Daily Climatology & Records

Introduction: This portal provides a detailed climatological analysis for Maryland as a whole, its counties and climate divisions at daily resolution from NCEI's nClimGrid-Daily area-averaged dataset. The data presented here allows for the comparison of the daily temperatures and precipitation with the current (1991-2020) and 20th century (1951-2000) daily normals and their historical records. These datasets are critical for understanding regional climate variability and identifying significant atmospheric trends across the state.

Maryland Statewide: Mean Temperature

Figure Description: The figure above displays the daily climatological progression for the period 1951 to 2025. The black line represents the daily mean value, while the shaded area illustrates the full envelope of historical variability, that is the historical maximum (red) and minimum (blue) for the day through the record range. Annotations highlight the absolute maximum (red) and minimum (blue) values recorded for each month, including the specific day of occurrence. Temperatures are in degrees Fahrenheit (°F) and precipitation in inches.

Table Metadata: This table provides the underlying data used in the climate analysis. Daily Normals are calculated as the arithmetic mean for the specified 30 or 50-year periods. Historical Records display the highest and lowest values observed for each calendar day since 1951. Precipitation values are reported in inches, while temperature values are reported in degrees Fahrenheit (°F).