Thinking of going back over christmas vacation. For each station, the records are corrected for the elevation difference between that station and Saint Petersburg according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. All 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. St Petersburg 7 day weather forecast including weather warnings, temperature, rain, wind, visibility, humidity and UV For reference, on January 24, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on July 17, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 57%. For reference, on June 20, the longest day of the year, the Sun rises at 6:35 AM and sets 13 hours, 54 minutes later, at 8:29 PM, while on December 21, the shortest day of the year, it rises at 7:17 AM and sets 10 hours, 23 minutes later, at 5:40 PM. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The thin dotted line is the corresponding average liquid-equivalent snowfall. The percentage of time spent in various temperature bands. This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The chance that a given day will be muggy in St. Petersburg is rapidly decreasing during December, falling from 34% to 23% over the course of the month. Daily low temperatures decrease by 5°F , from 62°F to 57°F , rarely falling below 46°F or exceeding 71°F . The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The solar day over the course of December. The shaded overlays indicate night and civil twilight. From the start to the end of the month, the length of the day decreases by 25 minutes, implying an average daily decrease of 51 seconds, and weekly decrease of 5 minutes, 54 seconds. 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 topography within 3 kilometres of Saint Petersburg is essentially flat, with a maximum elevation change of 28 metres and an average elevation above sea level of 12 metres. The average sliding 31-day rainfall during December in St. Petersburg is gradually increasing, starting the month at 1.8 inches, when it rarely exceeds 4.4 inches or falls below 0.3 inches, and ending the month at 2.2 inches, when it rarely exceeds 4.1 inches or falls below 0.5 inches. Over the course of December in Saint Petersburg, the length of the day is gradually decreasing. This report illustrates the typical weather in St. Petersburg, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Weather data is prone to errors, outages, and other defects. MERRA-2 Modern-Era Retrospective Analysis. The chance that a given day will be muggy in Saint Petersburg is essentially constant during December, remaining around 0% throughout. about 0*C; short day light time period (gets light about 11 am and gets dark around 4 pm). Daily low temperatures decrease by 5°F, from 23°F to 18°F, rarely falling below -2°F or exceeding 36°F. 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. The earliest sunset is 5:35 PM on December 1 and the latest sunset is 11 minutes later at 5:46 PM on December 31. The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. We report snowfall in liquid-equivalent terms. Weather Forecast St Petersburg: Weather forecast in December Want to organise your holiday inSt Petersburg Take a look at the weather forecast without delay! Air temp will depend on the cold fronts that come through. The number of hours during which the Sun is visible (black line). Low Temperature -7 °C 19 °F. Thinking of going back over christmas vacation. The warmest sea in St Petersburg in December is 22.9°C/73.2°F, and the coldest sea temperature in December … Weather in St Petersburg in December: air temperature, number of sunny days, precipitation, air pressure and humidity. Average Weather in December in St. Petersburg Florida, United States Daily high temperatures decrease by 4°F , from 74°F to 70°F , rarely falling below 60°F or exceeding 81°F . 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 (≥ 0 °C) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere). The topography within 2 miles of St. Petersburg is essentially flat, with a maximum elevation change of 49 feet and an average elevation above sea level of 39 feet. 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