1. WeatherSpark.com
  2. Japan
  3. Hokkaido
  4. Muroran

Average Weather in Muroran Japan

In Muroran, the summers are comfortable, humid, and wet; the winters are freezing and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 25°F to 75°F and is rarely below 19°F or above 82°F.

Based on the tourism score, the best time of year to visit Muroran for warm-weather activities is from mid July to mid September.

Climate Summary

very coldcoldcoolcomfortablecoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDec66%66%35%35%overcastprecipitation: 5.7 inprecipitation: 5.7 in1.2 in1.2 inmuggy: 60%muggy: 60%0%0%drydrytourism score: 6.7tourism score: 6.70.00.0
Click on each chart for more information.

Temperature

The warm season lasts for 3.1 months, from June 26 to September 30, with an average daily high temperature above 66°F. The hottest day of the year is August 14, with an average high of 75°F and low of 66°F.

The cold season lasts for 3.5 months, from December 6 to March 20, with an average daily high temperature below 40°F. The coldest day of the year is January 28, with an average low of 25°F and high of 32°F.

Average High and Low Temperature

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 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

Average Hourly Temperature in MuroranJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfreezingvery coldvery coldcoldcoldcoolcoolcomfortablefreezing
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.

Hamlin, New York, United States (6,055 miles away); Nantucket, Massachusetts, United States (6,351 miles); and Halifax, Canada (6,247 miles) are the far-away foreign places with temperatures most similar to Muroran (view comparison).

Clouds

In Muroran, 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 Muroran begins around September 12 and lasts for 2.9 months, ending around December 9. On October 24, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 66% of the time, and overcast or mostly cloudy 34% of the time.

The cloudier part of the year begins around December 9 and lasts for 9.1 months, ending around September 12. On February 1, the cloudiest day of the year, the sky is overcast or mostly cloudy 65% of the time, and clear, mostly clear, or partly cloudy 35% of the time.

Cloud Cover Categories

Cloud Cover Categories in MuroranclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 2466%Oct 2466%Feb 135%Feb 135%Sep 1250%Sep 1250%Dec 951%Dec 951%clearmostly clearpartly cloudymostly 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.

Precipitation

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

The wetter season lasts 5.5 months, from July 10 to December 26, with a greater than 30% chance of a given day being a wet day. The chance of a wet day peaks at 40% on November 6.

The drier season lasts 6.5 months, from December 26 to July 10. The smallest chance of a wet day is 20% on March 27.

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 in Muroran changes throughout the year.

Rain alone is the most common for 11 months, from February 23 to January 12. The highest chance of a day with rain alone is 39% on November 3.

Snow alone is the most common for 1.4 months, from January 12 to February 23. The highest chance of a day with snow alone is 11% on January 18.

Daily Chance of Precipitation

Daily Chance of Precipitation in MuroransnowrainJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Nov 640%Nov 640%Mar 2720%Mar 2720%Jan 1225%Jan 1225%Jan 128%Jan 128%Jul 1030%Jul 1030%snowrainmixed
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 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. Muroran experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Muroran. The most rain falls during the 31 days centered around August 28, with an average total accumulation of 5.7 inches.

The least rain falls around February 3, with an average total accumulation of 0.7 inches.

Average Monthly Rainfall

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 liquid-equivalent snowfall.

Snowfall

We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Muroran experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 4.4 months, from November 18 to March 31, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 30, with an average total liquid-equivalent accumulation of 0.5 inches.

The snowless period of the year lasts for 7.6 months, from March 31 to November 18. The least snow falls around August 1, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall in MuroransnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in1 in2 in3 in4 in5 in6 inJan 300.5 inJan 300.5 inAug 10.0 inAug 10.0 inNov 180.1 inNov 180.1 inMar 310.1 inMar 310.1 in
The average liquid-equivalent snowfall (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 rainfall.

Sun

The length of the day in Muroran varies significantly over the course of the year. In 2018, the shortest day is December 22, with 9 hours, 5 minutes of daylight; the longest day is June 21, with 15 hours, 17 minutes of daylight.

Hours of Daylight and Twilight

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 is at 3:58 AM on June 15, and the latest sunrise is 3 hours, 6 minutes later at 7:05 AM on January 5. The earliest sunset is at 4:03 PM on December 9, and the latest sunset is 3 hours, 13 minutes later at 7:16 PM on June 28.

Daylight saving time (DST) is not observed in Muroran during 2018.

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight in MuroranJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PMJun 153:58 AMJun 153:58 AM7:16 PMJun 287:16 PMJun 28Dec 94:03 PMDec 94:03 PM7:05 AMJan 57:05 AMJan 5daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2018. 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.

Humidity

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.

Muroran experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 2.2 months, from July 10 to September 17, during which time the comfort level is muggy, oppressive, or miserable at least 15% of the time. The muggiest day of the year is August 10, with muggy conditions 60% of the time.

The least muggy day of the year is December 3, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in MuroranmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Dec 30%Dec 30%Aug 1060%Aug 1060%Jul 1015%Jul 1015%Sep 1715%Sep 1715%drydryoppressiveoppressivehumidhumidcomfortablecomfortable
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.

Wind

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 Muroran experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.9 months, from October 13 to April 9, with average wind speeds of more than 9.8 miles per hour. The windiest day of the year is January 19, with an average hourly wind speed of 13.4 miles per hour.

The calmer time of year lasts for 6.1 months, from April 9 to October 13. The calmest day of the year is July 26, with an average hourly wind speed of 6.3 miles per hour.

Average Wind Speed

Average Wind Speed in MuroranwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mph20 mphJan 1913.4 mphJan 1913.4 mphJul 266.3 mphJul 266.3 mphOct 139.8 mphOct 139.8 mphApr 99.8 mphApr 99.8 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Muroran varies throughout the year.

The wind is most often from the east for 3.6 months, from May 23 to September 11, with a peak percentage of 43% on June 24. The wind is most often from the west for 8.4 months, from September 11 to May 23, with a peak percentage of 69% on January 1.

Wind Direction

Wind Direction in MuroranWEWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westeastnorthsouth
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).

Water Temperature

Muroran 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 significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.8 months, from July 17 to October 9, with an average temperature above 63°F. The day of the year with the warmest water is August 24, with an average temperature of 70°F.

The time of year with cooler water lasts for 4.0 months, from January 6 to May 6, with an average temperature below 45°F. The day of the year with the coolest water is February 28, with an average temperature of 39°F.

Average Water Temperature

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in Muroran 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 Muroran for general outdoor tourist activities is from mid July to mid September, with a peak score in the second week of August.

Tourism Score

Tourism Score in Muroranbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.76.70.00.0precipitationprecipitationcloudscloudstemperaturetemperaturetourism 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 time of year to visit Muroran for hot-weather activities is for the entire month of August, with a peak score in the third week of August.

Beach/Pool Score

Beach/Pool Score in MuroranJanFebMarAprMayJunJulAugSepOctNovDec02468103.73.70.00.0 precipitationprecipitationcloudscloudstemperaturetemperature
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.

Growing Season

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 Muroran typically lasts for 7.5 months (229 days), from around April 4 to around November 19, rarely starting before March 19 or after April 20, and rarely ending before November 3 or after December 6.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Murorangrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 450%Apr 450%Nov 1950%Nov 1990%Apr 2090%Apr 2090%Nov 390%Nov 310%Mar 1910%Mar 1910%Dec 610%Dec 6Jul 30100%Jul 30100%freezingvery coldcoldcoolcomfortablewarm
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.

Based on growing degree days alone, the first spring blooms in Muroran should appear around May 26, only rarely appearing before May 16 or after June 6.

Growing Degree Days

The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 4.0 months, from April 22 to August 21, with an average daily incident shortwave energy per square meter above 5.1 kWh. The brightest day of the year is June 11, with an average of 6.0 kWh.

The darker period of the year lasts for 3.2 months, from November 9 to February 14, with an average daily incident shortwave energy per square meter below 2.2 kWh. The darkest day of the year is December 29, with an average of 1.3 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in MuroranbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJun 116.0 kWhJun 116.0 kWhDec 291.3 kWhDec 291.3 kWhApr 225.1 kWhApr 225.1 kWhAug 215.1 kWhAug 215.1 kWhFeb 142.2 kWhFeb 142.2 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Muroran are 42.317 deg latitude, 140.988 deg longitude, and 0 ft elevation.

The topography within 2 miles of Muroran contains significant variations in elevation, with a maximum elevation change of 604 feet and an average elevation above sea level of 70 feet. Within 10 miles contains significant variations in elevation (2,966 feet). Within 50 miles contains large variations in elevation (6,270 feet).

The area within 2 miles of Muroran is covered by water (55%), cropland (23%), and trees (14%), within 10 miles by water (82%) and trees (11%), and within 50 miles by water (58%) and trees (32%).

Data Sources

This report illustrates the typical weather in Muroran, 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 are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Muroran.

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

The estimated value at Muroran is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Muroran and a given station.

The stations contributing to this reconstruction are: Muroran (98%, 0.4 kilometers, west) and Chitose Air Base (1.6%, 77 kilometers, northeast).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

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.