Climate and Average Weather Year Round in Kaminoyama Japan

In Kaminoyama, the summers are wet, muggy, mostly cloudy, and warm and the winters are freezing, snowy, and partly cloudy. Over the course of the year, the temperature typically varies from 23°F to 83°F and is rarely below 16°F or above 89°F.

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

The warm season lasts for 3.0 months, from June 20 to September 20, with an average daily high temperature above 73°F. The hottest month of the year in Kaminoyama is August, with an average high of 82°F and low of 68°F.

The cold season lasts for 3.4 months, from December 5 to March 17, with an average daily high temperature below 44°F. The coldest month of the year in Kaminoyama is January, with an average low of 24°F and high of 35°F.

In Kaminoyama, 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 Kaminoyama begins around September 28 and lasts for 6.4 months, ending around April 8.

The clearest month of the year in Kaminoyama is November, during which on average the sky is clear, mostly clear, or partly cloudy 58% of the time.

The cloudier part of the year begins around April 8 and lasts for 5.6 months, ending around September 28.

The cloudiest month of the year in Kaminoyama is July, during which on average the sky is overcast or mostly cloudy 63% of the time.

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

The wetter season lasts 5.8 months, from June 19 to December 13, with a greater than 39% chance of a given day being a wet day. The month with the most wet days in Kaminoyama is July, with an average of 14.4 days with at least 0.04 inches of precipitation.

The drier season lasts 6.2 months, from December 13 to June 19. The month with the fewest wet days in Kaminoyama is February, with an average of 7.8 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. Based on this categorization, the most common form of precipitation in Kaminoyama changes throughout the year.

Rain alone is the most common for 11 months, from February 12 to January 12. The month with the most days of rain alone in Kaminoyama is July, with an average of 14.4 days.

Snow alone is the most common for 1.0 months, from January 12 to February 12. The month with the most days of snow alone in Kaminoyama is January, with an average of 3.5 days.

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. Kaminoyama experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Kaminoyama. The month with the most rain in Kaminoyama is July, with an average rainfall of 5.9 inches.

The month with the least rain in Kaminoyama is January, with an average rainfall of 1.1 inches.

Snowfall

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

The snowy period of the year lasts for 4.6 months, from November 16 to April 2, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Kaminoyama is January, with an average snowfall of 10.1 inches.

The snowless period of the year lasts for 7.4 months, from April 2 to November 16. The least snow falls around July 29, with an average total accumulation of 0.0 inches.

The length of the day in Kaminoyama varies significantly over the course of the year. In 2026, the shortest day is December 22, with 9 hours, 31 minutes of daylight; the longest day is June 21, with 14 hours, 49 minutes of daylight.

The earliest sunrise is at 4:15 AM on June 13, and the latest sunrise is 2 hours, 40 minutes later at 6:55 AM on January 6. The earliest sunset is at 4:18 PM on December 7, and the latest sunset is 2 hours, 47 minutes later at 7:06 PM on June 28.

Daylight saving time (DST) is not observed in Kaminoyama during 2026.

The figure below presents a compact representation of key lunar data for 2026. 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.

Kaminoyama experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 2.8 months, from June 24 to September 19, during which time the comfort level is muggy, oppressive, or miserable at least 20% of the time. The month with the most muggy days in Kaminoyama is August, with 22.4 days that are muggy or worse.

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

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

The windier part of the year lasts for 5.3 months, from November 21 to April 29, with average wind speeds of more than 7.1 miles per hour. The windiest month of the year in Kaminoyama is February, with an average hourly wind speed of 9.6 miles per hour.

The calmer time of year lasts for 6.7 months, from April 29 to November 21. The calmest month of the year in Kaminoyama is July, with an average hourly wind speed of 4.6 miles per hour.

The predominant average hourly wind direction in Kaminoyama is from the west throughout the year.

Kaminoyama 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 2.6 months, from July 16 to October 4, with an average temperature above 71°F. The month of the year in Kaminoyama with the warmest water is August, with an average temperature of 76°F.

The time of year with cooler water lasts for 3.8 months, from January 8 to May 2, with an average temperature below 54°F. The month of the year in Kaminoyama with the coolest water is March, with an average temperature of 48°F.

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

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 Kaminoyama typically lasts for 6.8 months (207 days), from around April 12 to around November 5, rarely starting before March 28 or after April 28, and rarely ending before October 20 or after November 22.

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 Kaminoyama should appear around April 29, only rarely appearing before April 22 or after May 7.

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 4.2 months, from April 17 to August 24, with an average daily incident shortwave energy per square meter above 5.2 kWh. The brightest month of the year in Kaminoyama is June, with an average of 5.9 kWh.

The darker period of the year lasts for 3.1 months, from November 9 to February 12, with an average daily incident shortwave energy per square meter below 2.6 kWh. The darkest month of the year in Kaminoyama is December, with an average of 1.7 kWh.

For the purposes of this report, the geographical coordinates of Kaminoyama are 38.154 deg latitude, 140.274 deg longitude, and 581 ft elevation.

The topography within 2 miles of Kaminoyama contains very significant variations in elevation, with a maximum elevation change of 1,427 feet and an average elevation above sea level of 863 feet. Within 10 miles contains very significant variations in elevation (5,732 feet). Within 50 miles also contains extreme variations in elevation (7,054 feet).

The area within 2 miles of Kaminoyama is covered by trees (50%) and cropland (48%), within 10 miles by trees (72%) and cropland (22%), and within 50 miles by trees (66%) and cropland (18%).