Average Weather in Rontu Indonesia
In Rontu, the wet season is overcast, the dry season is partly cloudy, and it is hot and oppressive year round. Over the course of the year, the temperature typically varies from 71°F to 92°F and is rarely below 68°F or above 95°F.
Based on the beach/pool score, the best time of year to visit Rontu for hot-weather activities is from early May to late October.
The temperature in Rontu varies so little throughout the year that it is not entirely meaningful to discuss hot and cold seasons.
Average High and Low Temperature
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
Octavio Paz, Mexico (10,306 miles away); Granada, Nicaragua (10,752 miles); and Maturín, Venezuela (12,292 miles) are the far-away foreign places with temperatures most similar to Rontu (view comparison).
In Rontu, 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 Rontu begins around April 28 and lasts for 6.0 months, ending around October 28. On August 15, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 51% of the time, and overcast or mostly cloudy 49% of the time.
The cloudier part of the year begins around October 28 and lasts for 6.0 months, ending around April 28. On January 21, the cloudiest day of the year, the sky is overcast or mostly cloudy 89% of the time, and clear, mostly clear, or partly cloudy 11% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Rontu varies very significantly throughout the year.
The wetter season lasts 5.0 months, from November 13 to April 12, with a greater than 28% chance of a given day being a wet day. The chance of a wet day peaks at 55% on February 6.
The drier season lasts 7.0 months, from April 12 to November 13. The smallest chance of a wet day is 1% on August 19.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 55% on February 6.
Daily Chance of Precipitation
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. Rontu experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 9.7 months, from September 18 to July 9, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around January 24, with an average total accumulation of 7.3 inches.
The rainless period of the year lasts for 2.3 months, from July 9 to September 18. The least rain falls around August 12, with an average total accumulation of 0.1 inches.
Average Monthly Rainfall
The length of the day in Rontu does not vary substantially over the course of the year, staying within 37 minutes of 12 hours throughout. In 2019, the shortest day is June 21, with 11 hours, 38 minutes of daylight; the longest day is December 22, with 12 hours, 37 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:34 AM on November 16, and the latest sunrise is 46 minutes later at 6:20 AM on July 15. The earliest sunset is at 5:52 PM on May 26, and the latest sunset is 40 minutes later at 6:32 PM on January 29.
Daylight saving time (DST) is not observed in Rontu during 2019.
Sunrise & Sunset with Twilight
Rontu experiences some seasonal variation in the perceived humidity.
The muggier period of the year lasts for 11 months, from August 31 to July 21, during which time the comfort level is muggy, oppressive, or miserable at least 92% of the time. The muggiest day of the year is February 10, with muggy conditions 100% of the time.
The least muggy day of the year is August 12, with muggy conditions 89% of the time.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Rontu experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 5.1 months, from May 13 to October 18, with average wind speeds of more than 7.8 miles per hour. The windiest day of the year is July 29, with an average hourly wind speed of 10.2 miles per hour.
The calmer time of year lasts for 6.9 months, from October 18 to May 13. The calmest day of the year is April 1, with an average hourly wind speed of 5.5 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Rontu varies throughout the year.
The wind is most often from the east for 5.6 months, from March 21 to September 9, with a peak percentage of 60% on May 29. The wind is most often from the south for 3.1 months, from September 9 to December 11, with a peak percentage of 55% on October 4. The wind is most often from the west for 3.3 months, from December 11 to March 21, with a peak percentage of 51% on January 1.
Rontu 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 2.0 months, from October 30 to December 30, with an average temperature above 84°F. The day of the year with the warmest water is November 24, with an average temperature of 85°F.
The time of year with cooler water lasts for 2.1 months, from July 13 to September 17, with an average temperature below 82°F. The day of the year with the coolest water is August 15, with an average temperature of 81°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Rontu 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 Rontu for general outdoor tourist activities is from mid June to mid September, with a peak score in the second week of August.
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 Rontu for hot-weather activities is from early May to late October, with a peak score in the first week of September.
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.
Temperatures in Rontu 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
Growing Degree Days
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 2.4 months, from August 20 to November 2, with an average daily incident shortwave energy per square meter above 6.6 kWh. The brightest day of the year is September 28, with an average of 7.1 kWh.
The darker period of the year lasts for 3.2 months, from December 5 to March 11, with an average daily incident shortwave energy per square meter below 4.9 kWh. The darkest day of the year is February 3, with an average of 4.3 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Rontu are -8.480 deg latitude, 118.754 deg longitude, and 335 ft elevation.
The topography within 2 miles of Rontu contains very significant variations in elevation, with a maximum elevation change of 1,024 feet and an average elevation above sea level of 305 feet. Within 10 miles contains very significant variations in elevation (4,199 feet). Within 50 miles also contains extreme variations in elevation (6,316 feet).
The area within 2 miles of Rontu is covered by cropland (43%), trees (28%), shrubs (18%), and grassland (12%), within 10 miles by trees (36%) and cropland (36%), and within 50 miles by water (72%) and trees (14%).
This report illustrates the typical weather in Rontu, 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, Sultan Muhammad Salahudin Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Rontu.
At a distance of 10 kilometers from Rontu, 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 Rontu 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.
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.
Time zones for aiports and weather stations are provided by AskGeo.com .