Noise Levels at Different Periods
The table below gives the decibel 10% noise level (in db) for each month in
several period bands. The 10% noise level is defined as the signal
level not exceeded 10% of the time, based on hourly measurements. Each entry in the
table is color coded with reference to the New Low Noise Model (NLNM, Peterson, 1993):
navy, -6 db < value-NLNM < -3 db
blue, -3 db < value-NLNM < 3 db
aqua, 3 db < value-NLNM < 6 db
lime, 6 db < value-NLNM < 9 db
yellow, 9 db < value-NLNM < 12 db
orange, 12 db < value-NLNM < 15 db
red, 15 db < value-NLNM < 20 db
fuchsia, 20 db < value-NLNM < 25 db
silver, value-NLNM < -6 db, value-NLNM > 25 db
Black indicates that there was an insufficient number of hourly measurements to calculate a noise level.
| Month | Chan. | Qual. | # obs. | 268s | 228s | 193s | 164s | 139s | 118s | 100s | 85s | 72s | 61s | 52s | 44s | 37s | 32s | 27s | 23s | 19s | 16s | 14s | 12s | 10s |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 201105 | LHE | AR | 207 | -146 | -147 | -148 | -148 | -151 | -152 | -153 | -153 | -154 | -155 | -155 | -157 | -158 | -159 | -159 | -160 | -156 | -155 | -155 | -152 | -149 |
| 201104 | LHE | AR | 719 | -143 | -144 | -145 | -146 | -148 | -148 | -150 | -150 | -150 | -151 | -151 | -152 | -152 | -152 | -152 | -151 | -151 | -149 | -150 | -149 | -146 |
| 201103 | LHE | AR | 692 | -142 | -143 | -144 | -145 | -147 | -147 | -148 | -149 | -150 | -151 | -152 | -152 | -152 | -152 | -153 | -152 | -151 | -149 | -148 | -147 | -145 |
| 201102 | LHE | AR | 649 | -136 | -138 | -139 | -140 | -141 | -142 | -143 | -144 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -150 | -150 | -147 | -147 | -146 | -144 |
| 201101 | LHE | AR | 596 | -139 | -140 | -141 | -142 | -144 | -145 | -146 | -147 | -147 | -149 | -150 | -151 | -152 | -153 | -154 | -154 | -152 | -149 | -147 | -146 | -143 |
| 201012 | LHE | AR | 744 | -139 | -140 | -141 | -142 | -143 | -143 | -145 | -146 | -146 | -147 | -148 | -150 | -151 | -153 | -153 | -155 | -155 | -151 | -147 | -145 | -146 |
| 201011 | LHE | AR | 719 | -167 | -168 | -170 | -172 | -173 | -173 | -174 | -174 | -174 | -173 | -173 | -172 | -171 | -171 | -170 | -170 | -169 | -168 | -167 | -166 | -165 |
| 201010 | LHE | AR | 742 | -143 | -143 | -145 | -145 | -145 | -145 | -145 | -144 | -143 | -142 | -140 | -139 | -137 | -136 | -134 | -133 | -131 | -130 | -128 | -127 | -125 |
| 201009 | LHE | AR | 720 | -143 | -144 | -144 | -145 | -146 | -146 | -145 | -144 | -143 | -142 | -140 | -139 | -138 | -136 | -135 | -133 | -132 | -130 | -129 | -127 | -126 |
| 201008 | LHE | AR | 724 | -147 | -149 | -150 | -151 | -153 | -154 | -155 | -156 | -156 | -157 | -158 | -159 | -158 | -159 | -160 | -160 | -157 | -155 | -156 | -156 | -151 |
| 201007 | LHE | AR | 744 | -144 | -145 | -147 | -148 | -150 | -151 | -153 | -154 | -154 | -155 | -156 | -156 | -157 | -158 | -158 | -158 | -157 | -155 | -156 | -155 | -151 |
| 201006 | LHE | AR | 671 | -143 | -145 | -147 | -148 | -149 | -150 | -151 | -153 | -153 | -154 | -154 | -155 | -155 | -156 | -156 | -156 | -156 | -154 | -155 | -155 | -150 |
| 200905 | LHE | AR | 302 | -140 | -142 | -143 | -144 | -146 | -146 | -148 | -149 | -150 | -151 | -152 | -153 | -154 | -156 | -157 | -158 | -158 | -156 | -156 | -156 | -152 |
| 200904 | LHE | AR | 590 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 |
| 200903 | LHE | AR | 569 | -135 | -137 | -138 | -139 | -140 | -141 | -143 | -143 | -144 | -145 | -146 | -146 | -147 | -148 | -149 | -149 | -150 | -150 | -149 | -149 | -149 |
| 200902 | LHE | AR | 664 | -136 | -138 | -140 | -141 | -143 | -144 | -145 | -146 | -148 | -149 | -150 | -151 | -152 | -152 | -153 | -153 | -153 | -150 | -149 | -149 | -145 |
| 200901 | LHE | AR | 688 | -133 | -135 | -137 | -138 | -139 | -140 | -142 | -143 | -144 | -145 | -147 | -147 | -148 | -149 | -150 | -150 | -149 | -148 | -148 | -148 | -146 |
| 200812 | LHE | AR | 715 | -131 | -132 | -134 | -135 | -136 | -137 | -138 | -139 | -140 | -142 | -142 | -143 | -144 | -145 | -146 | -147 | -148 | -147 | -148 | -147 | -145 |
| 200811 | LHE | AR | 662 | -134 | -136 | -137 | -138 | -140 | -142 | -143 | -144 | -145 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -152 | -151 | -150 | -148 | -146 |
| 200810 | LHE | AR | 680 | -138 | -139 | -142 | -143 | -145 | -146 | -147 | -148 | -150 | -151 | -152 | -153 | -153 | -155 | -155 | -156 | -154 | -151 | -149 | -148 | -147 |
| 200809 | LHE | AR | 623 | -141 | -142 | -143 | -145 | -146 | -148 | -149 | -150 | -151 | -152 | -153 | -154 | -155 | -156 | -158 | -158 | -157 | -154 | -152 | -151 | -148 |
| 200808 | LHE | AR | 93 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |