Climate and Average Weather Year Round in Haenam South Korea

In Haenam, the summers are warm, oppressive, wet, and mostly cloudy and the winters are very cold, windy, and partly cloudy. Over the course of the year, the temperature typically varies from 30°F to 85°F and is rarely below 23°F or above 90°F.

Based on the tourism score, the best times of year to visit Haenam for warm-weather activities are from late May to mid June and from late August to early October.

The hot season lasts for 3.1 months, from June 17 to September 20, with an average daily high temperature above 77°F. The hottest month of the year in Haenam is August, with an average high of 84°F and low of 74°F.

The cold season lasts for 3.2 months, from December 1 to March 8, with an average daily high temperature below 51°F. The coldest month of the year in Haenam is January, with an average low of 30°F and high of 42°F.

In Haenam, 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 Haenam begins around September 7 and lasts for 6.4 months, ending around March 18.

The clearest month of the year in Haenam is November, during which on average the sky is clear, mostly clear, or partly cloudy 70% of the time.

The cloudier part of the year begins around March 18 and lasts for 5.6 months, ending around September 7.

The cloudiest month of the year in Haenam is July, during which on average the sky is overcast or mostly cloudy 60% 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 Haenam varies significantly throughout the year.

The wetter season lasts 3.0 months, from June 10 to September 10, with a greater than 29% chance of a given day being a wet day. The month with the most wet days in Haenam is July, with an average of 13.6 days with at least 0.04 inches of precipitation.

The drier season lasts 9.0 months, from September 10 to June 10. The month with the fewest wet days in Haenam is January, with an average of 3.3 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. The month with the most days of rain alone in Haenam is July, with an average of 13.6 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 50% on July 1.

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. Haenam experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Haenam. The month with the most rain in Haenam is July, with an average rainfall of 9.6 inches.

The month with the least rain in Haenam is January, with an average rainfall of 0.9 inches.

The length of the day in Haenam varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 50 minutes of daylight; the longest day is June 21, with 14 hours, 28 minutes of daylight.

The earliest sunrise is at 5:20 AM on June 12, and the latest sunrise is 2 hours, 21 minutes later at 7:41 AM on January 8. The earliest sunset is at 5:22 PM on December 5, and the latest sunset is 2 hours, 28 minutes later at 7:50 PM on June 29.

Daylight saving time (DST) is not observed in Haenam during 2024.

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

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.

Haenam experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.6 months, from June 8 to September 26, during which time the comfort level is muggy, oppressive, or miserable at least 25% of the time. The month with the most muggy days in Haenam is August, with 29.2 days that are muggy or worse.

The least muggy day of the year is February 13, 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 Haenam experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.2 months, from November 1 to April 7, with average wind speeds of more than 10.7 miles per hour. The windiest month of the year in Haenam is January, with an average hourly wind speed of 13.5 miles per hour.

The calmer time of year lasts for 6.8 months, from April 7 to November 1. The calmest month of the year in Haenam is June, with an average hourly wind speed of 8.0 miles per hour.

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

The wind is most often from the east for 4.3 weeks, from May 21 to June 20 and for 3.7 weeks, from August 13 to September 8, with a peak percentage of 37% on September 7. The wind is most often from the south for 1.8 months, from June 20 to August 13, with a peak percentage of 49% on July 21. The wind is most often from the north for 7.7 months, from September 8 to April 28, with a peak percentage of 68% on January 1.

Haenam 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 2.5 months, from July 12 to September 27, with an average temperature above 72°F. The month of the year in Haenam with the warmest water is August, with an average temperature of 77°F.

The time of year with cooler water lasts for 4.4 months, from December 17 to April 30, with an average temperature below 56°F. The month of the year in Haenam with the coolest water is March, with an average temperature of 51°F.

To characterize how pleasant the weather is in Haenam 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 times of year to visit Haenam for general outdoor tourist activities are from late May to mid June and from late August to early October, with a peak score in the third week of September.

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 Haenam for hot-weather activities is from mid July to late 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 Haenam typically lasts for 8.6 months (262 days), from around March 13 to around November 30, rarely starting before February 25 or after March 31, and rarely ending before November 14 or after December 17.

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 Haenam should appear around April 8, only rarely appearing before March 29 or after April 17.

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 2.5 months, from April 12 to June 28, with an average daily incident shortwave energy per square meter above 5.6 kWh. The brightest month of the year in Haenam is May, with an average of 6.3 kWh.

The darker period of the year lasts for 2.9 months, from November 10 to February 5, with an average daily incident shortwave energy per square meter below 3.3 kWh. The darkest month of the year in Haenam is December, with an average of 2.6 kWh.

For the purposes of this report, the geographical coordinates of Haenam are 34.571 deg latitude, 126.599 deg longitude, and 128 ft elevation.

The topography within 2 miles of Haenam contains very significant variations in elevation, with a maximum elevation change of 1,493 feet and an average elevation above sea level of 378 feet. Within 10 miles contains very significant variations in elevation (2,192 feet). Within 50 miles contains large variations in elevation (3,891 feet).

The area within 2 miles of Haenam is covered by cropland (47%) and trees (41%), within 10 miles by cropland (40%) and trees (27%), and within 50 miles by water (60%) and trees (15%).