70.6 °F

About ShenPWS


Clifton Park: United States

Local Date/Time:

Server Uptime: 2 days, 2 hours, 8 minutes
WeeWX Uptime: 2 days, 2 hours, 8 minutes

Sensor Battery Sky: 3.220000
Sensor Battery Air: 2.644600

ShenPWS website provides weather observations from Clifton Park NY, near Shenendehowa Central Schools, from an WeatherFlow Smart Home Weather Station updated in real time.
Note: this is a hobby PWS - no guarantees.

WeatherFlow Smart Home Weather station provides the following readings (derived to further weather variables) [notes]:

  • Temperature
  • Humidity
  • Barometric Pressure
  • Wind speed/direction
  • Rainfall
  • Illuminance
  • UV
  • Lightning count/distance

ShenPWS also post data to the following services:

ShenPWS Hardware:

ShenPWS Software & External Apps:

WeeWX Support:

Extra WX/Astronomy Links:

Credits & Thanks:

ShenPWS Notes & Weather References:

  • WeeWX Derived Weather Variables - WeeWX, formulas and utilities
  • WF Derived Weather Variables - WeatherFlow, derived weather variables
  • DI Derived Weather Variables (PDF) - Davis Instruments, derived weather variables
  • ShenPWS note - Solar Radiation vs Illuminance: Solar Radiation (aka, Insolation) is the incident solar radiation and it is measures in "Watt/m^2" (W/m²) while Illuminance, measured in "Lux" (lx), is the incident lumens per m^2. The lux is incident solar radiation scaled by the spectral response of the eye of the human being. The human eye responses only to a specific range of wavelengths of the electromagnetic radiation called Light (which is only a small portion of the solar radiation). The solar cells and photo detector has naturally a different spectral response from the human eye. Radiometric is used with such detectors and converters of the solar radiation. Although, extrapolation by a multiplier provides close results (as used by WeatherFlow, ShenPWS considers Lux = 120.0*Rad ratio - some literature, as references underneath, considers 119.0; WeeWX calculates local Theoretical maxSolarRad from "PyEphem", and Graphs-subroutine extrapolates to maxIlluminance based on ratio).
  • ShenPWS note - WeatherFlow Radiation/UV/Illuminance sensors: WeatherFlow Smart Home Weather Station has two light sensors (not 3), each tuned to a different section of the light spectrum as to measure sunlight (Broadcom APDS-9200). Those sensors reports “Lux” (aka, "Illuminance") and “UV index” directly, and estimate Solar Radiation from the illuminance value.
  • ShenPWS note - EvapoTranspiration (ET): ET is defined as the amount of evaporation that would occur if a sufficient water source were available. That is, EvapoTranspiration is considered the net result of atmospheric demand for moisture from a surface and the ability of the surface to supply moisture. Surface, air temperatures, insolation, humidity and wind all affect ET. A dryland is a place where annual potential evaporation exceeds annual precipitation (ie, ET is "an inverse" of rain).
    • ET Calculation - Step by Step Calculation of the Penman-Monteith Evapotranspiration; Lincoln Zotarelli et others, University of Florida [2018]
    • Crop EvapoTranspiration - Guidelines for computing crop water requirements - FAO Irrigation and drainage; FAO - Food and Agriculture Organization of the United Nations [1998]