Weather System

USN Porsgrunn

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Weather Today

Thursday 15th of April 2021 12:56


  Rainfall Today is 0mm | Solar Radiation: 96W/m2


 A bit Cold (7.4°C)   | feels like 2.2°C   | Min: °C | Max: °C


 3. Gentle Breeze (4.0m/s)




Sunrise: 05:09 | Sunset: 19:32


The Weather Station is located in Porsgrunn (Latitude 59.1386° N, Longitude 9.6555° E), Norway at University of South-Eastern Norway (USN) (Google Maps).


The Weather System is developed by Hans-Petter Halvorsen -


Weather Parameters

Below you find a list of Weather Parameters connected to the Weather Station. You may click on the Weather Parameters in order to see a Chart with data for the specific Parameter.

Weather Parameter Tag Name Current Value TimeStamp Historical
Barometric Pressure mtAdjBaromPress 1015.12 hPa 2020-05-18 12:09
Wind Direction mtAdjWindDir 236 ° 2020-05-18 12:09
Rain mtRainToday 0 mm 2020-05-18 12:09
Humidity mtRelHumidity 47 % 2020-05-18 12:09
Solar Radiation mtSolarRadiation 96 W/m2 2020-05-18 12:09
Temperature mtTemp1 7.42 °C 2020-05-18 12:09
Wind Chill mtWindChill 2.21 °C 2020-05-18 12:09
Wind Speed mtWindSpeed 4.02 m/s 2020-05-18 12:09


See Charts for all Weather Parameters in one page (2x4) - or on a Chart Dashboard (4x2)



Below you find miscellaneous Weather Statistics for the Weather Station located at USN (Porsrunn):


Daily Min/Max/Avg Temperature Chart


Daily Rainfall Bar Chart


Daily Solar Radiation Bar Chart


Note! The data logging from the Weather Station started 2019-11-18, so you don't find data and statistics before that date.



Information about the Weather

Below you find some basic information about the different Weather Parameters that are measured and logged by this Wetaher System.

You also find lots of Weather Information at



A temperature expresses hot and cold, as measured with a thermometer.

There are various temperature scales. The most commonly used scales are the Celsius scale (denoted °C), Fahrenheit scale (denoted °F), and Kelvin scale (denoted K).


Icon Temperature °C Description Season
> 30 °C Very Hot Summer
20 to 30 °C Hot Summer
10 to 20 °C Warm Spring/Summer
0 to 10 °C A bit Cold Autumn
-10 to 0 °C Cold Winter
-20 to -30 °C Very Cold Winter
< -30 °C Extremly Cold Winter




Rain is liquid water in the form of droplets that have condensed from atmospheric water vapor and then become heavy enough to fall under gravity.


Wind Direction

The Wind Direction is reported by the direction from which it originates. For example, a northerly wind blows from the north to the south. The wind directions are measured in units from 0° to 360°. Wind direction is measured in degrees clockwise from due north. A wind blowing from the north has a wind direction of 0° (360°), a wind blowing from the east has a wind direction of 90°, a wind blowing from the south has a wind direction of 180°, and a wind blowing from the west has a wind direction of 270°. See details below.


See detailed table below.


Wind Direction Icon Degrees [°] Direction
0 Wind from North
1 45° Wind from North-East
2 90° Wind from East
3 135° Wind from South-East
4 180° Wind from South
5 225° Wind from South-West
6 270° Wind from West
7 315° Wind from North-West



Wind Speed

The Beaufort wind scale is an empirical measure that relates wind speed to observed conditions at sea or on land. Se details below.


Wind Scale Icon Description Norwegian Wind Speed m/s Effect
0 Calm Stille <0.3 m/s Nothing
1 Light Air Flau vind 0.3 - 1.5 m/s Diversion of smoke
2 Light Breeze Svak vind 1.6 - 3.3 m/s Contractions of leaves
3 Gentle Breeze Lett bris 3.4 - 5.4 m/s Movement of branches
4 Moderate Breeze laber bris 5.5 -7.9 m/s Movement of limbs
5 Fresh Breeze Frisk bris 8.0 - 10.7 m/s Movement of small trees
6 Strong Breeze Liten kuling 10.8 - 13.8 m/s Movement strong branches
7 High Wind Stiv kuling 13.9 - 17.1 m/s Movement of trees
8 Gale Sterk kuling 17.2 - 20.7 m/s Difficulty in walking
9 String Gale Liten storm 20.8 - 24.4 m/s House damage
10 Storm Full storm 24. 5 - 28.4 m/s Uprooting of trees
11 Violent Storm Sterk storm 28.5 - 32.6 m/s Storm damage
12 Hurricane Orkan > 32.7 m/s Devastation

Reference: and

The Beaufort wind scale is the most popular scale to name and rate winds by the wind speed. The scale is named after Sir Francis Beaufort. If a wind strength is given without an addendum, the Beaufort scale is used. In the weather forecast and journals this scale is used.



Humidity is the concentration of water vapour present in air. Humidity can be measured in several ways, but relative humidity (RH) is the most common.

Humidity can indicate how likely is it that there will be dew, fog or precipitation/rain.

When Relative humidity is close to 100%, it indicates that there’s a strong possibility of rain.

Absolute humidity is the mass of water vapor divided by the mass of dry air in a volume of air at a given temperature. The hotter the air is, the more water it can contain. Absolute humidity is expressed as grams of moisture per cubic meter of air (g/m3).

Relative humidity is the ratio of the current absolute humidity to the highest possible absolute humidity (which depends on the current air temperature).

A reading of 100 percent relative humidity means that the air is totally saturated with water vapor and cannot hold any more, creating the possibility of rain. This doesn't mean that the relative humidity must be 100 percent in order for it to rain — it must be 100 percent where the clouds are forming, but the relative humidity near the ground could be much less.

Humans are very sensitive to humidity, as the skin relies on the air to get rid of moisture. The process of sweating is your body's attempt to keep cool and maintain its current temperature. If the air is at 100 percent relative humidity, sweat will not evaporate into the air. As a result, we feel much hotter than the actual temperature when the relative humidity is high.

If the relative humidity is low, we can feel much cooler than the actual temperature because our sweat evaporates easily, cooling us off.


What Is Relative Humidity and How Does it Affect How I Feel Outside?


Barometric Pressure

Atmospheric pressure, sometimes also called barometric pressure (after the sensor), is the pressure within the atmosphere of Earth.

The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa; 1,013.25 mbar), equivalent to 760 mm Hg. The atm unit is roughly equivalent to the mean sea-level atmospheric pressure on Earth, that is, the Earth's atmospheric pressure at sea level is approximately 1 atm.

The mean sea-level pressure (MSLP) is the average atmospheric pressure at mean sea level. This is the atmospheric pressure normally given in weather reports on radio, television, and newspapers or on the Internet. When barometers in the home are set to match the local weather reports, they measure pressure adjusted to sea level, not the actual local atmospheric pressure.

Average sea-level pressure is 1013.25 hPa.

How Does Air Pressure Affect Weather?


Solar Radiation

Solar irradiance (SI) is the power per unit area (watt per square metre, W/m2), received from the Sun in the form of electromagnetic radiation as reported in the wavelength range of the measuring instrument. Solar irradiance is often integrated over a given time period in order to report the radiant energy emitted into the surrounding environment (joule per square metre, J/m2), during that time period. This integrated solar irradiance is called solar irradiation, solar exposure, solar insolation, or insolation.




Information about the Weather System

This Weather Station is located at University of South-Eastern Norway, campus Porsgrunn.

The Weather System is based on a Capricorn 2000ex Weather Station with Weather MicroServer from Columbia Weather Systems.


Below we see an overview of the Weather System at University of South-Eastern Norway, campus Porsgrunn. The Weather System is Developed by Hans-Petter Halvorsen -


The Data from the Weather Station are then saved in different places:


The Data are logged every 10 minutes, meaning we get 144 meeasurments every day (between 00:00 and 24:00).


This Web Application is programmed by using PHP, HTML5, Bootstrap, JavaScript and data are stored in a MariaDB Database.


The Data Logging Application is written in LabVIEW. See Figure below. The Data are retrieved from the Weather Station using Modbus TCP and XML Web Service. The data are then stored in the cloud in different ways (SQL Server, MariaDB/MySQL, OPC UA, etc.) and at different locations, such as Microsoft Azure, ThingSpeak, etc.



The data from the Weather Station are also stored on ThingSpeak. ThingSpeak is an IoT Service that lets you collect and store sensor data in the cloud and develop Internet of Things applications.

Weather Station at ThingSpeak


Microsft Azure

The data from the Weather Station are also stored in Microsoft Azure. Microsoft Azure is a Cloud Platform from Micrsoft.

Weather Station at Microsoft Azure


Data Management System (DMS)

The Weather System is part of a larger platform for Data Logging, Data Management and Data Monitoring; Data Management System (DMS).

Below you see an overview of the Data Management System.



The DMS platform offers infrastructure, database, applications for management and monitoring, datalogging features and different APIs for saving and retrieving data.


Data Management and Monitoring Web Application:


Tag Management:


For more information, see the following:

Data Management System Project



The Data Management System (DMS) is Developed by Hans-Petter Halvorsen -

Questions and Answers (Q&A)

In this Forum everybody can ask Questions, answer Questions, Comment, give Tips and Tricks, etc. regarding the Weather System. Please use Full Name and Picture.