Daymet Annual Climate Summaries on a 1-km North American Grid

Daymet Version 4 R1 provides annual climate summaries at a 1 km x 1 km spatial resolution for North America, Hawaii, and Puerto Rico. The dataset includes five variables: annual averages for minimum temperature, maximum temperature, vapor pressure, and snow water equivalent, plus annual totals for precipitation. It is produced by NASA and derived from daily Daymet data, with specific corrections applied to the 2020 and 2021 files for high-latitude areas.

Use Cases

• Analyzing long-term temperature trends using the annual minimum and maximum temperature averages.
• Modeling regional water budgets by combining annual precipitation totals with snow water equivalent data.
• Studying atmospheric humidity patterns across North America with the annual vapor pressure averages.
• Comparing climate variables between continental North America, Hawaii, and Puerto Rico using the separate regional files.
• Investigating corrections in high-latitude data for the years 2020 and 2021, which were updated with new GHCNd inputs.

Strengths

• Provides data at a high 1 km x 1 km spatial resolution for detailed regional analysis.
• Covers a long period of record, matching the Daymet V4 R1 daily data timeline.
• Includes corrected 2020 and 2021 files (60 total) specifically improved for Canadian high-latitude predictions.
• Data is distributed in standardized, interoperable CF-compliant netCDF and Cloud Optimized GeoTIFF formats.

Limitations

• Sources conflict on the last update date: one lists 2026-03-13, another lists 2024-12-31.
• Key metadata such as row count, total size, and specific column names are not provided by any platform.
• The license is listed as 'other-license-specified' on one platform but is 'None' on another, creating uncertainty.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Derived from Daymet Version 4 R1 daily weather parameter datasets.

Time Range

Period of record matches the Daymet V4 R1 daily data (specific start year not provided).

Freshness

2026-03-13 03:18:43.579646

Geography

North America (Canada, United States, Mexico), Hawaii, and Puerto Rico.