Rain Gauge Carefully cut around the plastic bottle, about two-thirds of the way up. Turn the top part of the bottle upside down and place it inside the bottom part, fixing it in place using the tape. Using a ruler, write a scale in centimeters on a piece of tape and fix it to the side of your bottle.
Make your own 1
2 Tape 3 Scissors
An empty 2-litre plastic bottle
(a fizzy drink bottle would be ideal)
4 5
Find an open space away from trees in which to place your rain gauge. Dig a hole and bury your rain gauge so that the top is sticking about 5 cm out of the ground. This will stop the rain gauge from blowing down on windy days. You will need to remove your rain gauge from the ground each time you want to take a reading.
Pencil
You will need: Ruler
Make your own Okta Scale
You will need:
Black marker
Mirror (preferably square)
1 2
3
Use the marker and ruler to divide your square mirror into eight equal parts. Place your mirror flat on the ground away from any trees or buildings that might obstruct its ability to reflect the sky. Use the Okta Scale to count how many of the squares in the mirror are at least half-filled with reflected cloud cover. This indicates the Okta Scale for the section of sky reflected.
