University of Illinois
University of Illinois Urbana Champaign: Observed Dew Point Temperature
Describes what dew point is and how it relates to moisture content of the air. Also explains condensation and relative humidity.
Other
Ics: Temperature, Humidity, and Dew Point
This site provides a discussion of dew point and relative humidity, containing formulas that look at connections between temperature, humidity, and dew point.
University of Illinois
University of Illinois Extension: Moisture in the Air Humidity
Have you ever walked outside in the summer and the felt sticky? You are experiencing humidity. Learn more about humidity, relative humidity, and dew point temperature on this website.
Dan Satterfield
Dan's Wild Weather: Humidity
Explains how dew point is used to show the amount of moisture in the air. Gives an activity for measuring the dew point at home.
Other
The Weather Company: The Weather Underground
Source of weather maps, forecasts, images, and data for the world. Maps include temperature, radar, visibility, wind, heat index, wind chill, humidity, and dew point.
USA Today
Usa Today: Weather Basics: Understanding Humidity
This article is a guide to understanding humidity and related weather concepts. Includes helpful definitions of multiple terms.
University of Wisconsin
Atmospheric and Oceanic Sciences: Surface Weather Analysis
Explains the use of synoptic weather analysis in preparing weather maps and forecasting. Discusses the use of symbols as well.
NASA
Sci Jinks: Precipitation Simulator
Manipulate the dew points and temperature points in the activity to create different forms of precipitation.