Climate and Average Weather Year Round in Rosario de la Frontera Argentina

In Rosario de la Frontera, the wet season is warm, muggy, and partly cloudy and the dry season is comfortable and mostly clear. Over the course of the year, the temperature typically varies from 41°F to 85°F and is rarely below 30°F or above 94°F.

Based on the tourism score, the best times of year to visit Rosario de la Frontera for warm-weather activities are from late February to late April and from late September to late November.

The warm season lasts for 4.2 months, from October 10 to February 15, with an average daily high temperature above 80°F. The hottest month of the year in Rosario de la Frontera is December, with an average high of 84°F and low of 65°F.

The cool season lasts for 2.8 months, from May 10 to August 2, with an average daily high temperature below 68°F. The coldest month of the year in Rosario de la Frontera is July, with an average low of 41°F and high of 65°F.

In Rosario de la Frontera, 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 Rosario de la Frontera begins around July 4 and lasts for 5.1 months, ending around December 9.

The clearest month of the year in Rosario de la Frontera is September, during which on average the sky is clear, mostly clear, or partly cloudy 80% of the time.

The cloudier part of the year begins around December 9 and lasts for 6.9 months, ending around July 4.

The cloudiest month of the year in Rosario de la Frontera is January, during which on average the sky is overcast or mostly cloudy 42% of the time.

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

The wetter season lasts 5.0 months, from November 3 to April 4, with a greater than 28% chance of a given day being a wet day. The month with the most wet days in Rosario de la Frontera is January, with an average of 16.0 days with at least 0.04 inches of precipitation.

The drier season lasts 7.0 months, from April 4 to November 3. The month with the fewest wet days in Rosario de la Frontera is July, with an average of 1.2 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 Rosario de la Frontera is January, with an average of 16.0 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 53% on January 23.

Rainfall

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. Rosario de la Frontera experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 8.0 months, from September 21 to May 20, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Rosario de la Frontera is January, with an average rainfall of 7.5 inches.

The rainless period of the year lasts for 4.0 months, from May 20 to September 21. The month with the least rain in Rosario de la Frontera is July, with an average rainfall of 0.2 inches.

The length of the day in Rosario de la Frontera varies over the course of the year. In 2024, the shortest day is June 20, with 10 hours, 32 minutes of daylight; the longest day is December 21, with 13 hours, 45 minutes of daylight.

The earliest sunrise is at 6:20 AM on November 29, and the latest sunrise is 1 hour, 47 minutes later at 8:07 AM on July 3. The earliest sunset is at 6:36 PM on June 8, and the latest sunset is 1 hour, 40 minutes later at 8:16 PM on January 12.

Daylight saving time (DST) is not observed in Rosario de la Frontera during 2024.

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.

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.

Rosario de la Frontera experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 6.3 months, from October 27 to May 4, during which time the comfort level is muggy, oppressive, or miserable at least 19% of the time. The month with the most muggy days in Rosario de la Frontera is January, with 22.7 days that are muggy or worse.

The month with the fewest muggy days in Rosario de la Frontera is July, with 0.2 days that are muggy or worse.

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 Rosario de la Frontera experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.3 months, from August 16 to December 27, with average wind speeds of more than 7.7 miles per hour. The windiest month of the year in Rosario de la Frontera is October, with an average hourly wind speed of 9.0 miles per hour.

The calmer time of year lasts for 7.7 months, from December 27 to August 16. The calmest month of the year in Rosario de la Frontera is June, with an average hourly wind speed of 6.5 miles per hour.

The predominant average hourly wind direction in Rosario de la Frontera varies throughout the year.

The wind is most often from the north for 8.3 months, from January 17 to September 25, with a peak percentage of 45% on April 2. The wind is most often from the east for 3.7 months, from September 25 to January 17, with a peak percentage of 39% on January 1.

To characterize how pleasant the weather is in Rosario de la Frontera 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 times of year to visit Rosario de la Frontera for general outdoor tourist activities are from late February to late April and from late September to late November, with a peak score in the last week of March.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Rosario de la Frontera for hot-weather activities is from early November to mid February, with a peak score in the second week of December.

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).

The growing season in Rosario de la Frontera typically lasts for 10 months (310 days), from around August 12 to around June 18, rarely starting after September 8, or ending before May 25.

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.

Based on growing degree days alone, the first spring blooms in Rosario de la Frontera should appear around July 18, only rarely appearing before July 13 or after July 26.

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 significant seasonal variation over the course of the year.

The brighter period of the year lasts for 3.6 months, from October 12 to February 1, with an average daily incident shortwave energy per square meter above 7.0 kWh. The brightest month of the year in Rosario de la Frontera is November, with an average of 7.7 kWh.

The darker period of the year lasts for 3.0 months, from May 1 to August 1, with an average daily incident shortwave energy per square meter below 4.8 kWh. The darkest month of the year in Rosario de la Frontera is June, with an average of 4.1 kWh.

For the purposes of this report, the geographical coordinates of Rosario de la Frontera are -25.797 deg latitude, -64.971 deg longitude, and 2,582 ft elevation.

The topography within 2 miles of Rosario de la Frontera contains only modest variations in elevation, with a maximum elevation change of 282 feet and an average elevation above sea level of 2,596 feet. Within 10 miles contains only modest variations in elevation (3,150 feet). Within 50 miles contains large variations in elevation (11,112 feet).

The area within 2 miles of Rosario de la Frontera is covered by cropland (50%), trees (19%), grassland (16%), and shrubs (15%), within 10 miles by trees (45%) and cropland (28%), and within 50 miles by trees (57%) and shrubs (19%).