National Temperature Index

FAQ

Why not display USCRN absolute temperatures?

As was shown under the NTI tab, the normal temperatures for nClimDiv stations are different than those for USCRN stations due to differences in location, station exposure, and instrumentation. For example, June maximum temperatures are warmer in absolute terms at nClimDiv sites, so USCRN absolute national maximum temperatures would tend to be about 1.5°F less even if both are exactly normal for each network that month. To avoid the confusion of an apples-to-oranges comparison, both USCRN and nClimDiv national temperature index values are represented as anomalies from their respective normals. nClimDiv absolute temperatures for the nation or climate regions can be seen on NCDC's Climate at a Glance.