Climate and Average Weather Year Round in Neietsu South Korea

In Neietsu, the summers are warm, humid, wet, and partly cloudy and the winters are freezing, snowy, and mostly clear. Over the course of the year, the temperature typically varies from 15°F to 83°F and is rarely below 4°F or above 90°F.

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

The warm season lasts for 3.8 months, from May 24 to September 19, with an average daily high temperature above 73°F. The hottest month of the year in Neietsu is August, with an average high of 81°F and low of 67°F.

The cold season lasts for 3.0 months, from December 1 to March 2, with an average daily high temperature below 43°F. The coldest month of the year in Neietsu is January, with an average low of 16°F and high of 33°F.

In Neietsu, 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 Neietsu begins around September 11 and lasts for 6.5 months, ending around March 25.

The clearest month of the year in Neietsu is December, during which on average the sky is clear, mostly clear, or partly cloudy 68% of the time.

The cloudier part of the year begins around March 25 and lasts for 5.5 months, ending around September 11.

The cloudiest month of the year in Neietsu is July, during which on average the sky is overcast or mostly cloudy 56% of the time.

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

The wetter season lasts 3.0 months, from June 15 to September 16, with a greater than 30% chance of a given day being a wet day. The month with the most wet days in Neietsu is July, with an average of 15.4 days with at least 0.04 inches of precipitation.

The drier season lasts 9.0 months, from September 16 to June 15. The month with the fewest wet days in Neietsu is January, with an average of 3.2 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 Neietsu changes throughout the year.

Rain alone is the most common for 12 months, from January 24 to January 15. The month with the most days of rain alone in Neietsu is July, with an average of 15.4 days.

Snow alone is the most common for 1.3 weeks, from January 15 to January 24. The month with the most days of snow alone in Neietsu is January, with an average of 1.2 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. Neietsu experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Neietsu. The month with the most rain in Neietsu is July, with an average rainfall of 9.9 inches.

The month with the least rain in Neietsu is January, with an average rainfall of 0.5 inches.

Snowfall

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

The snowy period of the year lasts for 3.2 months, from December 6 to March 13, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Neietsu is January, with an average snowfall of 2.7 inches.

The snowless period of the year lasts for 8.8 months, from March 13 to December 6. The least snow falls around July 18, with an average total accumulation of 0.0 inches.

The length of the day in Neietsu varies significantly over the course of the year. In 2026, the shortest day is December 22, with 9 hours, 36 minutes of daylight; the longest day is June 21, with 14 hours, 43 minutes of daylight.

The earliest sunrise is at 5:05 AM on June 14, and the latest sunrise is 2 hours, 35 minutes later at 7:40 AM on January 7. The earliest sunset is at 5:08 PM on December 6, and the latest sunset is 2 hours, 42 minutes later at 7:50 PM on June 29.

Daylight saving time (DST) is not observed in Neietsu 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.

Neietsu experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 2.7 months, from June 20 to September 11, during which time the comfort level is muggy, oppressive, or miserable at least 22% of the time. The month with the most muggy days in Neietsu is July, with 22.6 days that are muggy or worse.

The least muggy day of the year is February 18, 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 Neietsu experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.3 months, from November 12 to May 20, with average wind speeds of more than 7.7 miles per hour. The windiest month of the year in Neietsu is January, with an average hourly wind speed of 8.9 miles per hour.

The calmer time of year lasts for 5.7 months, from May 20 to November 12. The calmest month of the year in Neietsu is June, with an average hourly wind speed of 6.6 miles per hour.

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

The wind is most often from the east for 1.5 months, from August 14 to September 30, with a peak percentage of 41% on September 8. The wind is most often from the west for 10 months, from September 30 to August 14, with a peak percentage of 73% on January 1.

Neietsu 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 11 to September 29, with an average temperature above 70°F. The month of the year in Neietsu with the warmest water is August, with an average temperature of 75°F.

The time of year with cooler water lasts for 3.8 months, from December 28 to April 21, with an average temperature below 54°F. The month of the year in Neietsu with the coolest water is February, with an average temperature of 49°F.

To characterize how pleasant the weather is in Neietsu 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 Neietsu for general outdoor tourist activities is from late May to mid September, with a peak score in the third week of June.

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 Neietsu for hot-weather activities is from mid July to mid August, with a peak score in the first 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 Neietsu typically lasts for 6.5 months (200 days), from around April 8 to around October 25, rarely starting before March 24 or after April 23, and rarely ending before October 10 or after November 10.

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 Neietsu should appear around April 18, only rarely appearing before April 9 or after April 26.

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 3.6 months, from April 19 to August 6, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest month of the year in Neietsu is June, with an average of 6.3 kWh.

The darker period of the year lasts for 3.0 months, from November 4 to February 4, with an average daily incident shortwave energy per square meter below 3.3 kWh. The darkest month of the year in Neietsu is December, with an average of 2.5 kWh.

For the purposes of this report, the geographical coordinates of Neietsu are 37.184 deg latitude, 128.468 deg longitude, and 682 ft elevation.

The topography within 2 miles of Neietsu contains large variations in elevation, with a maximum elevation change of 1,985 feet and an average elevation above sea level of 969 feet. Within 10 miles also contains large variations in elevation (3,064 feet). Within 50 miles contains large variations in elevation (5,180 feet).

The area within 2 miles of Neietsu is covered by trees (44%), sparse vegetation (27%), grassland (18%), and cropland (11%), within 10 miles by trees (72%) and grassland (14%), and within 50 miles by trees (64%) and grassland (11%).