Subdaily Precipitation and Humidity Measurements by Louis Morin in the Late Maunder Minimum in Paris

Based on copies (source: Oeschger Center for Climate Change Research) of the original measurements of Louis Morin in Paris, we digitized the meteorological variables precipitation and humidity. Precipitation data were recorded three to six times daily from 1665 - 1709 and humidity data were recorded three times daily from 1701 - 1709. Both variables are not given in common units, so the first step is to calibrate and transform them into common units. Precipitation is differently noted in rain and snow and furthermore the values are subjectively measured in precipitation duration and precipitation intensity. Nothing is known about the method Morin used to measure humidity. Nevertheless, the values show a correlation with the diurnal cycle, as well as with precipitation data. An internal validation can be done with the already analyzed meteorological variables of Morin (temperature, cloud cover and direction of the movement of the clouds) with the variables of interest for us. Due to the thorough and daily records, we can perform an analysis of consecutive wet days (CWD) and consecutive dry days (CDD). The analysis of these variables brings a more comprehensive insight into the regional climate of Paris in the Late Maunder Minimum.