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Average Weather in Cosio Valtellino Italy

In Cosio Valtellino, the summers are comfortable and wet, the winters are very cold, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 29°F to 76°F and is rarely below 22°F or above 82°F.

Based on the tourism score, the best time of year to visit Cosio Valtellino for warm-weather activities is from late June to early September.

Climate Summary

very coldcoldcoolcomfortablewarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDec68%68%40%40%overcastclearprecipitation: 4.6 inprecipitation: 4.6 in1.6 in1.6 inmuggy: 2%muggy: 2%0%0%drydrytourism score: 7.4tourism score: 7.40.00.0
Click on each chart for more information.

Temperature

The warm season lasts for 3.1 months, from June 6 to September 10, with an average daily high temperature above 69°F. The hottest day of the year is July 26, with an average high of 76°F and low of 61°F.

The cold season lasts for 3.7 months, from November 19 to March 8, with an average daily high temperature below 47°F. The coldest day of the year is January 12, with an average low of 29°F and high of 40°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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.

Average Hourly Temperature

Average Hourly Temperature in Cosio ValtellinoJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfreezingvery coldvery coldcoldcoldcoolcomfortablefreezingcomfortable
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Coquitlam, Canada (5,256 miles away); Boone, North Carolina, United States (4,534 miles); and Edgartown, Massachusetts, United States (3,839 miles) are the far-away foreign places with temperatures most similar to Cosio Valtellino (view comparison).

Clouds

In Cosio Valtellino, 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 Cosio Valtellino begins around June 19 and lasts for 3.0 months, ending around September 18. On July 29, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 68% of the time, and overcast or mostly cloudy 32% of the time.

The cloudier part of the year begins around September 18 and lasts for 9.0 months, ending around June 19. On May 8, the cloudiest day of the year, the sky is overcast or mostly cloudy 60% of the time, and clear, mostly clear, or partly cloudy 40% of the time.

Cloud Cover Categories

Cloud Cover Categories in Cosio ValtellinoclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 2968%Jul 2968%May 840%May 840%Jun 1954%Jun 1954%Sep 1854%Sep 1854%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Cosio Valtellino varies throughout the year.

The wetter season lasts 6.2 months, from April 6 to October 11, with a greater than 29% chance of a given day being a wet day. The chance of a wet day peaks at 42% on June 2.

The drier season lasts 5.8 months, from October 11 to April 6. The smallest chance of a wet day is 16% on February 8.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 42% on June 2.

Daily Chance of Precipitation

Daily Chance of Precipitation in Cosio ValtellinowetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jun 242%Jun 242%Feb 816%Feb 816%Jan 120%Jan 120%Apr 629%Apr 629%Oct 1129%Oct 1129%rainmixed
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To 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. Cosio Valtellino experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Cosio Valtellino. The most rain falls during the 31 days centered around May 23, with an average total accumulation of 4.6 inches.

The least rain falls around February 2, with an average total accumulation of 1.4 inches.

Average Monthly Rainfall

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 thin dotted line is the corresponding average liquid-equivalent snowfall.

Snowfall

The sliding 31-day liquid-equivalent quantity of snowfall in Cosio Valtellino does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall in Cosio ValtellinosnowJanFebMarAprMayJunJulAugSepOctNovDec0 in1 in2 in3 in4 in5 inJan 150.2 inJan 150.2 inAug 60.0 inAug 60.0 inDec 100.1 inDec 100.1 inFeb 210.1 inFeb 210.1 in
The average liquid-equivalent snowfall (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 thin dotted line is the corresponding average rainfall.

Sun

The length of the day in Cosio Valtellino varies significantly over the course of the year. In 2018, the shortest day is December 21, with 8 hours, 37 minutes of daylight; the longest day is June 21, with 15 hours, 46 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in Cosio ValtellinoJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 9 minMar 2012 hr, 9 minMar 2015 hr, 46 minJun 2115 hr, 46 minJun 2112 hr, 11 minSep 2312 hr, 11 minSep 238 hr, 37 minDec 218 hr, 37 minDec 21nightnightday
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:29 AM on June 16, and the latest sunrise is 2 hours, 34 minutes later at 8:04 AM on January 1. The earliest sunset is at 4:35 PM on December 11, and the latest sunset is 4 hours, 41 minutes later at 9:17 PM on June 26.

Daylight saving time (DST) is observed in Cosio Valtellino during 2018, starting in the spring on March 25, lasting 7.1 months, and ending in the fall on October 28.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in Cosio ValtellinoJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 165:29 AMJun 165:29 AM9:17 PMJun 269:17 PMJun 26Dec 114:35 PMDec 114:35 PM8:04 AMJan 18:04 AMJan 1Mar 25DSTMar 25DSTDSTOct 28DSTOct 28daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2018. 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.

Humidity

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 perceived humidity level in Cosio Valtellino, 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 1% of 1% throughout.

Humidity Comfort Levels

Humidity Comfort Levels in Cosio ValtellinoJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Mar 150%Mar 150%Jul 312%Jul 312%comfortablecomfortabledrydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

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 Cosio Valtellino does not vary significantly over the course of the year, remaining within 0.4 miles per hour of 3.7 miles per hour throughout.

Average Wind Speed

Average Wind Speed in Cosio ValtellinoJanFebMarAprMayJunJulAugSepOctNovDec0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mphMar 314.2 mphMar 314.2 mphOct 193.3 mphOct 193.3 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Cosio Valtellino varies throughout the year.

The wind is most often from the south for 5.5 months, from April 21 to October 7, with a peak percentage of 45% on May 25. The wind is most often from the north for 6.5 months, from October 7 to April 21, with a peak percentage of 70% on January 1.

Wind Direction

Wind Direction in Cosio ValtellinoNSNJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%southnortheastwest
northeastsouthwest
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).

Best Time of Year to Visit

To characterize how pleasant the weather is in Cosio Valtellino 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 Cosio Valtellino for general outdoor tourist activities is from late June to early September, with a peak score in the last week of July.

Tourism Score

Tourism Score in Cosio Valtellinobest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.47.40.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
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 Cosio Valtellino for hot-weather activities is from early July to mid August, with a peak score in the last week of July.

Beach/Pool Score

Beach/Pool Score in Cosio ValtellinoJanFebMarAprMayJunJulAugSepOctNovDec02468105.35.30.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
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).

Methodology

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. 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 Season

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 Cosio Valtellino typically lasts for 7.6 months (234 days), from around March 28 to around November 17, rarely starting before March 4 or after April 21, and rarely ending before October 28 or after December 10.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Cosio Valtellinogrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Mar 2850%Mar 2850%Nov 1750%Nov 1790%Apr 2190%Apr 2190%Oct 2890%Oct 2810%Mar 410%Mar 410%Dec 1010%Dec 100%Jan 270%Jan 27Jul 28100%Jul 28100%freezingvery coldcoldcoolcomfortablewarm
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 Cosio Valtellino should appear around April 28, only rarely appearing before April 16 or after May 16.

Growing Degree Days

The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.3 months, from May 10 to August 19, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest day of the year is July 5, with an average of 6.9 kWh.

The darker period of the year lasts for 3.4 months, from October 27 to February 8, with an average daily incident shortwave energy per square meter below 2.6 kWh. The darkest day of the year is December 16, with an average of 1.5 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Cosio ValtellinobrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJul 56.9 kWhJul 56.9 kWhDec 161.5 kWhDec 161.5 kWhMay 105.8 kWhMay 105.8 kWhAug 195.8 kWhAug 195.8 kWhOct 272.6 kWhOct 272.6 kWhFeb 82.6 kWhFeb 82.6 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Cosio Valtellino are 46.135 deg latitude, 9.552 deg longitude, and 2,218 ft elevation.

The topography within 2 miles of Cosio Valtellino contains extreme variations in elevation, with a maximum elevation change of 3,799 feet and an average elevation above sea level of 1,591 feet. Within 10 miles also contains extreme variations in elevation (9,114 feet). Within 50 miles also contains extreme variations in elevation (12,867 feet).

The area within 2 miles of Cosio Valtellino is covered by trees (52%), cropland (25%), and artificial surfaces (14%), within 10 miles by trees (58%) and grassland (16%), and within 50 miles by trees (41%) and grassland (16%).

Data Sources

This report illustrates the typical weather in Cosio Valtellino, 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 are 6 weather stations near enough to contribute to our estimation of the temperature and dew point in Cosio Valtellino.

For each station, the records are corrected for the elevation difference between that station and Cosio Valtellino according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Cosio Valtellino is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Cosio Valtellino and a given station.

The stations contributing to this reconstruction are: Monte Bisbino (18%, 48 kilometers, southwest); Lugano Airport (25%, 52 kilometers, west); Locarno Airport (22%, 52 kilometers, west); Il Caravaggio International Airport (23%, 53 kilometers, south); Resia Pass (7%, 106 kilometers, northeast); and Paganella (meteorological station) (5%, 114 kilometers, east).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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.

Disclaimer

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.