Climate and Average Weather Year Round in Dieciocho de Julio Uruguay

In Dieciocho de Julio, the summers are warm and humid, the winters are cool and windy, and it is wet and partly cloudy year round. Over the course of the year, the temperature typically varies from 47°F to 81°F and is rarely below 38°F or above 88°F.

Based on the tourism score, the best time of year to visit Dieciocho de Julio for warm-weather activities is from late October to mid April.

The warm season lasts for 3.6 months, from December 6 to March 25, with an average daily high temperature above 77°F. The hottest month of the year in Dieciocho de Julio is January, with an average high of 81°F and low of 67°F.

The cool season lasts for 3.6 months, from May 28 to September 16, with an average daily high temperature below 64°F. The coldest month of the year in Dieciocho de Julio is July, with an average low of 47°F and high of 60°F.

In Dieciocho de Julio, 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 Dieciocho de Julio begins around October 5 and lasts for 6.4 months, ending around April 16.

The clearest month of the year in Dieciocho de Julio is January, during which on average the sky is clear, mostly clear, or partly cloudy 67% of the time.

The cloudier part of the year begins around April 16 and lasts for 5.6 months, ending around October 5.

The cloudiest month of the year in Dieciocho de Julio is June, during which on average the sky is overcast or mostly cloudy 51% of the time.

Dieciocho de Julio does not experience significant seasonal variation in the frequency of wet days (i.e., those with greater than 0.04 inches of liquid or liquid-equivalent precipitation). The frequency ranges from 23% to 33%, with an average value of 27%.

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 Dieciocho de Julio is February, with an average of 9.1 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 33% on February 12.

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. Dieciocho de Julio experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Dieciocho de Julio. The month with the most rain in Dieciocho de Julio is April, with an average rainfall of 4.4 inches.

The month with the least rain in Dieciocho de Julio is December, with an average rainfall of 3.0 inches.

The length of the day in Dieciocho de Julio varies significantly over the course of the year. In 2024, the shortest day is June 20, with 9 hours, 55 minutes of daylight; the longest day is December 21, with 14 hours, 24 minutes of daylight.

The earliest sunrise is at 5:16 AM on December 5, and the latest sunrise is 2 hours, 23 minutes later at 7:39 AM on June 29. The earliest sunset is at 5:32 PM on June 11, and the latest sunset is 2 hours, 16 minutes later at 7:48 PM on January 7.

Daylight saving time (DST) is not observed in Dieciocho de Julio 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.

Dieciocho de Julio experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 5.2 months, from November 18 to April 24, during which time the comfort level is muggy, oppressive, or miserable at least 15% of the time. The month with the most muggy days in Dieciocho de Julio is February, with 17.1 days that are muggy or worse.

The month with the fewest muggy days in Dieciocho de Julio is July, with 0.1 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 Dieciocho de Julio experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.0 months, from August 18 to February 19, with average wind speeds of more than 10.3 miles per hour. The windiest month of the year in Dieciocho de Julio is September, with an average hourly wind speed of 11.0 miles per hour.

The calmer time of year lasts for 6.0 months, from February 19 to August 18. The calmest month of the year in Dieciocho de Julio is May, with an average hourly wind speed of 9.7 miles per hour.

The predominant average hourly wind direction in Dieciocho de Julio varies throughout the year.

The wind is most often from the north for 1.2 months, from April 19 to May 25 and for 1.5 months, from July 12 to August 28, with a peak percentage of 29% on August 9. The wind is most often from the west for 1.6 months, from May 25 to July 12, with a peak percentage of 32% on June 14. The wind is most often from the east for 7.7 months, from August 28 to April 19, with a peak percentage of 48% on January 1.

Dieciocho de Julio 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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.8 months, from December 19 to April 11, with an average temperature above 70°F. The month of the year in Dieciocho de Julio with the warmest water is February, with an average temperature of 73°F.

The time of year with cooler water lasts for 3.5 months, from June 17 to October 1, with an average temperature below 58°F. The month of the year in Dieciocho de Julio with the coolest water is August, with an average temperature of 54°F.

To characterize how pleasant the weather is in Dieciocho de Julio 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 Dieciocho de Julio for general outdoor tourist activities is from late October to mid April, with a peak score in the first week of December.

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 Dieciocho de Julio for hot-weather activities is from late December to early March, with a peak score in the second week of January.

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 Dieciocho de Julio 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.

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.

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 extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.1 months, from November 5 to February 7, with an average daily incident shortwave energy per square meter above 6.7 kWh. The brightest month of the year in Dieciocho de Julio is December, with an average of 7.8 kWh.

The darker period of the year lasts for 3.6 months, from April 29 to August 17, with an average daily incident shortwave energy per square meter below 3.5 kWh. The darkest month of the year in Dieciocho de Julio is June, with an average of 2.5 kWh.

For the purposes of this report, the geographical coordinates of Dieciocho de Julio are -33.682 deg latitude, -53.553 deg longitude, and 43 ft elevation.

The topography within 2 miles of Dieciocho de Julio contains only modest variations in elevation, with a maximum elevation change of 367 feet and an average elevation above sea level of 57 feet. Within 10 miles also contains only modest variations in elevation (479 feet). Within 50 miles contains only modest variations in elevation (758 feet).

The area within 2 miles of Dieciocho de Julio is covered by grassland (91%), within 10 miles by grassland (74%) and cropland (12%), and within 50 miles by water (42%) and grassland (38%).