Dataset: Mean monthly temperature at Rothamsted October 1985-September 2017


This dataset represents the mean monthly temperature at Rothamsted from October 1985 - September 2017 and is based on continuous daily records measured at the site.


The mean daily temperature is measured over a 24 hour period 0900 to 0900 GMT and calculated from the daily maximum (Tmax) and minimum temperatures (Tmin); the mean daily tamperature = (Tmax = Tmin)/2. The temperature is recorded at 1.5 m height above the ground surface within a naturally aspirating temperature unit (Stevenson screen). Temperature was first recorded in 1878, Tmax was then measured using a mercury column thermometer and Tmin using a spirit-in-glass with indicator bar minimum thermometer. Data were collected daily manually until 2004 using a standard protocol. Since 2004, temperatures have been recorded automatically by Automatic Weather Station thermistors (electronic temperature probes, Campbell Scientific, Type 107).

Technical Information

Location: Rothamsted Meteorological Station, Harpenden, Hertfordshire, England 51.82 N 0.37 W 128 m asl.

Related Datasets


  • Sarah Perryman: Data manager
  • Tony Scott: Data collector
  • Chris Hall: Data collector
  • Margaret Glendining: Data manager
  • Nathalie Castells-Brooke: Project member
  • Richard Ostler: Project leader
  • Andrew Macdonald: Project manager

Dataset Access and Conditions

Rights Holder

Rothamsted Research


Creative Commons License This dataset is available under a Creative Commons Attribution Licence (4.0).

Cite this Dataset

YOU MUST CITE AS: Sarah Perryman, Tony Scott, Chris Hall (2020). Dataset: Mean monthly temperature at Rothamsted October 1985-September 2017 Electronic Rothamsted Archive, Rothamsted Research 10.23637/rmsmmtemp10850917

Please review our How to Credit Datasets guidance for more information.

Conditions of Use

Rothamsted relies on the integrity of users to ensure that datasets are used appropriately and Rothamsted Research receives suitable acknowledgment as being the originators of these data. Please review the Conditions of Use before downloading.

The monthly summary data contained in this spreadsheet are derived from daily data measured at Rothamsted Meteorological Station, Harpenden. Total monthly data is determined from daily data using Genstat 19th Edition.

Verification includes checks for instrument errors, for missing data and outliers.

The original raw daily data is available, after registering, from the e-RA database. Please contact the e-RA Curators for an access password and further details.

For further information and assistance, please contact the e-RA curators, Sarah Perryman and Margaret Glendining using the e-RA email address: