when you are remote camping for more than a few days off grid, a small portable weather station can be useful to keep an eye on the weather systems and also can be fun to help you document your experience and what works in various conditions
your smartphone will probably have a barometer built in and GPS altimeter, so you probably don't need these
Stat / max / avg measurement devices
UNI-T UT363 LCD Digital Anemometer Wind Speed Meter Temperature Air Flow Tester
temperature, RH and barometer measurements only occur every 30min on the hour and the half hour
Smartphone Bluetooth devices
HOLDPEAK 866B-APP
Wind Speed Range from 0.3~30m/s (1-100kph) and Temperature
Bluetooth but no USB
takes about 1 hour for temp to equilibrate going from 36degC to 22degC environment
$AU30
Testo 410i Smart Vane Anemometer - IC-0560-1410
although not really designed for campers but rather for industrial uses, the anemometer has the advantage over weather stations of being able to record lower air speeds down to 1.5kph which may be useful if you are assessing air flows inside your tent but max. wind speed is 108kph.
these are small devices which have sensors, an internal battery and data logging system which can be later attached to a computer's USB port to upload the data
USB Air Temperature, Relative Humidity, Dew Point Data Logger, LCD Screen
main temp sensor can take 45min or so to equilibrate to a new ambient temperature while the probe takes about 13 minutes (original temp 22deg indoor, taken to outdoor 11deg)
ext. probe takes around 60secs to equilibrate after immersion into hot water and then around 8 min to return to ambient temperature
battery lasts 2-4yrs depending upon logging frequency 1min vs 4min
$AU138
HoldPeak HP-866A
windspeed 0.8-40m/s (1.4-144kph)
RH, dewpoint, temp, wet bulb temp
takes about 1 hour for temp to equilibrate going from 36degC to 22degC environment
USB
$AU45
other devices
Digital Anemometer Data Logger with WiFi Mobile APP – wind speed, temperature, wind chill