Daymet V4 Monthly Mean Daylength (2024) — North America (Native Lambert Conformal Conic, 1 km)

DescriptionThis dataset provides monthly mean daylength (seconds per day) for North America during the year 2024, derived from the Daymet Version 4 R1 daily daylength (dayl) product.Daily values from the original Daymet NetCDF files were averaged to monthly means and exported as a single multi-layer GeoTIFF (12 bands = January–December).The data remain in the native Daymet Lambert Conformal Conic (LCC) projection, matching the coordinate system used by the NASA ORNL DAAC Daymet archive. Variable• dayl – Monthly mean daylength (s day⁻¹), layers 1–12 = January–December 2024 Spatial coverageContinental North America (approx. 15 ° N – 85 ° N, 180 ° W – 50 ° W) Projection and coordinate reference systemProjection: Lambert Conformal Conic (2 Standard Parallels)Definition: +proj=lcc +lat_1=25 +lat_2=60 +lat_0=42.5 +lon_0=-100 +x_0=0 +y_0=0 +ellps=WGS84 +units=m +no_defsUnits: metresResolution: ≈ 1 km (native Daymet grid) Processing summary• Daily → monthly mean aggregation• Output as GeoTIFF (12 bands, DEFLATE compression)• No reprojection or resampling — native Daymet grid retained CitationPlease cite both this Zenodo record and the original Daymet dataset: Thornton, P. E., Running, S. W., et al. (2023). Daymet V4 R1: Daily Surface Weather Data on a 1-km Grid for North America, Version 4 R1. ORNL DAAC. https://doi.org/10.3334/ORNLDAAC/2129 LicenseThis derived dataset is distributed under Creative Commons Attribution 4.0 (CC BY 4.0), consistent with the public-domain status of the underlying Daymet data. AcknowledgementsOriginal Daymet data provided by the NASA ORNL Distributed Active Archive Center (DAAC).