nClimGrid Historical Observations Warm Nights

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 greater than or equal to 60°F Annual number of days with a minimum temperature greater than or equal to 70°F Annual number of days with a minimum temperature greater than or equal to 75°F Annual number of days with a minimum temperature greater than or equal to 80°F Annual number of days with a minimum temperature greater than or equal to 85°F Annual number of days with a minimum temperature greater than or equal to 90°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支持。该数据集图层包含1950年至2020年间以十年为步长的历史气候变量，数据源自气温与降水的历史观测记录。所涵盖的变量包括：年最低气温≥60°F的天数、年最低气温≥70°F的天数、年最低气温≥75°F的天数、年最低气温≥80°F的天数、年最低气温≥85°F的天数、年最低气温≥90°F的天数。 该图层所用数据源自美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）月度美国气候格点数据集（NOAA Monthly U.S. Climate Gridded Dataset, nClimGrid）。Esri对该数据的后续处理流程详见下文。 针对每个变量，该图层提供预设地理区域的平均值，涵盖县、部落区域以及8级水文单元流域（Hydrologic Unit Code 8, HUC-8）。上述汇总数据的生成流程可从CRIS官网的"数据概览"栏目获取。其他气候变量可从CRIS数据页面获取。未来将新增包括阿拉斯加、夏威夷及波多黎各在内的更多地理区域数据。 ### 地理区域 该图层为三类地理区域提供历史数值：县、部落区域以及8级水文单元流域。 1. 县界：基于美国人口普查局2022版TIGER/Line矢量数据集制作。 2. 部落区域：基于美国人口普查局2022版美国印第安人/阿拉斯加原住民/夏威夷原住民区域数据集制作，该数据集包含联邦及州政府认可的统计区域。 3. 8级水文单元流域：基于美国地质调查局（United States Geological Survey, USGS）冲刷边界数据集制作，该数据集属于全国高分辨率水文数据库增强版（National Hydrography Database Plus High Resolution）的一部分。 ### 时间范围 历史气候阈值（例如≥90°F天数）的计算年份覆盖1950年至2020年。为确保图层时间显示正确，请在"地图属性（Map properties）"中将时区设置为"协调世界时（Universal Coordinated Time, UTC）"，并在"时间滑块选项（Time slider options）"中将时间间隔设置为"1 Decade"。 ### 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月度美国气候格点数据集（nClimGrid）第1版。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 支持将该数据导出为Shapefile、地理数据库、GeoJSON等格式。