Climate and Average Weather Year Round in Riga LatviaIn Riga, the summers are comfortable and partly cloudy and the winters are long, freezing, snowy, windy, and mostly cloudy. Over the course of the year, the temperature typically varies from 21°F to 74°F and is rarely below 2°F or above 83°F. Based on the tourism score, the best time of year to visit Riga for warm-weather activities is from late June to mid August. Average Temperature in RigaThe warm season lasts for 3.4 months, from May 24 to September 5, with an average daily high temperature above 65°F. The hottest month of the year in Riga is July, with an average high of 73°F and low of 56°F. The cold season lasts for 3.9 months, from November 17 to March 15, with an average daily high temperature below 39°F. The coldest month of the year in Riga is January, with an average low of 23°F and high of 31°F.
The figure below shows you a compact characterization of the entire year of hourly average temperatures. 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. Terrace, Canada (4,589 miles away) and Revelstoke, Canada (4,682 miles) are the far-away foreign places with temperatures most similar to Riga (view comparison). CloudsIn Riga, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year. The clearer part of the year in Riga begins around April 12 and lasts for 5.9 months, ending around October 9. The clearest month of the year in Riga is July, during which on average the sky is clear, mostly clear, or partly cloudy 56% of the time. The cloudier part of the year begins around October 9 and lasts for 6.1 months, ending around April 12. The cloudiest month of the year in Riga is January, during which on average the sky is overcast or mostly cloudy 74% of the time.
PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Riga varies throughout the year. The wetter season lasts 8.0 months, from May 27 to January 25, with a greater than 26% chance of a given day being a wet day. The month with the most wet days in Riga is October, with an average of 9.8 days with at least 0.04 inches of precipitation. The drier season lasts 4.0 months, from January 25 to May 27. The month with the fewest wet days in Riga is April, with an average of 6.1 days with at least 0.04 inches of precipitation. Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Riga is October, with an average of 9.4 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 32% on August 23.
RainfallTo show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Riga experiences some seasonal variation in monthly rainfall. Rain falls throughout the year in Riga. The month with the most rain in Riga is June, with an average rainfall of 2.3 inches. The month with the least rain in Riga is February, with an average rainfall of 0.8 inches.
SnowfallAs with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Riga experiences significant seasonal variation in monthly snowfall. The snowy period of the year lasts for 4.9 months, from November 1 to March 30, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Riga is December, with an average snowfall of 4.8 inches. The snowless period of the year lasts for 7.0 months, from March 30 to November 1. The least snow falls around July 27, with an average total accumulation of 0.0 inches.
SunThe length of the day in Riga varies extremely over the course of the year. In 2024, the shortest day is December 21, with 6 hours, 43 minutes of daylight; the longest day is June 20, with 17 hours, 53 minutes of daylight.
The earliest sunrise is at 4:28 AM on June 18, and the latest sunrise is 4 hours, 33 minutes later at 9:01 AM on December 28. The earliest sunset is at 3:41 PM on December 14, and the latest sunset is 6 hours, 40 minutes later at 10:21 PM on June 23. Daylight saving time (DST) is observed in Riga during 2024, starting in the spring on March 31, lasting 6.9 months, and ending in the fall on October 27. Sunrise & Sunset with Twilight and Daylight Saving Time in Riga
The solar day over the course of the year 2024. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.
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. Solar Elevation and Azimuth in Riga
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Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).
MoonThe figure below presents a compact representation of key lunar data for 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. 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 perceived humidity level in Riga, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 3% of 3% throughout.
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 in Riga experiences significant seasonal variation over the course of the year. The windier part of the year lasts for 5.8 months, from September 26 to March 20, with average wind speeds of more than 11.3 miles per hour. The windiest month of the year in Riga is January, with an average hourly wind speed of 13.5 miles per hour. The calmer time of year lasts for 6.2 months, from March 20 to September 26. The calmest month of the year in Riga is July, with an average hourly wind speed of 9.2 miles per hour.
The predominant average hourly wind direction in Riga varies throughout the year. The wind is most often from the north for 4.0 weeks, from April 21 to May 19, with a peak percentage of 29% on May 16. The wind is most often from the west for 4.1 months, from May 19 to September 21, with a peak percentage of 36% on August 14. The wind is most often from the south for 7.0 months, from September 21 to April 21, with a peak percentage of 39% on January 1. Wind Direction in Riga
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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 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).
Water TemperatureRiga 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 water temperature experiences significant seasonal variation over the course of the year. The time of year with warmer water lasts for 2.7 months, from June 27 to September 19, with an average temperature above 58°F. The month of the year in Riga with the warmest water is August, with an average temperature of 64°F. The time of year with cooler water lasts for 4.2 months, from December 18 to April 24, with an average temperature below 39°F. The month of the year in Riga with the coolest water is February, with an average temperature of 33°F.
Best Time of Year to VisitTo characterize how pleasant the weather is in Riga throughout the year, we compute two travel scores. The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Riga for general outdoor tourist activities is from late June to mid August, with a peak score in the third week of July. Tourism Score in Riga
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Riga for hot-weather activities is from mid July to early August, with a peak score in the last week of July. Beach/Pool Score in Riga
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
MethodologyFor 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. 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. 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. 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. 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. 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. 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). The growing season in Riga typically lasts for 5.3 months (164 days), from around May 1 to around October 11, rarely starting before April 12 or after May 19, and rarely ending before September 18 or after November 2. Time Spent in Various Temperature Bands and the Growing Season in Riga
frigid
15°F
freezing
32°F
very cold
45°F
cold
55°F
cool
65°F
comfortable
75°F
warm
85°F
hot
95°F
sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.
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. Based on growing degree days alone, the first spring blooms in Riga should appear around May 6, only rarely appearing before April 27 or after May 19. 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 experiences extreme seasonal variation over the course of the year. The brighter period of the year lasts for 3.4 months, from May 1 to August 12, with an average daily incident shortwave energy per square meter above 5.0 kWh. The brightest month of the year in Riga is June, with an average of 6.1 kWh. The darker period of the year lasts for 4.1 months, from October 17 to February 22, with an average daily incident shortwave energy per square meter below 1.5 kWh. The darkest month of the year in Riga is December, with an average of 0.3 kWh.
TopographyFor the purposes of this report, the geographical coordinates of Riga are 56.946 deg latitude, 24.106 deg longitude, and 20 ft elevation. The topography within 2 miles of Riga is essentially flat, with a maximum elevation change of 95 feet and an average elevation above sea level of 25 feet. Within 10 miles is essentially flat (154 feet). Within 50 miles contains only modest variations in elevation (886 feet). The area within 2 miles of Riga is covered by artificial surfaces (81%) and water (18%), within 10 miles by trees (31%) and artificial surfaces (25%), and within 50 miles by trees (37%) and cropland (28%). Data SourcesThis report illustrates the typical weather in Riga, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Temperature and Dew PointThere is only a single weather station, Riga, in our network suitable to be used as a proxy for the historical temperature and dew point records of Riga. At a distance of 4 kilometers from Riga, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records. The station records are corrected for the elevation difference between the station and Riga according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis. 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. We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader. Please review our full terms contained on our Terms of Service page. |