Maps of the 1981–2010 average number of January days with (a) measurable precipitation (PRCP = 0.01 in. Differences are shown in inches, and positive differences indicate that the average is greater than the median. Map of differences between the climatological average and median monthly precipitation totals for January during 1981–2010. 3, but for July average precipitation totals. Maps of 1981–2010 January average totals of (a) precipitation (in.) and (b) snowfall (in.) across the contiguous 48 states, Alaska, Hawaii, Puerto Rico, the Virgin Islands, and various islands in the central and western Pacific (including American Samoa, Guam, Johnston Atoll, Marshall Islands, Northern Mariana Islands, Federated States of Micronesia, Midway Islands, Palau, and Wake Island).Īs in Fig. For details on these methods, see section 3a. The symbols identify the locations of the stations, and their shapes indicate how the average monthly total was computed: from a complete record of 30 observed July totals between 19 (circles), from a combination of observed and estimated July totals (squares), or using the quasi-normals approach (triangles). Numbers indicate the average precipitation totals in inches. Climate Normals.Īverage July precipitation totals during 1981–2010 for stations with varying degrees of data completeness in two distinct regions: (a) Champaign 9 SW (GHCN-Daily station USW00054808 40.0528°N, 88.3728°W) and its 10 nearest neighbors with average monthly PRCP totals and (b) all stations within 100 km of Zuni (USW00093044 35.0706°N, 108.8389°W). Users assume responsibility to determine the usability of these data.Locations of (a) the 9307 stations with average monthly precipitation totals and (b) the 5279 stations with the full range of precipitation, snowfall, and snow-depth statistics in the 1981–2010 U.S. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.", "Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. ", "Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA National Centers for Environmental Information. ĭataset landing page with general information and access links for the dataset. Data and ResourcesĬooperative Observer Program (COOP) Hourly. These data are formatted consistent with practices for NCEI Global In-situ datasets. This updated HPD includes the historical data from the punch paper era and the recent digital era in order to provide the full period of record for each location. The WFO subsequently combines all data into a single tar file and transfers the data to NCEI via ftp upload nominally each month. Monthly site visits to each station are still performed, but instead of collecting punched paper (that would subsequently need conversion to a digital record via a MITRON reader), data are downloaded from the station's datalogger to a memory stick and centrally collected at the local Weather Forecast Office (WFO) for all stations in the WFO area. Data and metadata are ingested on a daily basis and combined in a single integrated dataset.Īs with the legacy punch paper instrumentation, the electronic loggers record rain gauge depth every 15 minutes. Hourly precipitation totals are then computed from the 15-min data and are quality controlled by a suite of automated algorithms that combine checks on the daily and hourly time scale. The 15-min gauge depth time series are processed at NCEI via automated quality control and filtering algorithms to identify and remove spurious observations from noise and malfunctioning equipment, and also those due to natural phenomena such as evaporation and the necessary occasional emptying of the gauge. These stations, nearly all of which were part of HPD version 1, also known as DSI-3240, were gradually upgraded from paper punch tape data recording systems to a more modern electronic data logger system from 2004-2013. ![]() The data are from 1940 to present, depending upon when each station was installed. This new version of COOP HPD with faster automations due updated stations will result in faster access for the public. territories in the Caribbean and Pacific from the National Weather Service (NWS) Fischer-Porter Network. The Cooperative Observer Program (COOP) Hourly Precipitation Data (HPD) consists of quality controlled precipitation amounts, which are measurements of hourly accumulation of precipitation, including rain and snow for approximately 2,000 observing stations around the country, and several U.S.
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