. 2017 Aug 16;4(8):170594. doi: 10.1098/rsos.170594

Table 2.

Mean ± s.d. values of meteorological measurements and of background noise collected at four different times within 24 h. Values that share similar superscript letters did not differ significantly (Wilcoxon signed-rank tests, p > 0.05; electronic supplementary material, table S1). Background noise was recorded in the same place as where the propagation experiment was completed.

24 h period	temperature (°C)	humidity (%)	wind speed (m s⁻¹)	background noise (dB)
afternoon	21.4 ± 4.7	25.2 ± 14.2	4. 9 ± 2.8	58 ± 8.2^b
dusk	20.3 ± 5	31.1 ± 18.5	5.5 ± 2.5	53.9 ± 4.1
night	10.7 ± 3.3	60.4 ± 16.9	2.4 ± 2.2^a	48.7 ± 4.2
dawn	9.8 ± 3.2	63.1 ± 16. 9	2.3 ± 2^a	58.4 ± 5.3^b