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Winter Weather in Rongelap Marshall Islands

Daily high temperatures are around 81°F, rarely falling below 79°F or exceeding 84°F. The lowest daily average high temperature is 80°F on February 21.

Daily low temperatures are around 81°F, rarely falling below 78°F or exceeding 83°F. The lowest daily average low temperature is 80°F on February 21.

For reference, on October 11, the hottest day of the year, temperatures in Rongelap typically range from 82°F to 83°F, while on February 14, the coldest day of the year, they range from 80°F to 80°F.

Average High and Low Temperature in the Winter in Rongelap

Average High and Low Temperature in the Winter in RongelapDecJanFeb78°F78°F80°F80°F82°F82°F84°F84°F86°F86°F88°F88°F90°F90°F92°F92°FFallSpringFeb 1980°FFeb 1980°F80°F80°FDec 182°FDec 182°F82°F82°FJan 181°FJan 181°F80°F80°FFeb 181°FFeb 181°F80°F80°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.

The figure below shows you a compact characterization of the hourly average winter temperatures. 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 the Winter in Rongelap

Average Hourly Temperature in the Winter in RongelapDecJanFeb12 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 AMFallSpringNowNowwarm
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.

San Andrés, Colombia (7,463 miles away) is the far-away foreign place with temperatures most similar to Rongelap (view comparison).

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Compare Rongelap to another city:

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The winter in Rongelap experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 69% throughout the season. The lowest chance of overcast or mostly cloudy conditions is 67% on February 14.

The clearest day of the winter is February 14, with clear, mostly clear, or partly cloudy conditions 33% of the time.

For reference, on September 28, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 83%, while on February 14, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 33%.

Cloud Cover Categories in the Winter in Rongelap

Cloud Cover Categories in the Winter in RongelapDecJanFeb0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FallSpringSep 2817%Sep 2817%Dec 128%Dec 128%Feb 2831%Feb 2831%Jan 131%Jan 131%Feb 132%Feb 132%NowNowclearmostly clearpartly 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 Rongelap, the chance of a wet day over the course of the winter is very rapidly decreasing, starting the season at 24% and ending it at 7%.

For reference, the year's highest daily chance of a wet day is 52% on September 28, and its lowest chance is 4% on January 30.

Probability of Precipitation in the Winter in Rongelap

Probability of Precipitation in the Winter in RongelapDecJanFeb0%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%FallSpringJan 294%Jan 294%Dec 124%Dec 124%Feb 287%Feb 287%Jan 18%Jan 18%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).

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the winter in Rongelap is rapidly decreasing, starting the season at 2.3 inches, when it rarely exceeds 5.0 inches or falls below 0.2 inches, and ending the season at 0.5 inches, when it rarely exceeds 1.8 inches.

The lowest average 31-day accumulation is 0.3 inches on February 9.

Average Monthly Rainfall in the Winter in Rongelap

Average Monthly Rainfall in the Winter in RongelapDecJanFeb0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 in7 in7 in8 in8 inFallSpringFeb 90.3 inFeb 90.3 inDec 12.3 inDec 12.3 inFeb 280.5 inFeb 280.5 inJan 10.7 inJan 10.7 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.

Over the course of the winter in Rongelap, the length of the day is gradually increasing. From the start to the end of the season, the length of the day increases by 23 minutes, implying an average daily increase of 15 seconds, and weekly increase of 1 minute, 48 seconds.

The shortest day of the winter is December 21, with 11 hours, 28 minutes of daylight and the longest day is February 28, with 11 hours, 54 minutes of daylight.

Hours of Daylight and Twilight in the Winter in Rongelap

Hours of Daylight and Twilight in the Winter in RongelapDecJanFeb0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrFallSpringDec 2111 hr, 28 minDec 2111 hr, 28 minnightnightdaydayFeb 2811 hr, 54 minFeb 2811 hr, 54 minFeb 111 hr, 39 minFeb 111 hr, 39 minNowNow
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 winter in Rongelap is 6:55 AM on December 1 and the latest sunrise is 21 minutes later at 7:16 AM on January 27.

The earliest sunset is 6:27 PM on December 1 and the latest sunset is 35 minutes later at 7:02 PM on February 28.

Daylight saving time is not observed in Rongelap during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 6:30 AM and sets 12 hours, 47 minutes later, at 7:17 PM, while on December 21, the shortest day of the year, it rises at 7:06 AM and sets 11 hours, 28 minutes later, at 6:34 PM.

Sunrise & Sunset with Twilight in the Winter in Rongelap

Sunrise & Sunset with Twilight in the Winter in RongelapDecJanFeb2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMFallSpring6:55 AM6:55 AMDec 16:27 PMDec 16:27 PM7:07 AM7:07 AMFeb 287:02 PMFeb 287:02 PM7:16 AM7:16 AMJan 276:53 PMJan 276:53 PM7:11 AM7:11 AMJan 16:40 PMJan 16:40 PMSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day in the winter. 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 the Winter in Rongelap

Solar Elevation and Azimuth in the Winter in RongelapDecJanFeb12 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 AMFallSpring001020203030405050606000101020303040405060NowNow
northeastsouthwest
Solar elevation and azimuth in the the winter of 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 the winter of 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 the Winter in Rongelap

Moon Rise, Set & Phases in the Winter in RongelapDecJanFeb12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMFallSpringNov 212:48 AMNov 212:48 AMNov 169:29 AMNov 169:29 AMDec 16:22 PMDec 16:22 PMDec 159:02 PMDec 159:02 PMDec 3110:28 AMDec 3110:28 AMJan 1410:28 AMJan 1410:28 AMJan 3012:37 AMJan 3012:37 AMFeb 131:54 AMFeb 131:54 AMFeb 2812:45 PMFeb 2812:45 PMMar 146:55 PMMar 146:55 PMMar 2910:58 PMMar 2910:58 PM6:47 PM6:47 PM5:40 PM5:40 PM6:44 AM6:44 AM6:35 AM6:35 AM6:15 PM6:15 PM6:15 PM6:15 PM7:37 AM7:37 AM6:52 PM6:52 PM6:03 PM6:03 PM7:20 AM7:20 AM6:51 AM6:51 AM6:37 PM6:37 PM6:42 PM6:42 PM7:33 AM7:33 AM7:04 AM7:04 AM7:14 PM7:14 PM7:00 PM7:00 PM7:21 AM7:21 AM
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.

The chance that a given day will be muggy in Rongelap is essentially constant during the winter, remaining around 100% throughout.

Humidity Comfort Levels in the Winter in Rongelap

Humidity Comfort Levels in the Winter in RongelapDecJanFeb0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%FallSpringJan 15100%Jan 15100%Dec 1100%Dec 1100%Feb 28100%Feb 28100%Jan 1100%Jan 1100%Feb 1100%Feb 1100%NowNowmiserablemiserableoppressiveoppressivemuggymuggy
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 Rongelap is essentially constant during the winter, remaining within 0.5 miles per hour of 18.5 miles per hour throughout.

For reference, on December 25, the windiest day of the year, the daily average wind speed is 19.0 miles per hour, while on September 5, the calmest day of the year, the daily average wind speed is 10.9 miles per hour.

The highest daily average wind speed during the winter is 19.0 miles per hour on December 26.

Average Wind Speed in the Winter in Rongelap

Average Wind Speed in the Winter in RongelapDecJanFeb0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mphFallSpringDec 2619.0 mphDec 2619.0 mphDec 118.1 mphDec 118.1 mphFeb 2818.3 mphFeb 2818.3 mphFeb 118.4 mphFeb 118.4 mphNowNow
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 Rongelap throughout the winter is predominantly from the east, with a peak proportion of 98% on February 27.

Wind Direction in the Winter in Rongelap

Wind Direction in the Winter in RongelapDecJanFeb0%100%20%80%40%60%60%40%80%20%100%0%FallSpringNowNoweast
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).

Rongelap 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 Rongelap is gradually decreasing during the winter, falling by 2°F, from 83°F to 81°F, over the course of the season.

The lowest average surface water temperature during the winter is 81°F on February 21.

Average Water Temperature in the Winter in Rongelap

Average Water Temperature in the Winter in RongelapDecJanFeb79°F79°F80°F80°F81°F81°F82°F82°F83°F83°F84°F84°F85°F85°FFallSpringFeb 2181°FFeb 2181°FDec 183°FDec 183°FJan 182°FJan 182°FFeb 181°FFeb 181°FNowNow
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).

Temperatures in Rongelap 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 the Winter in Rongelap

Time Spent in Various Temperature Bands and the Growing Season in the Winter in RongelapDecJanFeb0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FallSpring100%Jan 15100%Jan 15NowNowwarm
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 Rongelap are very rapidly decreasing during the winter, decreasing by 8,807°F, from 10,548°F to 1,741°F, over the course of the season.

Growing Degree Days in the Winter in Rongelap

Growing Degree Days in the Winter in RongelapDecJanFeb2,000°F2,000°F4,000°F4,000°F6,000°F6,000°F8,000°F8,000°F10,000°F10,000°FFallSpringDec 110,548°FDec 110,548°FFeb 281,741°FFeb 281,741°FNowNow
The average growing degree days accumulated over the course of the winter, 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 Rongelap is increasing during the winter, rising by 1.4 kWh, from 5.1 kWh to 6.6 kWh, over the course of the season.

Average Daily Incident Shortwave Solar Energy in the Winter in Rongelap

Average Daily Incident Shortwave Solar Energy in the Winter in RongelapDecJanFeb0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhFallSpringDec 15.1 kWhDec 15.1 kWhFeb 286.6 kWhFeb 286.6 kWhJan 15.5 kWhJan 15.5 kWhFeb 16.1 kWhFeb 16.1 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.

For the purposes of this report, the geographical coordinates of Rongelap are 11.164 deg latitude, 166.894 deg longitude, and 36 ft elevation.

The topography within 2 miles of Rongelap is essentially flat, with a maximum elevation change of 46 feet and an average elevation above sea level of 1 foot. Within 10 miles is also essentially flat (46 feet). Within 50 miles is also essentially flat (82 feet).

The area within 2 miles of Rongelap is covered by water (100%), within 10 miles by water (100%), and within 50 miles by water (100%).

This report illustrates the typical weather in Rongelap, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Rongelap is further than 200 kilometers from the nearest reliable weather station, so the weather-related data on this page were taken entirely from NASA's MERRA-2 satellite-era reanalysis . 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.

The temperature and dew point estimates are corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Rongelap, according to the International Standard Atmosphere .

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.

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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