Climate and Average Weather Year Round in Thérmi Greece

In Thérmi, the summers are hot, dry, and mostly clear and the winters are very cold and partly cloudy. Over the course of the year, the temperature typically varies from 34°F to 89°F and is rarely below 25°F or above 95°F.

Based on the beach/pool score, the best time of year to visit Thérmi for hot-weather activities is from late June to late August.

The hot season lasts for 3.3 months, from June 3 to September 12, with an average daily high temperature above 81°F. The hottest month of the year in Thérmi is July, with an average high of 88°F and low of 68°F.

The cool season lasts for 3.7 months, from November 22 to March 13, with an average daily high temperature below 56°F. The coldest month of the year in Thérmi is January, with an average low of 35°F and high of 48°F.

In Thérmi, 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 Thérmi begins around June 4 and lasts for 3.6 months, ending around September 22.

The clearest month of the year in Thérmi is July, during which on average the sky is clear, mostly clear, or partly cloudy 92% of the time.

The cloudier part of the year begins around September 22 and lasts for 8.4 months, ending around June 4.

The cloudiest month of the year in Thérmi is February, during which on average the sky is overcast or mostly cloudy 48% 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 Thérmi varies throughout the year.

The wetter season lasts 8.0 months, from October 7 to June 6, with a greater than 16% chance of a given day being a wet day. The month with the most wet days in Thérmi is December, with an average of 6.3 days with at least 0.04 inches of precipitation.

The drier season lasts 4.0 months, from June 6 to October 7. The month with the fewest wet days in Thérmi is August, with an average of 3.0 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 Thérmi is November, with an average of 6.0 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 23% on November 28.

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. Thérmi experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Thérmi. The month with the most rain in Thérmi is November, with an average rainfall of 1.9 inches.

The month with the least rain in Thérmi is August, with an average rainfall of 0.6 inches.

The length of the day in Thérmi varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 16 minutes of daylight; the longest day is June 20, with 15 hours, 5 minutes of daylight.

The earliest sunrise is at 5:56 AM on June 14, and the latest sunrise is 1 hour, 55 minutes later at 7:51 AM on January 4. The earliest sunset is at 5:00 PM on December 7, and the latest sunset is 4 hours, 2 minutes later at 9:02 PM on June 27.

Daylight saving time (DST) is observed in Thérmi during 2024, starting in the spring on March 31, lasting 6.9 months, and ending in the fall on October 27.

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.

Thérmi experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.1 months, from June 10 to September 14, during which time the comfort level is muggy, oppressive, or miserable at least 5% of the time. The month with the most muggy days in Thérmi is August, with 5.1 days that are muggy or worse.

The least muggy day of the year is February 28, 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 Thérmi experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.7 months, from November 3 to April 24, with average wind speeds of more than 6.4 miles per hour. The windiest month of the year in Thérmi is February, with an average hourly wind speed of 7.3 miles per hour.

The calmer time of year lasts for 6.3 months, from April 24 to November 3. The calmest month of the year in Thérmi is August, with an average hourly wind speed of 5.5 miles per hour.

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

The wind is most often from the east for 3.0 months, from February 10 to May 11 and for 2.1 months, from September 23 to November 25, with a peak percentage of 41% on October 29. The wind is most often from the south for 1.5 months, from May 11 to June 27 and for 2.5 months, from July 8 to September 23, with a peak percentage of 36% on September 1. The wind is most often from the north for 1.6 weeks, from June 27 to July 8 and for 2.5 months, from November 25 to February 10, with a peak percentage of 34% on July 1.

Thérmi 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 3.0 months, from June 21 to September 22, with an average temperature above 74°F. The month of the year in Thérmi with the warmest water is August, with an average temperature of 79°F.

The time of year with cooler water lasts for 4.4 months, from December 10 to April 22, with an average temperature below 59°F. The month of the year in Thérmi with the coolest water is February, with an average temperature of 55°F.

To characterize how pleasant the weather is in Thérmi 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 Thérmi for general outdoor tourist activities are from mid May to early July and from mid August to early October, with a peak score in the second 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 Thérmi for hot-weather activities is from late June to late August, with a peak score in the last week of July.

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 Thérmi typically lasts for 8.8 months (268 days), from around March 8 to around December 1, rarely starting before February 11 or after March 31, and rarely ending before November 5 or after December 24.

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 Thérmi should appear around March 21, only rarely appearing before March 4 or after April 8.

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 extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.2 months, from May 14 to August 20, with an average daily incident shortwave energy per square meter above 6.6 kWh. The brightest month of the year in Thérmi is July, with an average of 7.6 kWh.

The darker period of the year lasts for 3.6 months, from October 29 to February 17, with an average daily incident shortwave energy per square meter below 3.0 kWh. The darkest month of the year in Thérmi is December, with an average of 1.9 kWh.

For the purposes of this report, the geographical coordinates of Thérmi are 40.547 deg latitude, 23.020 deg longitude, and 177 ft elevation.

The topography within 2 miles of Thérmi contains significant variations in elevation, with a maximum elevation change of 768 feet and an average elevation above sea level of 222 feet. Within 10 miles contains significant variations in elevation (3,927 feet). Within 50 miles also contains extreme variations in elevation (9,610 feet).

The area within 2 miles of Thérmi is covered by cropland (36%), trees (17%), sparse vegetation (17%), and grassland (16%), within 10 miles by cropland (24%) and water (19%), and within 50 miles by water (33%) and cropland (29%).