The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day. The number of hours during which the Sun is visible (black line). The shaded overlays indicate night and civil twilight. Therefore, it is important to maximize caution while swimming and to avoid beaches that are not sheltered by coral reefs. Although the sea appears to be calm, the swell gives no warning before taking over the smooth waters. The percentage of time spent at various humidity comfort levels, categorized by dew point. 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. support@__remove_this_part__weatherspark.com. The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands. August, the last month of the winter, in Ascension Island, is also a moderately hot month, with average temperature fluctuating between 28°C (82.4°F) and 22°C (71.6°F). google_ad_height = 15; 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. Based on this score, the best time of year to visit RAF Ascension Island for general outdoor tourist activities is from mid June to late September, with a peak score in the last week of July. 22 October 2020 at 11:00-12:00: Fair, Temperature 22, 0 mm, Moderate breeze, 6 m/s from east The predominant average hourly wind direction at RAF Ascension Island is from the east throughout the year. 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 thin dotted line is the corresponding average liquid-equivalent snowfall. However, the climate is not as hot as it might seems; indeed, the heat of the sun is outweighed by the sudden gusts of wind which blow over the island. However, the climate is not as hot as it might seems; indeed, the heat of the sun is outweighed by the sudden gusts of wind which blow over the island. Forever veiled by clouds, "Green Mountain" possesses a true microclimate. The windiest day of the year is August 14, with an average hourly wind speed of 16.3 miles per hour. Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations. The average temperature reaches a maximum of 88ºF (31ºC) during the months of January, February and March and temperatures generally stay within the range of 71°F (22ºC) to 88°F (31ºC) all year round. 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 . 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. The clearer part of the year at RAF Ascension Island begins around May 18 and lasts for 3.6 months, ending around September 5. This particular occurrence always arouses the same question in our minds: how can we be having such heavy and swelling waves especially when the wind has not gained high speed? The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds. Ascension Island Weather, free ascension island weather software downloads, Page 3. It is in December, the hottest period of the year, that we can observe the arrival of turtles and the occurrence of the "swell" phenomenon which is aptly described as the breaking and collapsing of huge rollers on beaches in a thundering crash. The average hourly wind speed at RAF Ascension Island experiences significant seasonal variation over the course of the year. * NOTE: not all live weather reports for Ascension Island update at the same frequency which is why some locations can show data from stations that are more remote if … This report illustrates the typical weather at RAF Ascension Island, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Over the course of the year, the temperature typically varies from 72°F to 86°F and is rarely below 70°F or above 88°F. Seasonal, Weather. The frequency ranges from 0% to 4%, with an average value of 1%. An excellent water temperature of 25°C (77°F) and only 3 rainfall days, with 11mm (0.4") of accumulated rainfall, makes August a prime for swimming and other water activities. Average Weather at RAF Ascension Island St. Helena. 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. On July 22, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 84% of the time, and overcast or mostly cloudy 16% of the time. The time of year with cooler water lasts for 3.9 months, from August 6 to December 2, with an average temperature below 77°F. Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database . Please choose your location from the nearest places … One minute the weather is as clear a bell. Up to 90 days of daily highs, lows, and precipitation chances. RAF Ascension Island experiences extreme seasonal variation in the perceived humidity. Showing: All Year January February March April May June July August September October November December The brightest day of the year is February 13, with an average of 7.0 kWh. Rain falls all year round with slightly more significant downpours in the period of January to April. The calmest day of the year is February 2, with an average hourly wind speed of 12.9 miles per hour. The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. The earliest sunset is at 6:45 PM on May 24, and the latest sunset is 39 minutes later at 7:24 PM on January 30. Ascension (St Helena - Ascension and Tristan Da Cunha) weather. To better understand this phenomenon, we should distinguish between the sea waves and the swell waves. Ascension Island sea surface temperature in winter In December sea water temperature throughout Ascension Island warms above 20°C/68°F and it is enough for a comfortable bath. Search for a place, autocomplete also includes a 'Use my location' option and your recent locations Search. In 2020, the shortest day is June 20, with 11 hours, 40 minutes of daylight; the longest day is December 21, with 12 hours, 35 minutes of daylight. Annual Weather Averages in Georgetown (Ascension Island) Based on weather reports collected during 1985–2015. Click "Accept and continue" to accept all cookies, or click below, to change your cookie settings. The hurricanes in the surroundings of the Falkland Islands can generate huge waves that will reach Ascension four to six days later. Find a forecast. This is for your internet explorer or firefox. At sea level, the temperature can vary from 20°C to 31°C. //-->. other name: Island of Ascension: country: Saint Helena, Ascension and Tristan da Cunha: Ascension: Altitude: ca. Travel in Ascension island, weather information. The consistent weather, uncluttered airspace and flexible access to the runway make Ascension Island a valuable training environment.” The Ascension Island is one of Britain’s oldest and most remote possessions. The muggier period of the year lasts for 8.2 months, from November 2 to July 7, during which time the comfort level is muggy, oppressive, or miserable at least 55% of the time. The area within 2 miles of RAF Ascension Island is covered by water (73%) and grassland (21%), within 10 miles by water (98%), and within 50 miles by water (100%). A British Overseas Territory, like the Falklands, Ascension is an arid island where the temperature rarely dips below 20C. The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. 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. The black line is the percentage chance that a given day is within the growing season. Use my current location. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year. The cloudier part of the year begins around September 5 and lasts for 8.4 months, ending around May 18. google_ad_slot = "1750214043"; We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Based on this score, the best time of year to visit RAF Ascension Island for hot-weather activities is from mid May to late August, with a peak score in the last week of June. 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 hourly temperature, color coded into bands. Based on the beach/pool score, the best time of year to visit RAF Ascension Island for hot-weather activities is from mid May to late August. 345 a.s.l. The climate at RAF Ascension Island is warm, muggy, extremely windy, and partly cloudy. 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 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 earliest sunrise is at 6:27 AM on November 15, and the latest sunrise is 45 minutes later at 7:12 AM on July 15. Click on each chart for more information. Today's sea temperature in Ascension Island is 25.2 ° C (Statistics for 09 Dec 1981-2005 – mean: 25.0 max: 25.7 min: 24.4 ° C) Summary some clouds The blend of heat and humidity dissipates daylight and provides an excellent explanation for the "foggy" landscapes. At sea level, the temperature can vary from 20°C to 31°C. helping us to finance a high quality free-of-charge precision weather service. The average daily incident shortwave solar energy experiences some seasonal variation over the course of the year. Long Island Home Inspection Toolbar. When available, historical temperature and dew point measurements are taken directly from this weather station. The November weather guide for Ascension Island, St Helena & Islands shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. 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. meteoblue uses the Google ad network which potentially could deliver ads from any of the advertising companies that are listed here: Further information . The muggiest day of the year is March 20, with muggy conditions 100% of the time. Here, the days are short and brief; the sun rises at 6h30 and sets at 18h00. WINTER 2020-21: A season of extremes across Canada. Choose any offshore point in Ascension Island to view an accurate marine weather forecast. Ascension Island, Saint Helena, Ascension and Tristan da Cunha - August weather averages including high and low temperatures, humidity, rainfall, snowfall, … The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands. The satellite image shows nary a cloud near the island, the dew-point is low and all is well in the world. 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. Sea waves, which are generated by winds, are natives of the surrounding area while the stormy waves, which originate from the Atlantic Ocean, are formed in remote zones 3’000 km far and managed to make the trip to the coasts of Ascension. 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. The windier part of the year lasts for 8.4 months, from March 31 to December 13, with average wind speeds of more than 14.6 miles per hour. From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.