The KRC weather station is located at the Houghton County Airpark, six miles south of Calumet, Michigan USA. We are situated on the Keweenaw Peninsula which juts out from the southern shore of Lake Superior. We are at: 47.17 deg. N latitude, 88.49 deg. W longitude, and an elevation of 1095 feet. See the KRC Map Page at: http://mtukrc.org/map.htm This directory contains raw comma-separated data files from the KRC Weather Station at http://www.mtukrc.org/weather.htm. These files will import directly into Microsoft Excel (tm) for further processing or plotting. Each file contains 24 hours of weather data (midnight-to-midnight). The data is saved with a filename of KRCwthrYYMMDD.csv with the date of the data collection encoded into the filename. Right-click on the desired file in your web browser and the select "Save Target As" to download the file to your computer. The data format is comma-separated values with the first two records a descriptive header and the remaining 1440 records the per-minute weather data for a given day presented in a single record (line). Field Name Units Description ---- ---- ----- ----------------------------------------------- 0 Elapsed Time min. Total elapsed minutes since 0000 1 Time hhmm "Military" time that record was collected 2 AmbAir °F Ambient air temperture @ 2m 3 HI/WC °F Heat Index/Wind Chill Temp 4 RH % Relative Humidity @ 2m 5 Wind10m MPH Wind Speed @ 10m 6 Wind2m MPH Wind Speed @ 2m 7 WindPk MPH Hourly Peak Wind Speed 8 WindDir Deg. Wind Direction @ 10m 9 Baro in Hg Barometric Pressure 10 ShrtWave w/m^2 Shortwave (total hemispherical solar irradiance) 11 ShrtWave Diff. w/m^2 -UNCORRECTED- Diffuse Hemispherical solar irradiance (See note 1n). 12 LngWave w/m^2 Longwave (total hemispherical LW IR) 13 Pmin inch Total liquid precip - last minute 14 PDay inch Total liquid precip = last day 15 PMo inch Total liquid precip = last month 16 PYr inch Total liquid precip = last year 17 SDpth inch Total Snow Depth measured about noon (ultrasonic sensor prior to 5/13/09) 18 RdSurf °F Access Road temp. @ surface of snowpack (or) 19 -0.0ft °F Access Road (plowed/gravel) temp @ road surface 20 -0.5ft °F Access Road temp @ -0.5 ft below ground surf. 21 -1.0ft °F Access Road temp @ -1.0 ft below ground surf. 22 -2.0ft °F Access Road temp @ -2.0 ft below ground surf. 23 -3.0ft °F Access Road temp @ -3.0 ft below ground surf. 24 -4.0ft °F Access Road temp @ -4.0 ft below ground surf. 25 -5.0ft °F Access Road temp @ -5.0 ft below ground surf. 26 -6.0ft °F Access Road temp @ -6.0 ft below ground surf. 27 -7.0ft °F Access Road temp @ -7.0 ft below ground surf. 28 -8.0ft °F Access Road temp @ -8.0 ft below ground surf. 29 0.0ft °F Snowpack temperature @ ground interface 30 0.5ft °F Snowpack temperature @ 0.5ft above ground 31 1.0ft °F Snowpack temperature @ 1.0ft above ground 32 1.5ft °F Snowpack temperature @ 1.5ft above ground 33 2.0ft °F Snowpack temperature @ 2.0ft above ground 34 2.5ft °F Snowpack temperature @ 2.5ft above ground 35 3.0ft °F Snowpack temperature @ 3.0ft above ground 36 Rain °F Rain gauge precipitation temperature probe 37 AirParkRd °F Airpark Blvd Pavement Surface Temp in center of lane (prior to 5/13/09) 38 AirParkRd-3 °F Airpark Blvd Pavement Bottom Temp in center of lane (prior to 5/13/09) 39 AirPkRdTire °F Airpark Blvd Pavement Surface Temp in tire track (prior to 5/13/09) Notes: 1. Channel 11 (Shortwave Diffuse) is measured with an Eppley Shadow Band Stand and an Eppley PSP (Precision Spectral Pyranometer) and has NOT been corrected for band blockage of the sky. Multiply the measured reading by the correction factor from the table below (Note: KRC is located at 47.17 deg N lat., 88.49 deg W long.): -------------------------------------------------------------------------------- Lat Deg N: Jan. Feb. Mar. Apr. May June July Aug. Sept Oct. Nov. Dec. Lat Deg S: July Aug Sept Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June -------------------------------------------------------------------------------- 0 1.17 1.21 1.24 1.22 1.19 1.16 1.17 1.20 1.23 1.21 1.19 1.16 10 1.15 1.19 1.23 1.23 1.20 1.18 1.19 1.21 1.23 1.20 1.16 1.14 20 1.13 1.16 1.21 1.23 1.21 1.19 1.20 1.21 1.22 1.18 1.14 1.12 30 1.11 1.14 1.19 1.22 1.21 1.20 1.21 1.21 1.20 1.15 1.12 1.10 40 1.09 1.12 1.17 1.20 1.21 1.20 1.21 1.21 1.18 1.13 1.10 1.08 50 1.07 1.10 1.14 1.18 1.20 1.20 1.20 1.19 1.15 1.11 1.08 1.06 60 1.05 1.07 1.11 1.15 1.19 1.20 1.19 1.17 1.13 1.09 1.06 1.04 70 ---- 1.05 1.08 1.13 1.18 1.21 1.19 1.14 1.11 1.06 1.04 ---- 80 ---- ---- 1.06 1.11 1.19 1.22 1.20 1.14 1.09 1.04 ---- ---- 90 ---- ---- 1.05 1.11 1.20 1.23 1.21 1.15 1.07 ---- ---- ---- --------------------------------------------------------------------------------- Shortwave diffuse radiation data is generally only available during the non-winter months at KRC. Note 1a: Diffuse data collection stopped for the winter on 11-04-2004. Note 1b: Diffuse data collection restarted for the summer on 05-31-2005. Note 1c: Diffuse data collection stopped for the winter on 11-11-2005. Note 1d: Diffuse data collection restarted for the summer on 04-17-2006. Note 1e: Diffuse data collection stopped for the winter on 10-30-2006. Note 1f: Diffuse data collection restarted for the summer on 04-03-2007. Note 1g: Diffuse data collection stopped for the winter on 11-12-2007. Note 1h: Diffuse data collection restarted for the summer on 04-29-2008. Note 1i: Diffuse data collection stopped for the winter on 11-11-2008. Note 1j: Diffuse data collection restarted for the summer on 05-08-2009. Note 1k: Diffuse data collection stopped for the winter on 11-06-2009. Note 1l: Diffuse data collection restarted for the summer on 03-18-2010. Note 1m: Diffuse data collection stopped for the winter on 11-10-2010. Note 1n: Diffuse Channel is now measuring albedo since 11-10-2010. Note 1o: All Temps and 10m Windspeeds invalid from 0400 on 08-16-2012 to 1500 on 08-29-2012. See "_xtra" files for a given date for backup data from the Davis station. Note 1p: 10m Windspeed and direction invalid from 0090 on 09-05-2012 to xxxx on xx-xx-xxxx. See "_xtra" files for a given date for backup data from the Davis station. 2. Each recorded data point in the file is a simple average of the preceding minutes worth of data collection (except for liquid precipitation which is simply the measured precipitation value at the end of the measurement period). 3. Raw sampling rates on the data vary by parameter. The 10m wind speed is sampled every 200ms to attempt to measure wind peaks. 2m wind speed and wind direction are sampled every 800ms. All other parameters are sampled every 1.6 seconds. 4. Hourly Peak Windspeed is the absolute peak reading from the preceding hour at the 10m anemometer. 5. The ultrasonic snow depth sensor can display false snow depth readings during periods of blowing snow. All rain and snow measurements are taken at the center of a full-size DFIR (Double-Fence Inter-comparison Reference) wind shield to increase the overall "catch" efficiency of the gauges. 6. All temperature measurements are done with Type-T thermocouples (Omega SLE). Air temps are measured inside of an RM Young Gill Multi-Plate Shield to minimize the effects of solar loading. 7. The wind speed and direction sensor at 10m is an RM Young Model 05103 Wind Monitor. The wind speed at 2m is measured with an RM Young/Gill 3-cup anemometer. 8. Rain/Snow fall is measured with a heated-funnel Qualimetrics 6021B tipping-bucket rain gauge. 9. Shortwave direct and diffuse solar radiation are measured with Eppley Labs precision PSP sensors. Longwave (IR) radiation is measured with an Eppley Labs PIR sensor. See http://www.eppleylab.com for more information on these sensors. All data available on this web site (http://blizzard.mtukrc.org/~weather/) is: Copyright © 1998-2009 by Keweenaw Research Center/ Michigan Technological University. All rights are reserved. Please contact the KRC webmaster (webmaster@mtukrc.org) for permission to use this downloadable weather data or for more information.