The weather-station is sited in Vienna-Penzing (48:11 Nord, 16:17 Ost, 201m), Österreich (Vienna/Austria) , on a deck, so the temperature can be up to  1-2 degree higher. 

La Crosse
WS2315 Wireless Weather-Station (baught at Conrad

Atomic clock automatically sets time and date displays to WWVB radio signal (manual setting is also possible). 
Display of extensive weather data, with programmable alarm functions for certain weather conditions as well as records of all minimum and maximum values along with the time and date they were recorded. 
Indoor and outdoor temperature displays in °F or °C (user-selectable). 
Indoor and outdoor relative humidity displays. 
Air pressure reading in inHg (inches of mercury) or hPa (hecto Pascals), absolute or relative (user-selectable). 
Detailed display of rainfall data (1 hour, 24 hours, total since last reset), user-selectable for inches or millimeters. 
Self-emptying rain gauge sender. 
Wind velocity in mph, km/h, m/s, knots, or Beaufort (user-selectable) 
Wind direction display with LCD compass as well as numerical (e.g., 225°) and abbreviated characters (e.g., SW). 
Wind chill factor display. 
Dew point temperature display. 

Weather forecast display by weather icons (sunny, cloudy, rainy). 
Weather (barometric pressure) tendency indicator 
Storm warning alarm. 
Large, user-friendly LCD display of all weather data. 
LED backlight for LCD display. 
COM port for connection to your PC. 
Simultaneous display of all weather data with individual settings by the user. 
All the weather data from the base station and up to 175 sets of weather history data with user-adjustable measuring intervals can be recorded and uploaded to your PC for further processing (e.g., spread sheet, etc.). 
Indoor temperature measuring range: 14.1° to 139.8°F (-9.9° to 59.9°C) 
Outdoor temperature measuring range: -21.8° to 157.8°F (-29.9° to 69.9°C) 
Temperature resolution: 0.2°F (0.1°C) 
Indoor and outdoor relative humidity measuring range: 20% to 95% 
Relative humidity resolution: 1% 
Barometric pressure measuring range: 8.85 to 32.45 inHg (300 to 1100 hPa) 
Air pressure resolution: 0.01 inHg (0.3 hPa) 
Wind speed measuring range: 0 to 111.8 mph (0 to 180 kph) 
Wind speed resolution: 0.1 mph (0.1 km/h) 
Wind direction: graphic resolution 22.5° 

Rainfall measuring range:
0 to 39.37 inches (0 to 999.9 mm) for 1h and 24h rainfall
0 to 98.38 inches (0 to 2498.9 mm) for total rainfall 
Transmission range (each transmitter): 100 feet (30 meters) maximum in open space with no interference 
Dimensions (H x W x D): 
Base station: 6.3 x 6.1 x 1.2 inches (160 x 155 x 30.5 mm) 
Thermo-hygro sensor: 5.4 x 2.8 x 2.9 inches
(137 x 71 x 74 mm) 
Rain sensor: 5.4 x 5.5 x 2.8 inches (137 x 140 x 74 mm) 
Wind sensor: 7.7 x 11.5 x 2.4 inches (196 x 292 x 61 mm) 
Power requirements, base station:
3 AA ( 1.5V) alkaline batteries, or 120Vac 60Hz if the supplied ac adapter is used. Battery life is approximately 12 months unless the data-link cable is used, in which case it is approximately 6 months. 
Power requirements, outdoor thermo-hygro sensor: 
2 AA ( 1.5V) alkaline batteries
If both the base-station ac adapter and the data-link cable are used, the thermo-hygro sensor receives power from the ac adapter via the cable. In this case, batteries can be installed in the sensor to serve as power backup in case of ac failure. 

Data capture and publishing with Weather-Display