Average Weather in October in Riga Latvia
Daily high temperatures decrease by 12°F, from 57°F to 45°F, rarely falling below 36°F or exceeding 64°F.
Daily low temperatures decrease by 8°F, from 43°F to 35°F, rarely falling below 25°F or exceeding 51°F.
For reference, on July 24, the hottest day of the year, temperatures in Riga typically range from 56°F to 74°F, while on February 7, the coldest day of the year, they range from 21°F to 31°F.
Average High and Low Temperature in October
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on October. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in October
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 month of October in Riga experiences rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 57% to 69%.
The clearest day of the month is October 1, with clear, mostly clear, or partly cloudy conditions 43% of the time.
For reference, on December 31, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 75%, while on July 30, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 57%.
Cloud Cover Categories in October
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Riga, the chance of a wet day over the course of October is essentially constant, remaining around 31% throughout.
For reference, the year's highest daily chance of a wet day is 33% on October 18, and its lowest chance is 18% on April 24.
Over the course of October in Riga, the chance of a day with only rain remains an essentially constant 30% throughout, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 0% throughout.
Probability of Precipitation in October
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during October in Riga is essentially constant, remaining about 1.9 inches throughout, and rarely exceeding 3.6 inches or falling below 0.7 inches.
Average Monthly Rainfall in October
Over the course of October in Riga, the length of the day is very rapidly decreasing. From the start to the end of the month, the length of the day decreases by 2 hours, 21 minutes, implying an average daily decrease of 4 minutes, 42 seconds, and weekly decrease of 32 minutes, 51 seconds.
The shortest day of the month is October 31, with 9 hours, 9 minutes of daylight and the longest day is October 1, with 11 hours, 30 minutes of daylight.
Hours of Daylight and Twilight in October
The latest sunrise of the month in Riga is 8:16 AM on October 24 and the earliest sunrise is 58 minutes earlier at 7:19 AM on October 25.
The latest sunset is 6:57 PM on October 1 and the earliest sunset is 2 hours, 16 minutes earlier at 4:41 PM on October 31.
Daylight saving time (DST) ends at 3:00 AM on October 25, 2020, shifting sunrise and sunset to be an hour earlier.
For reference, on June 20, the longest day of the year, the Sun rises at 4:29 AM and sets 17 hours, 52 minutes later, at 10:21 PM, while on December 21, the shortest day of the year, it rises at 9:00 AM and sets 6 hours, 44 minutes later, at 3:43 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in October
We 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 chance that a given day will be muggy in Riga is essentially constant during October, remaining around 0% throughout.
For reference, on August 1, the muggiest day of the year, there are muggy conditions 6% of the time, while on October 2, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in October
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
This 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 is increasing during October, increasing from 11.5 miles per hour to 12.7 miles per hour over the course of the month.
For reference, on January 21, the windiest day of the year, the daily average wind speed is 13.6 miles per hour, while on July 19, the calmest day of the year, the daily average wind speed is 9.1 miles per hour.
Average Wind Speed in October
The hourly average wind direction in Riga throughout October is predominantly from the south, with a peak proportion of 43% on October 29.
Wind Direction in October
Riga 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 surface water temperature in Riga is decreasing during October, falling by 7°F, from 55°F to 48°F, over the course of the month.
Average Water Temperature in October
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 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.
During October in Riga, the chance that a given day is within the growing season is very rapidly decreasing falling from 72% to 13% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in October
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.
The average accumulated growing degree days in Riga are gradually increasing during October, increasing by 40°F, from 1,648°F to 1,688°F, over the course of the month.
Growing Degree Days in October
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. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy in Riga is decreasing during October, falling by 1.3 kWh, from 2.3 kWh to 0.9 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in October
For the purposes of this report, the geographical coordinates of Riga are 56.946 deg latitude, 24.106 deg longitude, and 30 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%).
This report illustrates the typical weather in Riga year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There 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.
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.
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 aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The 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.