in San Julian

Time Spent in Various Temperature Bands and the Growing Season in San JulianJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%100%Jan 1100%Jan 1100%Jul 2100%Jul 2NowNowcoldcoolcomfortablewarmhot
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.

Growing Degree Days in San Julian

Growing Degree Days in San JulianJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F1,000°F1,000°F2,000°F2,000°F3,000°F3,000°F4,000°F4,000°F5,000°F5,000°F6,000°F6,000°F7,000°F7,000°F8,000°F8,000°F9,000°F9,000°FJul 690°FJul 690°FAug 17900°FAug 17900°FSep 241,800°FSep 241,800°FJun 308,928°FJun 308,928°FNowNow
The average growing degree days accumulated over the course of the year, 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 experiences some seasonal variation over the course of the year.

The brighter period of the year lasts for 4.6 months, from October 22 to March 9, with an average daily incident shortwave energy per square meter above 6.3 kWh. The brightest month of the year in San Julian is January, with an average of 6.7 kWh.

The darker period of the year lasts for 2.4 months, from May 13 to July 26, with an average daily incident shortwave energy per square meter below 4.9 kWh. The darkest month of the year in San Julian is June, with an average of 4.5 kWh.

Average Daily Incident Shortwave Solar Energy in San Julian

Average Daily Incident Shortwave Solar Energy in San JulianbrightbrightdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJan 206.7 kWhJan 206.7 kWhJun 204.4 kWhJun 204.4 kWhOct 226.3 kWhOct 226.3 kWhMar 96.3 kWhMar 96.3 kWhMay 134.9 kWhMay 134.9 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 6.76.56.15.54.84.54.75.25.66.16.66.6

For the purposes of this report, the geographical coordinates of San Julian are -17.783 deg latitude, -62.867 deg longitude, and 1,089 ft elevation.

The topography within 2 miles of San Julian is essentially flat, with a maximum elevation change of 95 feet and an average elevation above sea level of 1,087 feet. Within 10 miles is essentially flat (312 feet). Within 50 miles contains only modest variations in elevation (4,803 feet).

The area within 2 miles of San Julian is covered by cropland (86%), within 10 miles by cropland (69%) and trees (16%), and within 50 miles by cropland (52%) and trees (30%).

This report illustrates the typical weather in San Julian, 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 is only a single weather station, Viru Viru International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of San Julian.

At a distance of 32 kilometers from San Julian, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

The station records are corrected for the elevation difference between the station and San Julian according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

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.

Please review our full terms contained on our Terms of Service page.