Definition
Weather Station (Weather Station, collection of elements such as temperature, light, water, and air) is an observational device that automatically collects meteorological elements such as temperature, humidity, air pressure, wind speed, wind direction, precipitation, sunlight, and evaporation. According to configuration, it can be divided into four-element, six-element, seven-element, etc. The data is uploaded in real-time to the meteorological cloud platform via IoT SIM cards or wired networks and is used for industry applications such as weather forecasting, disaster warning, agricultural decision-making, and load prediction.
Weather stations need to comply with meteorological industry standards, with clear requirements for sensor accuracy, collection frequency, and data format. Observation stations are often deployed in the wild, mountains, islands, etc. IoT SIM cards are suitable for scenarios without wired networks or for mobile deployments.
Technical Features
Weather stations use various types of sensors (platinum resistance, capacitive humidity, air pressure, anemometer, rain gauge, sunshine recorder, evaporation pan, etc.). Data is summarized by a collector and uploaded in a unified format. The collection frequency is usually 1 minute to 1 hour. They form a three-dimensional observation network together with sounding devices, radar, and satellites. IoT SIM cards must ensure continuous and reliable data transmission to avoid missing or delayed reports.
Use Cases
Weather stations are widely used in smart agriculture, traffic meteorology, new energy power generation, weather modification, airports, ports, and other scenarios. Agricultural weather stations provide evaporation and rainfall data for precise irrigation; traffic weather stations provide visibility and road surface temperature monitoring for highways. SimtoLink provides stable, widely covered networking services and dedicated APN for meteorological observation equipment.
Elements, cadence, and missing values in an observation message
An automatic weather station means a checkable observation produced on an agreed cadence, not "a sensor is uploading." An observation should name the station id, the observation time, each element's value, unit, and quality flag. Whether temperature, humidity, pressure, wind, precipitation, and light are all in this message depends on how that station is fitted. A missing element should be marked not installed or missing for this hour. Omitting the field lets the platform carry forward the previous hour. The IoT SIM sends a message that has already been formed. A broken link does not change an observation the station has already made. A backfill has to carry the original observation time. The platform files by observation time. Filing by arrival time records a late report as a new hour.
Cadence commonly runs from one minute to one hour. The use of the data decides it, not the SIM's online heartbeat. Precipitation is a total over the period. Wind can be a period average plus a maximum. Temperature is often an on-the-hour instant or a period average. Calling all of these the current value and storing them in one column makes irrigation and load estimates use the wrong quantity. A quality flag should at least separate normal, suspect, missing, and manually corrected. Zero and missing are not the same. No rain can be zero millimeters. A sensor that did not answer cannot be written as zero millimeters. Six elements only names a common combination. The sample height and the instrument model of a given station still have to be kept with the station metadata.
Power, time sync, and backfill at a field station
Field, mountain, and island stations use cellular because there is often no fixed line. Stable observations need power that lasts through a run of rain or cold, a clock already aligned before the cadence boundary, and a logger that stores each message by observation time while the network is down. When solar is short, keep the on-the-hour observation and the storage first, and consider more frequent upload after that. If the module reboots at low battery and clears the cache, the platform after the network returns sees only the hours after recovery, and the day in between is marked missing. The time source can be satellite time or the network, but the observation time should follow the station clock. Network delay must not rewrite a timestamp already applied.
The antenna has to extend outside the enclosure and the security cage. Metal in the enclosure itself lets the module look occasionally attached while the on-the-hour message often fails. Backfill after a failure needs an order and a limit, so one recovery does not push several days of messages at once and crowd out the current hour. Unlike a moving observation such as a radiosonde, a surface station's position should stay fixed. A change of site has to update the metadata. The platform should not simply adopt a drifting fix. When agriculture uses precipitation and evaporation to schedule irrigation, it uses a total over a period. If a late backfill is dropped, that day's decision misses rain that already fell.
The online lamp is lit, and the elements are already wrong
A blocked rain-gauge funnel, a frozen wind cup, or dust on a radiation-sensor dome leaves the logger and the SIM normal, and the message still arrives on time. Values stay unchanged for a long time, or precipitation sits at zero while a neighboring station already has rain. Watching only "a message arrived today" does not catch this. Check whether an element is outside its physical range, whether an unreasonable jump appeared, and whether humidity and temperature still imply a plausible dew point. A non-zero wind speed that stays constant for a long time, or a temperature whose daily cycle disappears, deserves maintenance rather than continued use downstream.
Another error is units and the missing-value code. The station uses Celsius and the platform parses Fahrenheit. The numbers are still "online" and cannot be used. A missing value coded as a large negative is drawn as an extreme low. After a sensor is replaced, if the calibration record is not updated, the old correction is applied to the new instrument. If SIM data volume is filled by photos or a remote-desktop session, the short on-the-hour message cannot get out. Maintenance staff can still see the desktop remotely and think the observation is continuing. Observation messages and remote maintenance should be separate, or at least the on-the-hour data should leave the station first.