nClimGrid Historical Observations Cold Days

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 number of days with a minimum temperature less than or equal to 0°F Annual number of days with a minimum temperature less than or equal to 28°F Annual number of days with a minimum temperature less than or equal to 32°F Annual number of days with a maximum temperature less than or equal to 32°F 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年以十年为步长的历史变量，此类变量基于气温与降水的历史观测数据计算得到。包含的变量如下： - 最低气温小于等于0华氏度的年度天数 - 最低气温小于等于28华氏度的年度天数 - 最低气温小于等于32华氏度的年度天数 - 最高气温小于等于32华氏度的年度天数 本图层数据依托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）生成，Esri的进一步处理说明如下。针对每个变量，本图层均提供各指定地理区域的平均值，涵盖县、部落领地及HUC-8流域。此类汇总统计数据的生成流程可从CRIS官网的“数据概览”栏目获取。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：基于美国人口普查局2022版TIGER/Line发布数据。 - 部落领地：基于美国人口普查局2022版发布的《美国印第安人/阿拉斯加原住民/夏威夷原住民区域数据集》，该数据集包含联邦及州政府认可的统计区域。 - 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，属于全国水文数据库Plus高分辨率系列。 ### 时间范围 1950年至2020年的逐年历史气候阈值（例如“超过90华氏度的天数”）均已完成计算。为确保图层正确显示时间，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“1十年”。 ### 数据引用 Vose, Russell S.、Applequist, Scott、Squires, Mike、Durre, Imke、Menne, Matthew J.、Williams, Claude N. Jr.、Fenimore, Chris、Gleason, Karin及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。