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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 200711 | LHN | AR | 431 | -139 | -139 | -140 | -140 | -141 | -142 | -144 | -145 | -147 | -147 | -149 | -151 | -152 | -153 | -155 | -156 | -156 | -152 | -150 | -151 | -146 |
| 200710 | LHN | AR | 738 | -148 | -148 | -149 | -150 | -150 | -152 | -153 | -154 | -155 | -157 | -159 | -160 | -161 | -163 | -164 | -165 | -160 | -154 | -150 | -149 | -146 |
| 200709 | LHN | AR | 706 | -149 | -149 | -150 | -151 | -151 | -152 | -152 | -153 | -154 | -156 | -157 | -158 | -160 | -161 | -162 | -163 | -160 | -154 | -153 | -153 | -146 |
| 200708 | LHN | AR | 732 | -149 | -150 | -150 | -150 | -151 | -152 | -153 | -153 | -154 | -156 | -157 | -158 | -159 | -161 | -162 | -163 | -161 | -156 | -156 | -157 | -153 |
| 200707 | LHN | AR | 734 | -148 | -149 | -149 | -150 | -151 | -151 | -152 | -153 | -154 | -156 | -157 | -158 | -159 | -160 | -162 | -163 | -162 | -158 | -157 | -158 | -152 |
| 200706 | LHN | AR | 667 | -148 | -149 | -149 | -150 | -151 | -151 | -152 | -154 | -155 | -155 | -157 | -158 | -160 | -161 | -163 | -165 | -162 | -156 | -156 | -159 | -152 |
| 200705 | LHN | AR | 744 | -148 | -149 | -150 | -151 | -152 | -152 | -154 | -155 | -156 | -157 | -159 | -160 | -162 | -163 | -165 | -165 | -161 | -155 | -156 | -157 | -150 |
| 200704 | LHN | AR | 690 | -144 | -145 | -146 | -147 | -148 | -150 | -151 | -152 | -153 | -154 | -155 | -157 | -158 | -159 | -160 | -161 | -158 | -151 | -149 | -149 | -143 |
| 200703 | LHN | AR | 692 | -140 | -141 | -141 | -142 | -142 | -144 | -145 | -147 | -148 | -150 | -151 | -152 | -154 | -156 | -157 | -159 | -156 | -151 | -151 | -150 | -145 |
| 200702 | LHN | AR | 672 | -130 | -131 | -132 | -133 | -134 | -135 | -136 | -138 | -139 | -141 | -143 | -145 | -148 | -149 | -151 | -152 | -152 | -150 | -148 | -147 | -142 |
| 200701 | LHN | AR | 740 | -127 | -128 | -129 | -131 | -132 | -133 | -135 | -136 | -138 | -139 | -141 | -143 | -145 | -147 | -149 | -150 | -150 | -147 | -146 | -147 | -141 |
| 200612 | LHN | AR | 744 | -128 | -129 | -130 | -131 | -133 | -134 | -136 | -137 | -139 | -141 | -143 | -145 | -147 | -148 | -150 | -151 | -150 | -148 | -147 | -147 | -142 |
| 200611 | LHN | AR | 720 | -138 | -139 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -148 | -150 | -151 | -152 | -155 | -156 | -157 | -153 | -151 | -150 | -145 |
| 200610 | LHN | AR | 743 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -155 | -157 | -158 | -159 | -161 | -163 | -163 | -159 | -155 | -152 | -151 | -148 |
| 200609 | LHN | AR | 720 | -145 | -146 | -147 | -147 | -148 | -148 | -149 | -150 | -151 | -153 | -154 | -156 | -157 | -159 | -160 | -161 | -158 | -154 | -153 | -153 | -145 |
| 200608 | LHN | AR | 744 | -146 | -146 | -147 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -154 | -155 | -157 | -158 | -159 | -160 | -160 | -156 | -157 | -157 | -151 |
| 200607 | LHN | AR | 744 | -147 | -147 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -155 | -156 | -157 | -158 | -159 | -161 | -162 | -159 | -155 | -155 | -157 | -150 |
| 200606 | LHN | AR | 695 | -147 | -148 | -148 | -150 | -151 | -152 | -153 | -154 | -156 | -157 | -158 | -159 | -161 | -162 | -164 | -164 | -158 | -154 | -154 | -156 | -145 |
| 200605 | LHN | AR | 744 | -147 | -147 | -148 | -149 | -150 | -151 | -153 | -153 | -155 | -157 | -158 | -159 | -161 | -163 | -164 | -164 | -161 | -155 | -153 | -154 | -147 |
| 200604 | LHN | AR | 717 | -137 | -138 | -138 | -139 | -140 | -141 | -142 | -144 | -146 | -147 | -148 | -149 | -151 | -152 | -154 | -156 | -156 | -154 | -152 | -151 | -146 |
| 200603 | LHN | AR | 740 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -138 | -140 | -141 | -143 | -145 | -147 | -148 | -150 | -151 | -152 | -150 | -149 | -148 | -144 |
| 200602 | LHN | AR | 672 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -139 | -141 | -143 | -144 | -146 | -148 | -149 | -151 | -152 | -151 | -149 | -148 | -149 | -147 |
| 200601 | LHN | AR | 744 | -130 | -130 | -132 | -133 | -134 | -135 | -136 | -137 | -139 | -140 | -142 | -144 | -145 | -147 | -149 | -150 | -150 | -148 | -146 | -146 | -137 |