Access and Analyze Hourly Weather/Climate Time Series

This web-tool extracts time-series or sets of highest/lowest value dates from different reanalysis datasets. These dates can be saved and used in the sub-daily composite web page to investigate climate/weather events. A separate page provides time-series of daily data.

Select variable/level. You can limit the selection to a set or range of years and a particular season. There is a 30 year limit. 20CRV3 is large and <10 years is advised. Longer time periods will take a while and may time out.

To save timeseries, when on the result page with time-series, select from browser file menu"Save As" or similar to a preferred filename.

Time-series Selection
Variable from the NCEP Reanalysis dataset (1948-2019)
Variable: Pressure level?
OR: Variable from the 20thC V3 dataset (1836-2015)
Variable? Pressure level? Statistic?
OR: Variable from the 20thC V2c dataset (1851-2014)
Variable: Pressure level:
OR: Variable from the ERA-Interim dataset (1979-2019)
Variable: Level:
OR: Variable from the ERA5 dataset (1979-2019). Select only 1-2 years due to data size.
Variable: Level:
Grid Box Latitude: Longitude:
Select (times) of day (optional). Some var/datasets are 4 times daily and others are 8.
0Z  3Z  6Z 9Z  12Z   15Z  18Z  21Z  All
Type of Output
Get timeseries Get subset of dates
Highest Lowest Days from season/years selected
OR   Value to composite on Type of comparison:
Season/Year Refinement
Beginning month of season Ending month
Enter range of years
OR Enter Years to use (from 1 to 20) e.g. 1972. For seasons that span a year (e.g. DJF), please enter year of the LAST month.

Time-series Extraction Information
In order to help ensure that this web analysis page remains available, we would greatly appreciate feedback on its use, particularly in the classroom, for presentations or for research. Mail to (
Extract 4 or 8 Hourly Time-series
Help and Background
Related Time Series Analysis Pages
Extract Daily Time-series
Extract Monthly Time-series
Plot and analyze monthly time series
Plot daily gridded composites
Data Documentation
NCEP/NCAR Reanalysis
20th Century Reanalysis
Daily Index time-series