This is used in lecture, the students are given a handout and slides of various biomes are projected. The students are then asked to predict which variables determine the location of a biome and to represent this graphically. The graphs are then collected and projected. A separate web tutorial can be used before or after class to reinforce these concepts.
We give average data for several specific locations. Another option would be to give a range of temperatures and precipitations for each biome, to generate a more general graph.
The materials are at the following link.