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. 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. MERRA-2 Modern-Era Retrospective Analysis. The chance of wet days in Petersburg varies significantly throughout the year. The windiest day of the year is January 2, with an average hourly wind speed of 9.2 miles per hour. On May 26, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 33% of the time, and overcast or mostly cloudy 67% of the time. The day of the year with the warmest water is August 14, with an average temperature of 53Â°F. In this report, we use a base of 50Â°F and a cap of 86Â°F. The average hourly temperature, color coded into bands. This report illustrates the typical weather in Petersburg, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. Our beach/pool temperature score is 0 for perceived temperatures below 65Â°F, rising linearly to 9 for 75Â°F, to 10 for 82Â°F, falling linearly to 9 for 90Â°F, and to 1 for 100Â°F or hotter. The highest chance of a day with rain alone is 38% on September 22. The most snow falls during the 31 days centered around December 11, with an average total liquid-equivalent accumulation of 1.0 inches. 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 . We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. The solar day over the course of the year 2020. As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. To characterize how pleasant the weather is in Anchorage throughout the year, we compute two travel scores. The most snow falls during the 31 days centered around January 15, with an average total liquid-equivalent accumulation of 1.5 inches. From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night. January has the lowest average temperature of the year. In 2020, the shortest day is December 21, with 6 hours, 45 minutes of daylight; the longest day is June 20, with 17 hours, 50 minutes of daylight. 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. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. In Anchorage, the summers are cool and mostly cloudy and the winters are long, freezing, snowy, and partly cloudy. support@__remove_this_part__weatherspark.com. The brightest day of the year is May 26, with an average of 5.1 kWh. The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. 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. Here are the average temperatures. A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The snowless period of the year lasts for 6.5 months, from April 4 to October 20. For each station, the records are corrected for the elevation difference between that station and Anchorage according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. Snow alone is the most common for 4.4 months, from November 5 to March 19. The windier part of the year lasts for 7.1 months, from September 13 to April 16, with average wind speeds of more than 5.4 miles per hour. Average Weather in Petersburg Alaska, United States. The chance of a wet day peaks at 39% on September 26. The shaded overlays indicate night and civil twilight. The tourism score favors clear, rainless days with perceived temperatures between 65Â°F and 80Â°F. The windier part of the year lasts for 6.5 months, from October 1 to April 18, with average wind speeds of more than 6.7 miles per hour. Warr Acres Based on this categorization, the most common form of precipitation in Anchorage changes throughout the year. The earliest sunrise is at 3:58 AM on June 17, and the latest sunrise is 4 hours, 31 minutes later at 8:29 AM on December 28. Temperatures have changed more in Alaska over the past 30 years than they have anywhere else on Earth: winters have warmed by a startling 5-6°F, compared with a global average of 1°F. The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures. The number of hours during which the Sun is visible (black line). Oklahoma City The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. This report illustrates the typical weather in Anchorage, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Shortwave radiation includes visible light and ultraviolet radiation. Based on the tourism score, the best time of year to visit Petersburg for warm-weather activities is from early July to mid August. The earliest sunset is at 3:40 PM on December 15, and the latest sunset is 8 hours, 3 minutes later at 11:42 PM on June 22. 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 .
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