St Helena Weather Forecasts. 62.1 ºF We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. The amount of rain in December is high with an average of 82mm (3.2in). Within 10 miles contains very significant variations in elevation (2,841 feet). The windiest day of the year is June 14, with an average hourly wind speed of 7.2 miles per hour. W 6 mph. Based on this score, the best time of year to visit Saint Helena for general outdoor tourist activities is from late June to mid September, with a peak score in the last week of July. The predominant average hourly wind direction in Saint Helena varies throughout the year. Showing: All Year Climate & Weather Averages in Jamestown. The average water temperature experiences some seasonal variation over the course of the year. Bookmark and Share. St. Helena averages 0 inches of snow per year. 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 . Climate (2011–Present) Petaluma Municipal Airport (18 miles) Take a look at our website widgetsAvailable free! St. Helena, California gets 37 inches of rain, on average, per year. Lower dew points feel drier and higher dew points feel more humid. The stations contributing to this reconstruction are: Sonoma County Airport (35%, 30 kilometers, west); Napa County Airport (25%, 37 kilometers, southeast); Gnoss Field (22%, 40 kilometers, south); and Nut Tree Airport (18%, 47 kilometers, east). Temperature 20 °C 68 °F; High Temperature 23 °C 73 °F; Low Temperature 17 °C 63 °F; Sunshine Hours 5 hours; Rainfall 60 mm; Rainfall Days 10 days 44 F Charles M. Schulz-Sonoma County Airport Station | Report. 0.00 inch: 0.28 inch: Total snowfall Total snowfall - inch: 0 inch: Highest max temperature Highest max temp. Figures in brackets [] are percentages of the annual total.. Frost Advisory in effect from Monday, 3:00 AM PST until Monday, 9:00 AM PST. 4%. Northwest winds 5 to 10 mph. 99.0 ºF -Lowest max temperature Lowest max temp. Get the monthly weather forecast for St. Helena, CA, including daily high/low, historical averages, to help you plan ahead. From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night. This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. Saint Helena, CA Traffic. July is the hottest month for St. Helena with an average high temperature of 88.8°, which ranks it as about average compared to other places in California. The chance of wet days in Saint Helena varies significantly throughout the year. Get the monthly weather forecast for St. Helena, CA, including daily high/low, historical averages, to help you plan ahead. See the current St. Helena, CA weather and a 5 day forecast. Meanwhile, San Rafael’s winters are cold and short with highs of 59°F and lows of 42°F. Strongest 6 June, 2020 … Also view: monthly average temperatures, precipitation, snow depth, wind speed, air quality and pollution. The amount of rain in July is extremely low with an average of 0mm (0.0in). The coldest month is December with an average maximum temperature of 12°C (53°F). Weather is too cold this time of year in St Helena to be enjoyable for warm weather travelers. The time of year with cooler water lasts for 3.1 months, from March 23 to June 27, with an average temperature below 53°F. 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. Precipitation is rain, snow, sleet, or hail that falls to the ground. The average minimum temperature (usually the minimum temperature is noted during the night) in St. Helena in December is 3.6°C (38.48°F). Report Station. The chance of a wet day peaks at 33% on February 20. Find the most current and reliable 14 day weather forecasts, storm alerts, reports and information for Saint Helena, CA, US with The Weather Network. It is 721% greater than the overall U.S. average. March 2019 cost of living index in St. Helena: 156.3 (very high, U.S. average is 100) St. Helena, CA residents, houses, and apartments details. The US average is 28 inches of snow per year. 88.0 ºF: 86 ºF: Average low temperature Av. St. Helena, California - Travel and vacation weather averages, current conditions and forecasts. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

This nation-wide website presents information about the weather and climate for almost every country around the world.Learn more. The rainless period of the year lasts for 4.0 months, from May 27 to September 28. St Helena, Warwickshire, United Kingdom - Monthly weather averages including average high and low Temperature, Precipitation, Pressure, Wind Charts to assist you in planning your travel, holiday or an outdoor activity at St Helena, United Kingdom UV Index 2 of 10. For each station, the records are corrected for the elevation difference between that station and Saint Helena according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. The US average is 38 inches of rain per year. The calmer time of year lasts for 6.8 months, from August 21 to March 13. The amount of rain in August … The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year. To characterize how pleasant the weather is in Saint Helena throughout the year, we compute two travel scores. The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. April is a dry month with an average of 29mm (1.1in) rain. The smallest chance of a wet day is 0% on July 24. Over the course of the year, the temperature typically varies from 36°F to 90°F and is rarely below 27°F or above 100°F . Averages are for Saint Helena Island, which is 4 miles from Jamestown. The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than. The windier part of the year lasts for 5.2 months, from March 13 to August 21, with average wind speeds of more than 6.7 miles per hour. This has got to be one of the mildest climates whose averages are close to a typical "room temperature" much of the year. Saint Helena experiences extreme seasonal variation in monthly rainfall. Based on growing degree days alone, the first spring blooms in Saint Helena should appear around February 20, only rarely appearing before February 7 or after March 7. See the current St. Helena, CA weather and a 5 day forecast. Average High Average Low Record High Record Low Average Precipitation. St Helena rain forecast information. The darker period of the year lasts for 3.6 months, from November 2 to February 20, with an average daily incident shortwave energy per square meter below 3.3 kWh. The calmest day of the year is October 31, with an average hourly wind speed of 6.1 miles per hour. The darkest day of the year is December 25, with an average of 2.0 kWh. The hot season lasts for 4.0 months, from June 5 to October 5, with an average daily high temperature above 83°F. Monthly average temperatures, rainfall, snow days & record high and low temperatures msn back to msn home weather records and averages powered by Microsoft News The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. The highest monthly average temperature in St. Helena for July is 65 degrees; The lowest monthly average temperature in St. Helena for December is 46 degrees; The most monthly precipitation in St. Helena occurs in December with 6.9 inches; The air quality index in St. Helena … Chance of rainfall chart with likely precipitation and statistics in live rain gauge St Helena Rainfall Forecast, CA 94574 - WillyWeather Figures in brackets [] are percentages of the annual total.. We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Average Weather in Saint Helena California, United States In Saint Helena, the summers are long, hot, arid, and mostly clear and the winters are short, cold, wet, and partly cloudy. NOAA National Weather Service National Weather Service. 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. low temp. The percentage of time spent in various temperature bands. Based on weather reports collected during 2005–2015. The City of St. Helena has its own sensor located at the Parks & Recreation Department building on Railroad Ave. Other Air Quality Reporting Agencies: Bay Area Air Quality Management District (Air District) The California wildfire season takes place between spring and early fall. High Temp: 86 °F. High 59F. The average hourly wind speed in Saint Helena experiences mild seasonal variation over the course of the year. 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 length of the day in Saint Helena varies significantly over the course of the year. Santiago, Chile (5,986 miles away) and Shepparton, Australia (7,825 miles) are the far-away foreign places with temperatures most similar to Saint Helena (view comparison). This section reports on the wide-area average surface temperature of that water. On average, it rains or snows a fair amount: 5 to 9 times per month. Average Weather during December in St. Helena (California), United States of America. 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. The percentage of time spent at various humidity comfort levels, categorized by dew point. Showing: All Year Climate & Weather Averages in Jamestown. The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands. Based on weather reports collected during 1985–2015. Lows in the mid 30s to upper 40s. Figures, provided by the St Helena Meteorological Station, are monthly averages taken at the station over the years 2001-2018 (North-west island temperatures - e.g. These times of year are fairly slow with tourists. The coldest day of the year is December 31, with an average low of 36°F and high of 54°F. MERRA-2 Modern-Era Retrospective Analysis. Weather data is prone to errors, outages, and other defects. At 7.8 °C | 46.0 °F on average, January is the coldest month of the year. St Helena Weather Forecasts. Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory. 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