There may be an important relationship between the species you hear calling and weather conditions. There are times when weather conditions are inappropriate for data collection. Only monitor if:

  • The air temperature is warmer than 35ºF (2ºC).
  • It is not raining too hard - heavy rain will interfere with your ability to hear the frogs calling.
  • The wind is not stronger than a gentle breeze (3 according to the Beaufort Wind Scale).

The Beaufort Wind Scale

The Beaufort Wind Scale was developed in 1805 by Admiral Sir Francis Beaufort of the British navy to describe wind effects at sea. The Beaufort Scale was later adapted to include effects on land features as well. Use the Beaufort Wind Scale below (also identified on the datasheet) to estimate wind conditions when monitoring.

0 - CALM: smoke rises vertically.
1 - LIGHT AIR: rising smoke drifts; weather vane inactive.
2 - LIGHT BREEZE: leaves rustle; can feel wind on face.
3 - GENTLE BREEZE: leaves and twigs in constant motion; small flags extend.
4 - MODERATE BREEZE: moves small branches; raises dust and loose paper (too windy to monitor).
5 - FRESH BREEZE: small trees in leaf begin to sway (way too windy to monitor).

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