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Average Weather in Opaka Bulgaria

In Opaka, the summers are warm and mostly clear and the winters are freezing, dry, and partly cloudy. Over the course of the year, the temperature typically varies from 23°F to 83°F and is rarely below 9°F or above 92°F.

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

Climate Summary

very coldcoldcoolwarmcoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDecNowNow88%88%39%39%clearovercastprecipitation: 2.0 inprecipitation: 2.0 in1.0 in1.0 inmuggy: 14%muggy: 14%0%0%drydrytourism score: 7.6tourism score: 7.60.10.1
Click on each chart for more information.

Temperature

The warm season lasts for 3.6 months, from May 29 to September 16, with an average daily high temperature above 74°F. The hottest day of the year is August 1, with an average high of 83°F and low of 60°F.

The cold season lasts for 3.3 months, from November 24 to March 3, with an average daily high temperature below 45°F. The coldest day of the year is January 20, with an average low of 23°F and high of 35°F.

Average High and Low Temperature

Average High and Low Temperature in OpakawarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2035°FJan 2035°FAug 183°FAug 183°F23°F23°F60°F60°FMay 2974°FMay 2974°FSep 1674°FSep 1674°FNov 2445°FNov 2445°FMar 345°FMar 345°F53°F53°F51°F51°F31°F31°F28°F28°FNowNow
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 OpakaJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowfreezingfreezingvery coldvery coldcoldcoldcoolcomfortablewarmfreezingfreezing
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.

Frostburg, Maryland, United States (5,045 miles away) is the far-away foreign place with temperatures most similar to Opaka (view comparison).

Clouds

In Opaka, 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 Opaka begins around June 6 and lasts for 3.7 months, ending around September 28. On July 21, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 88% of the time, and overcast or mostly cloudy 12% of the time.

The cloudier part of the year begins around September 28 and lasts for 8.3 months, ending around June 6. On December 14, the cloudiest day of the year, the sky is overcast or mostly cloudy 61% of the time, and clear, mostly clear, or partly cloudy 39% of the time.

Cloud Cover Categories

Cloud Cover Categories in OpakaclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 2188%Jul 2188%Dec 1439%Dec 1439%Jun 663%Jun 663%Sep 2864%Sep 2864%NowNowclearmostly cloudyovercastpartly cloudymostly clear
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 Opaka varies throughout the year.

The wetter season lasts 2.7 months, from April 28 to July 18, with a greater than 22% chance of a given day being a wet day. The chance of a wet day peaks at 31% on June 3.

The drier season lasts 9.3 months, from July 18 to April 28. The smallest chance of a wet day is 13% on January 25.

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 in Opaka changes throughout the year.

Rain alone is the most common for 11 months, from February 2 to December 23. The highest chance of a day with rain alone is 31% on June 3.

Snow alone is the most common for 1.3 months, from December 23 to February 2. The highest chance of a day with snow alone is 8% on December 31.

Daily Chance of Precipitation

Daily Chance of Precipitation in OpakasnowrainJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jun 331%Jun 331%Jan 2513%Jan 2513%Dec 2318%Dec 2318%Apr 2822%Apr 2822%Jul 1822%Jul 1822%NowNowrainsnowmixed
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. Opaka experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 11 months, from February 9 to December 29, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around June 16, with an average total accumulation of 2.0 inches.

The rainless period of the year lasts for 1.3 months, from December 29 to February 9. The least rain falls around January 14, with an average total accumulation of 0.4 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

We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Opaka experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 5.6 months, from October 20 to April 9, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 1, with an average total liquid-equivalent accumulation of 0.7 inches.

The snowless period of the year lasts for 6.4 months, from April 9 to October 20. The least snow falls around July 19, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall in OpakasnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 inJan 10.7 inJan 10.7 inJul 190.0 inJul 190.0 inJan 10.7 inJan 10.7 inOct 200.1 inOct 200.1 inApr 90.1 inApr 90.1 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 Opaka varies significantly over the course of the year. In 2021, the shortest day is December 21, with 8 hours, 57 minutes of daylight; the longest day is June 21, with 15 hours, 25 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in OpakaJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2015 hr, 25 minJun 2115 hr, 25 minJun 2112 hr, 10 minSep 2212 hr, 10 minSep 228 hr, 57 minDec 218 hr, 57 minDec 21nightnightdayNowNow
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 5:33 AM on June 15, and the latest sunrise is 2 hours, 14 minutes later at 7:48 AM on January 3. The earliest sunset is at 4:38 PM on December 9, and the latest sunset is 4 hours, 21 minutes later at 9:00 PM on June 27.

Daylight saving time (DST) is observed in Opaka during 2021, starting in the spring on March 28, lasting 7.1 months, and ending in the fall on October 31.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in OpakaJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 155:33 AMJun 155:33 AM9:00 PMJun 279:00 PMJun 27Dec 94:38 PMDec 94:38 PM7:48 AMJan 37:48 AMJan 3Mar 28DSTMar 28DSTDSTOct 31DSTOct 31daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2021. 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.

Moon

The figure below presents a compact representation of key lunar data for 2021. 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.

Moon Rise, Set & Phases

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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.

Opaka experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 2.8 months, from June 3 to August 28, during which time the comfort level is muggy, oppressive, or miserable at least 3% of the time. The muggiest day of the year is July 26, with muggy conditions 14% of the time.

The least muggy day of the year is November 25, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in OpakamuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Nov 250%Nov 250%Jul 2614%Jul 2614%Jun 33%Jun 33%Aug 283%Aug 283%muggymuggyhumidhumidcomfortablecomfortabledrydry
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 Opaka experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.7 months, from November 9 to April 30, with average wind speeds of more than 8.0 miles per hour. The windiest day of the year is February 10, with an average hourly wind speed of 9.2 miles per hour.

The calmer time of year lasts for 6.3 months, from April 30 to November 9. The calmest day of the year is August 11, with an average hourly wind speed of 6.8 miles per hour.

Average Wind Speed

Average Wind Speed in OpakawindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mphFeb 109.2 mphFeb 109.2 mphAug 116.8 mphAug 116.8 mphNov 98.0 mphNov 98.0 mphApr 308.0 mphApr 308.0 mphNowNow
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 Opaka varies throughout the year.

The wind is most often from the south for 3.0 days, from April 26 to April 29 and for 1.4 weeks, from May 5 to May 15, with a peak percentage of 29% on May 6. The wind is most often from the east for 6.0 days, from April 29 to May 5; for 1.3 months, from July 29 to September 7; and for 2.9 weeks, from September 27 to October 17, with a peak percentage of 32% on August 20. The wind is most often from the west for 2.2 months, from May 15 to July 22; for 2.9 weeks, from September 7 to September 27; and for 6.3 months, from October 17 to April 26, with a peak percentage of 37% on June 14.

Wind Direction

Wind Direction in OpakaWSWEWEWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsoutheastnorth
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 Opaka 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 Opaka for general outdoor tourist activities is from early June to mid September, with a peak score in the last week of July.

Tourism Score

Tourism Score in Opakabest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.67.60.10.1NowNowprecipitationprecipitationcloudscloudstemperaturetemperaturetourism 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 Opaka for hot-weather activities is from early July to mid August, with a peak score in the first week of August.

Beach/Pool Score

Beach/Pool Score in Opakabest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.17.10.00.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperature beach/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 Opaka typically lasts for 6.5 months (200 days), from around April 9 to around October 26, rarely starting before March 19 or after May 1, and rarely ending before October 10 or after November 12.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Opakagrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 950%Apr 950%Oct 2650%Oct 2690%May 190%May 190%Oct 1090%Oct 1010%Mar 1910%Mar 1910%Nov 1210%Nov 120%Dec 200%Dec 20Jul 20100%Jul 20100%NowNowfreezingvery coldcoolcomfortablewarmhotfrigidcold
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 Opaka should appear around April 9, only rarely appearing before March 25 or after April 27.

Growing Degree Days

Growing Degree Days in OpakaJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°FApr 990°FApr 990°FJun 23900°FJun 23900°FAug 61,800°FAug 61,800°FDec 312,869°FDec 312,869°FNowNow
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 12 to August 23, with an average daily incident shortwave energy per square meter above 6.2 kWh. The brightest day of the year is July 8, with an average of 7.3 kWh.

The darker period of the year lasts for 3.5 months, from October 30 to February 15, with an average daily incident shortwave energy per square meter below 2.7 kWh. The darkest day of the year is December 24, with an average of 1.5 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in OpakabrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJul 87.3 kWhJul 87.3 kWhDec 241.5 kWhDec 241.5 kWhMay 126.2 kWhMay 126.2 kWhAug 236.2 kWhAug 236.2 kWhOct 302.7 kWhOct 302.7 kWhFeb 152.7 kWhFeb 152.7 kWhNowNow
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 Opaka are 43.450 deg latitude, 26.167 deg longitude, and 735 ft elevation.

The topography within 2 miles of Opaka contains very significant variations in elevation, with a maximum elevation change of 991 feet and an average elevation above sea level of 859 feet. Within 10 miles also contains very significant variations in elevation (1,250 feet). Within 50 miles contains very significant variations in elevation (5,020 feet).

The area within 2 miles of Opaka is covered by cropland (48%) and trees (40%), within 10 miles by cropland (61%) and trees (25%), and within 50 miles by cropland (59%) and trees (29%).

Data Sources

This report illustrates the typical weather in Opaka, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Opaka.

For each station, the records are corrected for the elevation difference between that station and Opaka 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 Opaka is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Opaka and a given station.

The stations contributing to this reconstruction are: Ruse Airport (41%, 48 kilometers, north); Gorna Orechovista (41%, 50 kilometers, southwest); Varna Airport (9%, 136 kilometers, east); and Burgas Airport (8%, 147 kilometers, southeast).

Other Data

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 airports 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.