nClimGrid Historical Observations Precipitation Totals

The Climate Resilience Information System (CRIS) provides data and tools for developers of climate services. This layer has historical variables in decadal increments from 1950 to 2020 derived from historical observations of air temperature and precipitation. The variables included are: Annual total precipitation (inches) Annual highest precipitation total for a single day (inches) Annual highest precipitation total over a 5-day period (inches) Annual highest precipitation total over a 10-day period (inches) Daily non-zero precipitation 90th percentile value (inches) Daily non-zero precipitation 95th percentile value (inches) Daily non-zero precipitation 99th percentile value (inches) Annual total precipitation for all days exceeding the 90th percentile (inches) Annual total precipitation for all days exceeding the 95th percentile (inches) Annual total precipitation for all days exceeding the 99th percentile (inches) This layer uses data from the NOAA Monthly U.S. Climate Gridded Dataset (nClimGrid). Further processing by Esri is explained below. For each variable, there are mean values for the defined respective geography: counties, tribal areas, HUC-8 watersheds. The process for deriving these summaries is available from the CRIS Website’s About the Data. Other climate variables are available from the CRIS Data page. Additional geographies, including Alaska, Hawai’i and Puerto Rico will be made available in the future. Geographies This layer provides historic values for three geographies: county, tribal area, and HUC-8 watersheds. County: based on the U.S. Census TIGER/Line 2022 distribution. Tribal areas: based on the U.S. Census American Indian/Alaska Native/Native Hawaiian Area dataset 2022 distribution. This dataset includes federal- and state-recognized statistical areas. HUC-8 watershed: based on the USGS Washed Boundary Dataset, part of the National Hydrography Database Plus High Resolution. Time Ranges Historic climate threshold values (e.g. Days Over 90°F) were calculated for each year from 1950 to 2020. To ensure the layer displays time correctly, under 'Map properties' set Time zone to 'Universal Coordinated Time (UTC)' and under 'Time slider options' set Time intervals to '1 Decade'. Data Citation Vose, Russell S., Applequist, Scott, Squires, Mike, Durre, Imke, Menne, Matthew J., Williams, Claude N. Jr., Fenimore, Chris, Gleason, Karin, and Arndt, Derek (2014): NOAA Monthly U.S. Climate Gridded Dataset (nClimGrid), Version 1. NOAA National Centers for Environmental Information. https://doi.org/10.7289/V5SX6B56. Data Export Exporting this data into shapefiles, geodatabases, GeoJSON, etc is enabled.气候韧性信息系统（Climate Resilience Information System, CRIS）为气候服务开发者提供数据与工具。本图层包含1950年至2020年以十年为间隔的历史变量数据集，数据源自气温与降水的历史观测资料。涵盖的变量包括：年总降水量（单位：英寸）、单日最大降水量（单位：英寸）、5日最大累计降水量（单位：英寸）、10日最大累计降水量（单位：英寸）、日非零降水量第90百分位值（单位：英寸）、日非零降水量第95百分位值（单位：英寸）、日非零降水量第99百分位值（单位：英寸）、日降水量超过第90百分位的年总降水量（单位：英寸）、日降水量超过第95百分位的年总降水量（单位：英寸）、日降水量超过第99百分位的年总降水量（单位：英寸）。本图层采用美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）月度美国气候网格化数据集（nClimGrid）的数据，后续由Esri开展的处理说明如下。针对每个变量，均已针对预设地理区域计算得到平均值，涵盖县、部落领地、HUC-8流域三类空间单元。上述汇总数据的生成流程可从CRIS官网的"数据说明"板块获取。CRIS数据页面还提供其他气候变量。未来将推出包含阿拉斯加、夏威夷及波多黎各在内的更多地理区域数据。地理区域：本图层为三类地理区域提供历史数值：县、部落领地及HUC-8流域。县界基于2022年美国人口普查TIGER/Line数据集发布版本绘制。部落领地基于2022年美国人口普查美洲印第安人/阿拉斯加原住民/夏威夷原住民领地数据集发布版本，该数据集包含联邦及州政府认定的统计区域。HUC-8流域基于美国地质调查局（United States Geological Survey, USGS）冲刷边界数据集，该数据集属于国家水文数据库高精度增强版（National Hydrography Database Plus High Resolution）的组成部分。时间范围：本数据集针对1950年至2020年的每一年计算得到历史气候阈值（例如"超过90华氏度的天数"）。为确保地图正确显示时间，请在"地图属性"中将时区设置为"协调世界时（UTC）"，并在"时间滑块选项"中将时间间隔设置为"十年间隔"。数据引用：Vose, Russell S., Applequist, Scott, Squires, Mike, Durre, Imke, Menne, Matthew J., Williams, Claude N. Jr., Fenimore, Chris, Gleason, Karin, and Arndt, Derek (2014): NOAA月度美国气候网格化数据集（nClimGrid），版本1。美国国家海洋和大气管理局国家环境信息中心。https://doi.org/10.7289/V5SX6B56。数据导出：支持将本数据导出为Shapefile、地理数据库、GeoJSON等格式。