Weather is not a single reading. It is eight separate measurements, each taken by a different kind of instrument, each with its own units, and each with its own rules about where the sensor has to sit. A thermometer needs shade and moving air. A rain gauge needs open sky. An anemometer needs height and a clear run in every direction.
This section groups everything we sell by the element it measures, so you can start from the question you actually have — how cold, how wet, how windy, how humid — rather than from a product category. Every element page below explains how that measurement is properly taken, what good siting looks like, and which instruments do the job.
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Temperature
Air temperature is the most misread measurement in amateur meteorology, because almost everyone puts the sensor in the sun. A correct reading needs shade, free airflow and a height of roughly 1.25 to 2 metres. Our Temperature section covers everything from a £15 indoor station to aspirated professional shields, plus Thermometers, Temperature & Humidity combinations, Temperature Loggers and specialist gauges for fish ponds, animal welfare and pet transport.
Humidity
Relative humidity tells you how close the air is to saturation, expressed as a percentage. It is the measurement that decides whether you get condensation, mould, shrinking timber or static. See Humidity for the full range, Hygrometers for dedicated instruments and Humidity Loggers where you need a recorded history rather than a live display.
Rain
Rainfall is measured in millimetres of depth over a known collecting area, which is why the funnel aperture and the siting matter more than the display. Rain holds every instrument that records precipitation, with Rain Gauges for standalone manual and wireless models, Rain & Temperature for combined units and RainWise for professional tipping-bucket assemblies.
Wind
Wind needs two numbers, speed and direction, and both are extremely sensitive to exposure. The reference standard is 10 metres above open ground. Wind covers fixed anemometers and complete stations, Handheld Anemometers covers pocket meters for spot readings, and Kestrel Wind Meters covers the professional handheld range used in shooting, ballooning, motorsport and fire service work.
Weather Forecast
A forecast from your own instruments comes from barometric pressure and, more precisely, from the rate at which it is changing. Weather Forecast brings together every product that predicts rather than simply records, including the whole Barometer Range, Digital Barometers and dedicated Weather Forecasters.
Air Quality
Indoor air is measured on different scales entirely: carbon dioxide in parts per million, fine particulates in micrograms per cubic metre, and volatile organic compounds as an index. Air Quality Monitors explains what each number means and what to do when it goes the wrong way.
Storm & Lightning
Lightning is detected by listening for the radio burst a strike emits, which allows range and strike rate to be estimated long before you hear thunder. Storm & Lightning covers pressure-based storm warning and strike detection, with Lightning Detectors, Boltek long-range systems and SkyScan personal detectors.
Sunshine
Two different things get called sunshine: solar radiation, measured in watts per square metre, and ultraviolet, reported as the UV index. Growers, solar owners and irrigation planners need the first; almost everyone else wants the second. Both are in Sunshine.
One station, or separate instruments?
If you want several elements at once, an integrated sensor suite is cheaper and easier to site than four separate instruments. Start with Home Weather Stations for domestic use, Professional Weather Stations where the data has to stand up to scrutiny, or Handheld Weather Stations if you need readings in different places rather than one fixed site. If you only care about one element, buying the dedicated instrument almost always gets you better resolution for the money.
Recording, not just reading
A display tells you what is happening now. If you need to prove what happened last Tuesday, you need logging. Data Loggers record to internal memory for later download, and the Davis WeatherLink range streams live data to the web and to your phone. Individual sensors, spares and mounting hardware are in Sensors, Spares & Accessories.
Not sure which element you need?
Call us on 01243 558280. We have been supplying weather instruments to schools, farms, sports grounds, utilities and enthusiasts for years, and it is usually quicker to describe the problem than to work through the specifications. You can also browse the current Best Sellers or the Traditional Weather Instruments range if you are buying a gift rather than solving a measurement problem.