Use these controls to limit the stations used with other functions.
For instance, of the 5,255 available GHCN adjusted land sites,
To display individual sites in the lower plot, select *station* and click on the site. To display purple (restricted) sites in the lower plot, turn off *Align stations on common baseline*.
Normally, the trend line is fitted to the displayed, averaged data. A full regression fits the trend line to all the data (perhaps 200,000 points), not just the plotted data (about 100 points). As a result, the slope and the R2 values will be different.
using all the data points from all stations
The Null Hypothesis is that the temperature change is indistinguishable from zero. For this to be true, ....
Load Local Data
Standard deviation (σ)
The values are not meaningful if the average is "Corrected for station distribution"
The delta value is used to apply a window to the "null" condition.
The temperature comparisons apply only to selected stations.
For Endpoint delta, Previous High, and Previous Low, a white circle indicates a lack of data at one, or both, of the specified dates. For the Trend option, white indicate fewer the 3 samples in the range.
UCAR and Keeling CO2 Data
The Keeling data (1958 to present - only the August averages are plotted) is almost identical to the UCAR data for that period.
Sensitivity - ΔT when CO2 is doubled
Functions to compare Raw and Adjusted data
Both the Raw (Unadjusted) and Adjusted data must be loaded for these functions to work.
Filters to help compare Raw and Adjusted data
The features on this page will not functional unless both an adjusted and an unadjusted (raw) pair of datasets is loaded.
Note that all the adjusted stations match a raw station, but that there are 294 more raw stations than adjusted stations.
Each island is associated with a nearby ocean "station". The ocean values are fairly bogus - the same values are in the raw and adjusted databases.
Limit stations to 50 years of data from 1950 to 2010
The data range for computing the Baseline Average Temperature is set on the Basic Filters tab
Temperature Heat Map