Average Weather in Graz Austria
In Graz, the summers are warm, the winters are freezing and dry, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 23°F to 78°F and is rarely below 12°F or above 88°F.
Based on the tourism score, the best time of year to visit Graz for warm-weather activities is from mid June to early September.
The warm season lasts for 3.6 months, from May 23 to September 11, with an average daily high temperature above 70°F. The hottest day of the year is July 31, with an average high of 78°F and low of 58°F.
The cold season lasts for 3.2 months, from November 20 to February 26, with an average daily high temperature below 44°F. The coldest day of the year is January 13, with an average low of 23°F and high of 36°F.
Average High and Low Temperature
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
In Graz, 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 Graz begins around June 14 and lasts for 3.4 months, ending around September 25. On July 22, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 65% of the time, and overcast or mostly cloudy 35% of the time.
The cloudier part of the year begins around September 25 and lasts for 8.6 months, ending around June 14. On November 20, the cloudiest day of the year, the sky is overcast or mostly cloudy 59% of the time, and clear, mostly clear, or partly cloudy 41% of the time.
Cloud Cover Categories
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. The chance of wet days in Graz varies throughout the year.
The wetter season lasts 5.1 months, from April 25 to September 29, with a greater than 25% chance of a given day being a wet day. The chance of a wet day peaks at 39% on June 16.
The drier season lasts 6.9 months, from September 29 to April 25. The smallest chance of a wet day is 11% on January 13.
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 39% on June 16.
Daily Chance of Precipitation
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. Graz experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Graz. The most rain falls during the 31 days centered around August 6, with an average total accumulation of 3.5 inches.
The least rain falls around January 18, with an average total accumulation of 0.5 inches.
Average Monthly Rainfall
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. Graz experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 4.3 months, from November 8 to March 17, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around December 28, with an average total liquid-equivalent accumulation of 0.3 inches.
The snowless period of the year lasts for 7.7 months, from March 17 to November 8. The least snow falls around July 29, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Graz varies significantly over the course of the year. In 2018, the shortest day is December 21, with 8 hours, 30 minutes of daylight; the longest day is June 21, with 15 hours, 54 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:02 AM on June 16, and the latest sunrise is 2 hours, 42 minutes later at 7:44 AM on January 1. The earliest sunset is at 4:08 PM on December 11, and the latest sunset is 4 hours, 49 minutes later at 8:57 PM on June 26.
Daylight saving time (DST) is observed in Graz 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
Graz experiences some seasonal variation in the perceived humidity.
The muggier period of the year lasts for 2.6 months, from June 11 to August 31, 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 27, with muggy conditions 10% of the time.
The least muggy day of the year is February 23, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Graz experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 4.3 months, from January 23 to June 1, with average wind speeds of more than 5.4 miles per hour. The windiest day of the year is April 3, with an average hourly wind speed of 6.3 miles per hour.
The calmer time of year lasts for 7.7 months, from June 1 to January 23. The calmest day of the year is August 10, with an average hourly wind speed of 4.6 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Graz varies throughout the year.
The wind is most often from the north for 7.6 months, from February 6 to September 24, with a peak percentage of 42% on July 21. The wind is most often from the south for 1.3 months, from September 24 to November 2, with a peak percentage of 32% on October 4. The wind is most often from the west for 3.1 months, from November 2 to February 6, with a peak percentage of 44% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Graz 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 Graz for general outdoor tourist activities is from mid June to early September, with a peak score in the second week of August.
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 Graz for hot-weather activities is from early July to mid August, with a peak score in the last week of July.
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.
The growing season in Graz typically lasts for 6.3 months (193 days), from around April 12 to around October 23, rarely starting before March 25 or after May 1, and rarely ending before October 5 or after November 15.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Graz should appear around April 15, only rarely appearing before April 2 or after May 1.
Growing Degree Days
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 3.7 months, from April 28 to August 18, with an average daily incident shortwave energy per square meter above 5.5 kWh. The brightest day of the year is July 8, with an average of 6.6 kWh.
The darker period of the year lasts for 3.4 months, from October 29 to February 12, with an average daily incident shortwave energy per square meter below 2.3 kWh. The darkest day of the year is December 16, with an average of 1.2 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Graz are 47.067 deg latitude, 15.450 deg longitude, and 1,207 ft elevation.
The topography within 2 miles of Graz contains only modest variations in elevation, with a maximum elevation change of 459 feet and an average elevation above sea level of 1,223 feet. Within 10 miles contains only modest variations in elevation (3,766 feet). Within 50 miles also contains extreme variations in elevation (7,323 feet).
The area within 2 miles of Graz is covered by artificial surfaces (97%), within 10 miles by trees (42%) and cropland (28%), and within 50 miles by trees (56%) and cropland (26%).
This report illustrates the typical weather in Graz, 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 Graz.
For each station, the records are corrected for the elevation difference between that station and Graz 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 Graz is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Graz and a given station.
The stations contributing to this reconstruction are: Graz Airport (91%, 8 kilometers, south); Zeltweg Airport (4.8%, 56 kilometers, west); Szombathely (2.7%, 92 kilometers, east); and Fliegerhorst Brumowski (1.3%, 148 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .