Data Variables

Data Variables

Descriptions of data variables in the AZMet database
Variable Name Description Units System Type Dependencies
actual vapor pressure vp_actual value in kilopascals at date and time of measurement kPa SI derived relative_humidity, temp_airC
air temperature temp_airC value in degrees Celsius at 1.5 meters height at date and time of measurement °C SI measured NA
air temperature temp_air_30cmC value in degrees Celsius at 0.3 meters height at date and time of measurement °C SI measured NA
air temperature temp_air_maxC maximum value in degrees Celsius at 1.5 meters height since midnight local time °C SI measured NA
air temperature temp_air_minC minimum value in degrees Celsius at 1.5 meters height since midnight local time °C SI measured NA
battery voltage meta_bat_volt value in volts at date and time of measurement V SI measured NA
data quality flag meta_needs_review metadata NA NA NA NA
data version meta_version metadata NA NA NA NA
date and time of measurement datetime year-month-day and hour:minute:second NA NA NA NA
day of year of measurement date_doy sequential day number starting with 1 on January 1 NA NA NA NA
dew point temperature dwpt value in degrees Celsius at 1.5 meters height at date and time of measurement °C SI derived relative_humidity, temp_airC
dew point temperature dwpt_30cm value in degrees Celsius at 0.3 meters height at date and time of measurement °C SI derived relative_humidity_30cm, temp_air_30cmC
dielectric constant lw1_mv value from leaf wetness sensor 1 in millivolts at 0.3 meters height at date and time of measurement mV SI measured NA
dielectric constant lw2_mv value from leaf wetness sensor 2 in millivolts at 0.3 meters height at date and time of measurement mV SI measured NA
hour of measurement date_hour 24-hour day time NA NA NA NA
panel temperature temp_panelC value of data logger panel in degrees Celsius at date and time of measurement °C SI measured NA
precipitation precip_total_mm value in millimeters since midnight local time at date and time of measurement mm SI measured NA
relative humidity relative_humidity value in percent at 1.5 meters height at date and time of measurement % NA measured NA
relative humidity relative_humidity_30cm value in percent at 0.3 meters height at date and time of measurement % NA measured NA
saturation vapor pressure vp_saturation value in kilopascals at date and time of measurement kPa SI derived temp_airC
second of measurement date_seconds 60-second minute time NA NA NA NA
soil temperature temp_soil_10cmC value in degrees Celsius at 10 centimeters depth at date and time of measurement °C SI measured NA
soil temperature temp_soil_50cmC value in degrees Celsius at 50 centimeters depth at date and time of measurement °C SI measured NA
solar radiation sol_rad_kWm2 value in kilowatts per square meter at date and time of measurement kW/m^2 SI measured NA
solar radiation sol_rad_total value in megajoules per square meter at date and time of measurement MJ/m^2 SI measured NA
station identifier meta_station_id metadata NA NA NA NA
station name meta_station_name metadata NA NA NA NA
time of dielectric constant above 283 mV lw1_total_wet_mins value from leaf wetness sensor 1 in minutes at date and time of measurement min NA measured NA
time of dielectric constant above 283 mV lw2_total_wet_mins value from leaf wetness sensor 2 in minutes at date and time of measurement min NA measured NA
time of dielectric constant below 274 mV lw1_total_dry_mins value from leaf wetness sensor 1 in minutes at date and time of measurement min NA measured NA
time of dielectric constant below 274 mV lw2_total_dry_mins value from leaf wetness sensor 2 in minutes at date and time of measurement min NA measured NA
time of dielectric constant between 274 and 283 mV lw1_total_con_mins value from leaf wetness sensor 1 in minutes at date and time of measurement min NA measured NA
time of dielectric constant between 274 and 283 mV lw2_total_con_mins value from leaf wetness sensor 2 in minutes at date and time of measurement min NA measured NA
two-minute sustained wind speed wind_2min_spd_max_mps_daily maximum value in meters per second since midnight local time m/s SI measured NA
two-minute sustained wind speed wind_2min_spd_max_mps_daily maximum value in meters per second since top of the hour m/s SI measured NA
two-minute sustained wind speed wind_2min_spd_mean_mps value in meters per second at date and time of measurement m/s SI measured NA
vapor pressure deficit vp_deficit value in kilopascals at date and time of measurement kPa SI derived relative_humidity, temp_airC
wet-bulb temperature temp_wetbulbC value in degrees Celsius at 1.5 meters height at date and time of measurement °C SI derived relative_humidity, temp_airC
wind speed wind_spd_max_mps maximum value in meters per second since midnight local time m/s SI measured NA
wind speed wind_spd_mps value in meters per second at date and time of measurement m/s SI measured NA
wind vector direction wind_vector_dir value in degrees at date and time of measurement deg non-SI measured NA
wind vector direction of two-minute sustained wind speed wind_2min_vector_dir value in degrees at date and time of measurement deg non-SI measured NA
wind vector direction of two-minute sustained wind speed wind_2min_vector_dir_max_daily value in degrees since midnight local time at date and time of measurement deg non-SI measured NA
wind vector direction of two-minute sustained wind speed wind_2min_vector_dir_max_hourly value in degrees since top of the hour at date and time of measurement deg non-SI measured NA
year of measurement date_year calendar year starting January 1 NA NA NA NA
Variable Name Description Units System Type Dependencies
actual vapor pressure vp_actual hourly average in kilopascals kPa SI derived relative_humidity, temp_airC
air temperature temp_airC hourly average in degrees Celsius °C SI measured NA
air temperature temp_airF hourly average in degrees Fahrenheit °F non-SI derived temp_airC
battery voltage meta_bat_volt hourly average in volts V SI measured NA
cotton heat stress heatstress_cottonC hourly average of canopy temperature in degrees Celsius °C SI derived relative_humidity, sol_rad_total, temp_airC, vp_deficit
cotton heat stress heatstress_cottonF hourly average of canopy temperature in degrees Fahrenheit °F non-SI derived heatstress_cottonC
data quality flag meta_needs_review metadata NA NA NA NA
data version meta_version metadata NA NA NA NA
date and time of maximum two-minute sustained wind speed wind_2min_timestamp year-month-day and hour:minute:second NA NA NA NA
date and time of measurement date_datetime year-month-day and hour NA NA NA NA
day of year of measurement date_doy sequential day number starting with 1 on January 1 NA NA NA NA
dew point temperature dwpt hourly average in degrees Celsius °C SI derived vp_actual
dew point temperature dwptF hourly average in degrees Fahrenheit °F non-SI derived dwpt
hour of measurement date_hour 24-hour day time NA NA NA NA
precipitation precip_total hourly total in millimeters mm SI measured NA
precipitation precip_total_in hourly total in inches in non-SI derived precip_total
reference evapotranspiration eto_azmet hourly total in millimeters based on AZMet equation mm SI derived sol_rad_total, temp_airC, vp_deficit, wind_spd_mps
reference evapotranspiration eto_azmet_in hourly total in inches based on AZMet equation in non-SI derived eto_azmet
relative humidty relative_humidity hourly average in percent % NA measured NA
soil temperature at 10 centimeters temp_soil_10cmC hourly sample in degrees Celsius at 10 centimeters depth °C SI measured NA
soil temperature at 10 centimeters temp_soil_10cmF hourly sample in degrees Fahrenheit at 10 centimeters depth °F non-SI derived temp_soil_10cmC
soil temperature at 50 centimeters temp_soil_50cmC hourly sample in degrees Celsius at 50 centimeters depth °C SI measured NA
soil temperature at 50 centimeters temp_soil_50cmF hourly sample in degrees Fahrenheit at 50 centimeters depth °F non-SI derived temp_soil_50cmC
solar radiation sol_rad_total hourly total in megajoules per square meter MJ/m^2 SI measured NA
solar radiation sol_rad_total_ly hourly total in langleys ly non-SI derived sol_rad_total
station identifier meta_station_id metadata NA NA NA NA
station name meta_station_name metadata NA NA NA NA
two-minute sustained wind speed wind_2min_spd_max_mph hourly maximum in miles per hour mi/h non-SI derived wind_2min_spd_max_mps
two-minute sustained wind speed wind_2min_spd_max_mps hourly maximum in meters per second m/s SI measured NA
two-minute sustained wind speed wind_2min_spd_mean_mph hourly average in miles per hour mi/h non-SI derived wind_2min_spd_mean_mps
two-minute sustained wind speed wind_2min_spd_mean_mps hourly average in meters per second m/s SI measured NA
vapor pressure deficit vp_deficit hourly average in kilopascals kPa SI measured NA
wind speed wind_spd_max_mph hourly maximum in miles per hour mi/h non-SI derived wind_spd_max_mps
wind speed wind_spd_max_mps hourly maximum in meters per second m/s SI measured NA
wind speed wind_spd_mph hourly average in miles per hour mi/h non-SI derived wind_spd_mps
wind speed wind_spd_mps hourly average in meters per second m/s SI measured NA
wind vector direction wind_vector_dir hourly average in degrees deg non-SI measured NA
wind vector direction wind_vector_dir_stand_dev hourly standard deviation in degrees deg non-SI measured NA
wind vector direction of maximum two-minute sustained wind speed wind_2min_vector_dir in degrees deg non-SI measured NA
wind vector magnitude wind_vector_magnitude hourly average in meters per second m/s SI measured NA
wind vector magnitude wind_vector_magnitude_mph hourly average in miles per hour mi/h non-SI derived wind_vector_magnitude
year of measurement date_year calendar year starting January 1 NA NA NA NA
Variable Name Description Units System Type Dependencies
actual vapor pressure vp_actual_max daily maximum in kilopascals kPa SI derived relative_humidity, temp_airC
actual vapor pressure vp_actual_mean daily average in kilopascals kPa SI derived relative_humidity, temp_airC
actual vapor pressure vp_actual_min daily minimum in kilopascals kPa SI derived relative_humidity, temp_airC
air temperature temp_air_maxC daily maximum in degrees Celsius °C SI measured NA
air temperature temp_air_maxF daily maximum in degrees Fahrenheit °F non-SI derived temp_air_maxC
air temperature temp_air_meanC daily average in degrees Celsius °C SI measured NA
air temperature temp_air_meanF daily average in degrees Fahrenheit °F non-SI derived temp_air_meanC
air temperature temp_air_minC daily minimum in degrees Celsius °C SI measured NA
air temperature temp_air_minF daily minimum in degrees Fahrenheit °F non-SI derived temp_air_minC
battery voltage meta_bat_volt_max daily maximum in volts V SI measured NA
battery voltage meta_bat_volt_mean daily average in volts V SI measured NA
battery voltage meta_bat_volt_min daily minimum in volts V SI measured NA
chill hours 0 °C* chill_hours_0C daily sum of hours below 0.0 degrees Celsius h NA derived temp_airC
chill hours 20 °C* chill_hours_20C daily sum of hours above 20.0 degrees Celsius h NA derived temp_airC
chill hours 32 °F chill_hours_32F daily sum of hours below 32.0 degrees Fahrenheit h NA derived chill_hours_0C
chill hours 45 °F chill_hours_45F daily sum of hours below 45.0 degrees Fahrenheit h NA derived chill_hours_7C
chill hours 68 °F chill_hours_68F daily sum of hours above 68.0 degrees Fahrenheit h NA derived chill_hours_20C
chill hours 7 °C* chill_hours_7C daily sum of hours below 7.2 degrees Celsius h NA derived temp_airC
cotton heat stress* heatstress_cotton_meanC daily average of canopy temperature in degrees Celsius °C SI derived relative_humidity, sol_rad_total, temp_airC, vp_deficit
cotton heat stress heatstress_cotton_meanF daily average of canopy temperature in degrees Fahrenheit °F non-SI derived heatstress_cotton_meanC
data quality flag meta_needs_review metadata NA NA NA NA
data version meta_version metadata NA NA NA NA
date and time of maximum two-minute sustained wind speed wind_2min_timestamp year-month-day and hour:minute:second NA NA NA NA
date of measurement datetime year-month-day NA NA NA NA
day of year of measurement date_doy sequential day number starting with 1 on January 1 NA NA NA NA
dew point temperature dwpt_mean daily average in degrees Celsius °C SI derived vp_actual_mean
dew point temperature dwpt_meanF daily average in degrees Fahrenheit °F non-SI derived dwpt_mean
heat units 30-10 °C heat_units_10C daily total with upper and lower thresholds of 30.0 and 10.0 degrees Celsius degree-days in °C NA derived temp_air_maxC, temp_air_minC
heat units 30-13 °C heat_units_13C daily total with upper and lower thresholds of 30.0 and 12.8 degrees Celsius degree-days in °C NA derived temp_air_maxC, temp_air_minC
heat units 30-7 °C heat_units_7C daily total with upper and lower thresholds of 30.0 and 7.2 degrees Celsius degree-days in °C NA derived temp_air_maxC, temp_air_minC
heat units 34-13 °C heat_units_3413 daily total with upper and lower thresholds of 34.4 and 12.8 degrees Celsius degree-days in °C NA derived temp_air_maxC, temp_air_minC
heat units 86-45 °F heat_units_45F daily total with upper and lower thresholds of 86.0 and 45.0 degrees Fahrenheit degree-days in °F NA derived heat_units_7C
heat units 86-50 °F heat_units_50F daily total with upper and lower thresholds of 86.0 and 50.0 degrees Fahrenheit degree-days in °F NA derived heat_units_10C
heat units 86-55 °F heat_units_55F daily total with upper and lower thresholds of 86.0 and 55.0 degrees Fahrenheit degree-days in °F NA derived heat_units_13C
heat units 94-55 °F heat_units_9455F daily total with upper and lower thresholds of 94.0 and 55.0 degrees Fahrenheit degree-days in °F NA derived heat_units_3413
precipitation precip_total_in daily total in inches in non-SI derived precip_total_mm
precipitation precip_total_mm daily total in millimeters mm SI measured NA
reference evapotranspiration* eto_azmet daily total in millimeters based on AZMet equation mm SI derived sol_rad_total, temp_airC, vp_deficit, wind_spd_mps
reference evapotranspiration eto_azmet_in daily total in inches based on AZMet equation in non-SI derived eto_azmet
reference evapotranspiration eto_pen_mon daily total in millimeters based on Penman-Monteith equation mm SI derived date_doy, sol_rad_total, temp_air_maxC, temp_air_minC, vp_actual_mean, wind_spd_mean_mps
reference evapotranspiration eto_pen_mon_in daily total in inches based on Penman-Monteith equation in non-SI derived eto_pen_mon
relative humidity relative_humidity_max daily maximum in percent % NA measured NA
relative humidity relative_humidity_mean daily average in percent % NA measured NA
relative humidity relative_humidity_min daily minimum in percent % NA measured NA
soil temperature at 10 centimeters temp_soil_10cm_maxC daily maximum in degrees Celsius at 10 centimeters depth °C SI measured NA
soil temperature at 10 centimeters temp_soil_10cm_maxF daily maximum in degrees Fahrenheit at 10 centimeters depth °F non-SI derived temp_soil_10cm_maxC
soil temperature at 10 centimeters temp_soil_10cm_meanC daily average in degrees Celsius at 10 centimeters depth °C SI measured NA
soil temperature at 10 centimeters temp_soil_10cm_meanF daily average in degrees Fahrenheit at 10 centimeters depth °F non-SI derived temp_soil_10cm_meanC
soil temperature at 10 centimeters temp_soil_10cm_minC daily minimum in degrees Celsius at 10 centimeters depth °C SI measured NA
soil temperature at 10 centimeters temp_soil_10cm_minF daily minimum in degrees Fahrenheit at 10 centimeters depth °F non-SI derived temp_soil_10cm_minC
soil temperature at 50 centimeters temp_soil_50cm_maxC daily maximum in degrees Celsius at 50 centimeters depth °C SI measured NA
soil temperature at 50 centimeters temp_soil_50cm_maxF daily maximum in degrees Fahrenheit at 50 centimeters depth °F non-SI derived temp_soil_50cm_maxC
soil temperature at 50 centimeters temp_soil_50cm_meanC daily average in degrees Celsius at 50 centimeters depth °C SI measured NA
soil temperature at 50 centimeters temp_soil_50cm_meanF daily average in degrees Fahrenheit at 50 centimeters depth °F non-SI derived temp_soil_50cm_meanC
soil temperature at 50 centimeters temp_soil_50cm_minC daily minimum in degrees Celsius at 50 centimeters depth °C SI measured NA
soil temperature at 50 centimeters temp_soil_50cm_minF daily minimum in degrees Fahrenheit at 50 centimeters depth °F non-SI derived temp_soil_50cm_minC
solar radiation sol_rad_total daily total in megajoules per square meter MJ/m^2 SI measured NA
solar radiation sol_rad_total_ly daily total in langleys ly non-SI derived sol_rad_total
station identifier meta_station_id metadata NA NA NA NA
station name meta_station_name metadata NA NA NA NA
two-minute sustained wind speed wind_2min_spd_max_mph daily maximum in miles per hour mi/h non-SI derived wind_2min_spd_max_mps
two-minute sustained wind speed wind_2min_spd_max_mps daily maximum in meters per second m/s SI measured NA
two-minute sustained wind speed wind_2min_spd_mean_mph daily average in miles per hour mi/h non-SI derived wind_2min_spd_mean_mps
two-minute sustained wind speed wind_2min_spd_mean_mps daily average in meters per second m/s SI measured NA
vapor pressure deficit vp_deficit_mean daily average in kilopascals kPa SI derived relative_humidity, temp_airC
wind speed wind_spd_max_mph daily maximum in miles per hour mi/h non-SI derived wind_spd_max_mps
wind speed wind_spd_max_mps daily maximum in meters per second m/s SI measured NA
wind speed wind_spd_mean_mph daily average in miles per hour mi/h non-SI derived wind_spd_mean_mps
wind speed wind_spd_mean_mps daily average in meters per second m/s SI measured NA
wind vector direction wind_vector_dir daily average in degrees deg non-SI measured NA
wind vector direction wind_vector_dir_stand_dev daily standard deviation in degrees deg non-SI measured NA
wind vector direction of maximum two-minute sustained wind wind_2min_vector_dir in degrees deg non-SI measured NA
wind vector magnitude wind_vector_magnitude daily average in meters per second m/s SI measured NA
wind vector magnitude wind_vector_magnitude_mph daily average in miles per hour mi/h non-SI derived wind_vector_magnitude
year of measurement date_year calendar year starting January 1 NA NA NA NA

Scroll vertically over the table to view additional rows and horizontally on narrow displays to view additional columns. Hourly and daily data are based on measurements every 10 seconds. Measurements of two-minute sustained wind-, vapor pressure-, and wind vector magnitude-related variables are based on calculations in the station datalogger program. Dependencies of daily variables with an asterisk are hourly variables. Measurement of snow and other forms of frozen precipitation occurs as it melts. Data for 15-minute, hourly, and daily variables are available through corresponding API endpoints and related tools.