Winter Weather at Phetchaburi ThailandDaily high temperatures are around 88°F, rarely falling below 82°F or exceeding 92°F. The lowest daily average high temperature is 87°F on December 15. Daily low temperatures increase by 4°F, from 72°F to 76°F, rarely falling below 63°F or exceeding 80°F. The lowest daily average low temperature is 69°F on January 1. For reference, on April 21, the hottest day of the year, temperatures at Phetchaburi typically range from 80°F to 93°F, while on January 1, the coldest day of the year, they range from 69°F to 87°F. The figure below shows you a compact characterization of the hourly average winter temperatures. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day. Juchitán de Zaragoza, Mexico (10,159 miles away) is the far-away foreign place with temperatures most similar to Phetchaburi (view comparison). CloudsThe winter at Phetchaburi experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 58% to 48%. The lowest chance of overcast or mostly cloudy conditions is 43% on February 10. The clearest day of the winter is February 10, with clear, mostly clear, or partly cloudy conditions 57% of the time. For reference, on May 27, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 94%, while on February 10, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 57%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Phetchaburi, the chance of a wet day over the course of the winter is essentially constant, remaining around 5% throughout. For reference, the year's highest daily chance of a wet day is 64% on September 28, and its lowest chance is 1% on December 23. RainfallTo show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day rainfall during the winter at Phetchaburi is essentially constant, remaining about 0.5 inches throughout, and rarely exceeding 2.4 inches or falling below -0.0 inches. The lowest average 31-day accumulation is 0.1 inches on December 28. SunOver the course of the winter at Phetchaburi, the length of the day is gradually increasing. From the start to the end of the season, the length of the day increases by 28 minutes, implying an average daily increase of 19 seconds, and weekly increase of 2 minutes, 10 seconds. The shortest day of the winter is December 22, with 11 hours, 21 minutes of daylight and the longest day is February 28, with 11 hours, 52 minutes of daylight. The earliest sunrise of the winter at Phetchaburi is 6:26 AM on December 1 and the latest sunrise is 20 minutes later at 6:46 AM on January 24. The earliest sunset is 5:51 PM on December 1 and the latest sunset is 37 minutes later at 6:28 PM on February 28. Daylight saving time is not observed at Phetchaburi during 2024. For reference, on June 20, the longest day of the year, the Sun rises at 5:54 AM and sets 12 hours, 54 minutes later, at 6:48 PM, while on December 21, the shortest day of the year, it rises at 6:37 AM and sets 11 hours, 21 minutes later, at 5:58 PM. The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation. MoonThe figure below presents a compact representation of key lunar data for the winter of 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon. HumidityWe 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. The chance that a given day will be muggy at Phetchaburi is rapidly increasing during the winter, rising from 80% to 95% over the course of the season. The lowest chance of a muggy day during the winter is 63% on December 29. For reference, on May 2, the muggiest day of the year, there are muggy conditions 100% of the time, while on December 29, the least muggy day of the year, there are muggy conditions 63% of the time. WindThis 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 at Phetchaburi is essentially constant during the winter, remaining within 0.7 miles per hour of 7.5 miles per hour throughout. For reference, on August 5, the windiest day of the year, the daily average wind speed is 8.5 miles per hour, while on October 4, the calmest day of the year, the daily average wind speed is 5.6 miles per hour. The lowest daily average wind speed during the winter is 6.8 miles per hour on January 16. The wind direction at Phetchaburi during the winter is predominantly out of the north from December 1 to January 8 and the south from January 8 to February 28. Water TemperaturePhetchaburi 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 surface water temperature at Phetchaburi is essentially constant during the winter, remaining within 1°F of 82°F throughout. The lowest average surface water temperature during the winter is 81°F on January 6. Growing SeasonDefinitions 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). Temperatures at Phetchaburi are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year. 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. The average accumulated growing degree days at Phetchaburi are very rapidly decreasing during the winter, decreasing by 8,990°F, from 10,706°F to 1,716°F, over the course of the season. Solar EnergyThis 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 at Phetchaburi is increasing during the winter, rising by 1.0 kWh, from 5.1 kWh to 6.2 kWh, over the course of the season. TopographyFor the purposes of this report, the geographical coordinates of Phetchaburi are 13.150 deg latitude, 100.067 deg longitude, and 3 ft elevation. The topography within 2 miles of Phetchaburi is essentially flat, with a maximum elevation change of 39 feet and an average elevation above sea level of 4 feet. Within 10 miles is essentially flat (341 feet). Within 50 miles contains only modest variations in elevation (4,019 feet). The area within 2 miles of Phetchaburi is covered by water (49%), artificial surfaces (23%), and cropland (16%), within 10 miles by water (61%) and cropland (29%), and within 50 miles by water (43%) and cropland (37%). Data SourcesThis report illustrates the typical weather at Phetchaburi, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Temperature and Dew PointPhetchaburi has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required. In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations. The stations on which we may fall back are Hua Hin Airport, U-Tapao International Airport, Suvarnabhumi Airport, Don Mueang International Airport, and Prachuap Khirikhan. Other DataAll data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com . Maps are © OpenStreetMap contributors. DisclaimerThe 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. 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