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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 201104 | LHN | AR | 624 | -135 | -136 | -139 | -141 | -142 | -144 | -144 | -145 | -146 | -148 | -148 | -150 | -151 | -152 | -153 | -154 | -154 | -152 | -151 | -150 | -148 |
| 201103 | LHN | AR | 744 | -134 | -135 | -137 | -138 | -139 | -141 | -142 | -142 | -143 | -144 | -145 | -146 | -147 | -148 | -149 | -151 | -151 | -150 | -149 | -148 | -145 |
| 201102 | LHN | AR | 672 | -138 | -139 | -141 | -142 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -154 | -155 | -155 | -151 | -150 | -149 | -147 |
| 201101 | LHN | AR | 744 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -154 | -155 | -156 | -157 | -158 | -160 | -160 | -159 | -156 | -151 | -149 | -148 | -146 |
| 201012 | LHN | AR | 744 | -142 | -143 | -144 | -145 | -146 | -148 | -148 | -150 | -150 | -152 | -152 | -153 | -154 | -155 | -156 | -156 | -155 | -152 | -148 | -146 | -148 |
| 201011 | LHN | AR | 720 | -134 | -136 | -138 | -139 | -141 | -142 | -143 | -144 | -144 | -146 | -146 | -148 | -149 | -150 | -152 | -153 | -151 | -150 | -147 | -146 | -146 |
| 201010 | LHN | AR | 742 | -133 | -135 | -136 | -138 | -139 | -140 | -141 | -142 | -143 | -144 | -144 | -146 | -147 | -149 | -150 | -152 | -152 | -151 | -149 | -148 | -148 |
| 201009 | LHN | AR | 720 | -132 | -134 | -136 | -138 | -139 | -140 | -141 | -141 | -142 | -143 | -144 | -145 | -146 | -148 | -150 | -151 | -150 | -149 | -149 | -149 | -148 |
| 201008 | LHN | AR | 725 | -137 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -146 | -148 | -149 | -151 | -152 | -153 | -155 | -155 | -155 | -156 | -155 | -151 |
| 201007 | LHN | AR | 143 | -137 | -139 | -140 | -142 | -142 | -143 | -144 | -146 | -147 | -149 | -150 | -151 | -152 | -154 | -154 | -156 | -157 | -158 | -158 | -156 | -155 |
| 200905 | LHN | AR | 94 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |
| 200904 | LHN | AR | 683 | -139 | -141 | -142 | -144 | -145 | -145 | -146 | -148 | -149 | -149 | -150 | -151 | -152 | -153 | -154 | -155 | -155 | -153 | -153 | -152 | -149 |
| 200903 | LHN | AR | 744 | -140 | -142 | -144 | -145 | -147 | -149 | -150 | -150 | -152 | -153 | -155 | -155 | -156 | -157 | -158 | -159 | -157 | -154 | -152 | -151 | -149 |
| 200902 | LHN | AR | 667 | -144 | -145 | -147 | -149 | -149 | -151 | -152 | -154 | -155 | -156 | -156 | -157 | -158 | -159 | -159 | -159 | -157 | -154 | -152 | -152 | -147 |
| 200901 | LHN | AR | 680 | -146 | -148 | -150 | -151 | -152 | -153 | -154 | -155 | -156 | -157 | -158 | -158 | -159 | -160 | -160 | -160 | -157 | -153 | -150 | -150 | -147 |
| 200812 | LHN | AR | 720 | -143 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -153 | -154 | -154 | -155 | -155 | -155 | -152 | -150 | -149 | -147 |
| 200811 | LHN | AR | 663 | -143 | -145 | -146 | -148 | -149 | -150 | -151 | -152 | -154 | -154 | -155 | -156 | -157 | -158 | -159 | -159 | -158 | -156 | -152 | -150 | -149 |
| 200810 | LHN | AR | 734 | -142 | -143 | -145 | -146 | -148 | -149 | -151 | -152 | -154 | -156 | -157 | -158 | -159 | -160 | -161 | -161 | -158 | -154 | -151 | -150 | -150 |
| 200809 | LHN | AR | 680 | -141 | -142 | -144 | -145 | -147 | -149 | -150 | -152 | -153 | -155 | -157 | -158 | -160 | -161 | -161 | -162 | -160 | -158 | -155 | -153 | -151 |
| 200808 | LHN | AR | 95 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |