• Wind speed
  
• Wind direction
  
• Clouds
  

If you want to be even more accurate and you have the right instruments you can also record:

• Temperature
  
• "Barometric" pressure or air pressure
  
  

Beaufort wind scale (for estimating how windy it is)

1. Calm air 0km/h
2. Light air (smoke drifts) 2-6km/h
3. Light breeze (leaves rustle) 7-11km/h
4. Gentle breeze (Raises light flag) 13-19km/h
5. Moderate breeze (raises paper, leaves) 20-30kn/h
6. Fresh breeze (small trees sway) 31-38km/h
7. Strong breeze (large branches, whistling heard) 40-49km/h
8. Near gale (trees move, hard to walk against) 51-61km/h
9. Gale (breaks twigs, impedes progress) 62-74km/h
10. Strong gale (breaks branches) 76-86km/h
11. Storm (trees uprooted, severe damage) 88-100km/h

You can look to see which way the clouds are blowing to check the wind direction, or if there are no clouds you can use at trees or smoke from chimneys as clues. The wind direction is always recorded as the direction the wind is blowing from. You can face into the wind and find which direction you are looking. For example if you are facing South, the wind would be called a Southerly.

There are ten main cloud types. They are...

High altitude clouds:
1. Cirrus (very high wispy thin clouds)
2. Cirrocumulus (very high thin fluffy clouds)
3. Cirrostratus (a thin sheet of high cloud)

Medium altitude clouds:
4. Altocumulus (high fluffy clouds)
5. Altostratus (a wide sheet of high cloud)
6. Nimbostratus (sheet of high cloud with light rain)

Low altitude clouds:
7. Stratocumulus (a low sheet of fluffy clouds)
8. Stratus (sheet of flat low cloud or fog)
9. Cumulus (fluffy clouds)
10.Cumulonimbus (raining fluffy clouds)

Special clouds:
Imaginacumulus (fluffy clouds that look like people, animals or anything other than just an ordinary cloud)
Invisiblenimbus (Those sneaky clouds that hit you with a rain drop on a sunny day)
Vapour trails (Clouds made by the hot exhaust of jets)

If you have a thermometer you can measure the temperature. It is best to record the temperature early in the morning to get the days "minimum" temperature, then in the afternoon to get the "maximum" temperature. If you know the temperature and the windspeed, you can work out what the windchill factor is. Windchill is how cold the wind makes you feel, the chart below can be used to work out the windchill factor... Brrrr!

       Air temperature (Degrees Celcius):
            8   4   0   -4   -8 -12 -16
W 70    -7 -14 -20 -27 -33 -40 -46
I   60    -7 -13 -19 -26 -32 -39 -45
N  50    -6 -12 -18 -25 -31 -37 -43
D  40    -5 -11 -17 -23 -29 -35 -41
S  30     -3  -8 -14 -20 -25 -31 -37
P  20       0 -5 -10 -15 -21 -26 -31
E  10     +5  0   -4  -8 -13 -17 -22
E         Wind chill factor (Degrees Celsius)
D  (Km/h)