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 | 8s | 7s | 6s | 5s | 4s |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 201109 | LHN-10 | AR | 2830 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -154 | -155 | -156 | -157 | -159 | -161 | -162 | -161 | -158 | -154 | -151 | -148 | -145 | -131 | -121 | -113 | -110 |
| 201108 | LHN-10 | AR | 2976 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -155 | -156 | -157 | -158 | -159 | -161 | -162 | -163 | -163 | -161 | -160 | -159 | -156 | -151 | -146 | -138 | -125 | -118 |
| 201107 | LHN-10 | AR | 2976 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -155 | -156 | -157 | -157 | -158 | -160 | -162 | -164 | -164 | -161 | -161 | -158 | -154 | -151 | -148 | -141 | -129 | -119 |
| 201106 | LHN-10 | AR | 2880 | -140 | -141 | -142 | -142 | -143 | -144 | -145 | -146 | -147 | -149 | -150 | -151 | -153 | -155 | -157 | -159 | -160 | -159 | -159 | -158 | -155 | -151 | -146 | -136 | -124 | -121 |
| 201105 | LHN-10 | AR | 2976 | -143 | -144 | -145 | -146 | -147 | -148 | -149 | -151 | -152 | -153 | -154 | -155 | -156 | -157 | -159 | -161 | -162 | -160 | -160 | -157 | -153 | -149 | -145 | -134 | -122 | -118 |
| 201104 | LHN-10 | AR | 2880 | -144 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -154 | -155 | -157 | -158 | -160 | -160 | -157 | -152 | -147 | -147 | -143 | -126 | -112 | -109 | -108 |
| 201103 | LHN-10 | AR | 2976 | -144 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -151 | -152 | -153 | -155 | -156 | -157 | -159 | -158 | -153 | -149 | -146 | -147 | -140 | -126 | -112 | -109 | -110 |
| 201102 | LHN-10 | AR | 2680 | -143 | -143 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -154 | -156 | -157 | -158 | -155 | -149 | -146 | -145 | -143 | -127 | -113 | -103 | -102 | -104 |
| 201101 | LHN-10 | AR | 2975 | -145 | -145 | -146 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -155 | -155 | -157 | -157 | -159 | -157 | -151 | -146 | -144 | -145 | -137 | -118 | -111 | -108 | -109 |
| 201012 | LHN-10 | AR | 2976 | -144 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -152 | -154 | -155 | -156 | -157 | -159 | -160 | -156 | -150 | -146 | -147 | -145 | -133 | -119 | -112 | -111 |
| 201011 | LHN-10 | AR | 2880 | -142 | -143 | -143 | -144 | -145 | -145 | -146 | -147 | -148 | -148 | -149 | -150 | -152 | -153 | -154 | -156 | -156 | -154 | -149 | -146 | -146 | -143 | -128 | -113 | -110 | -111 |
| 201010 | LHN-10 | AR | 2976 | -144 | -144 | -145 | -146 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -154 | -156 | -158 | -160 | -159 | -156 | -152 | -148 | -146 | -142 | -130 | -113 | -108 | -109 |
| 201009 | LHN-10 | AR | 2880 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -154 | -155 | -156 | -157 | -158 | -160 | -162 | -163 | -161 | -158 | -155 | -152 | -149 | -145 | -136 | -124 | -113 | -111 |
| 201008 | LHN-10 | AR | 2976 | -147 | -147 | -149 | -149 | -150 | -151 | -152 | -153 | -155 | -155 | -156 | -157 | -159 | -160 | -163 | -164 | -164 | -161 | -160 | -159 | -156 | -151 | -146 | -142 | -137 | -126 |
| 201007 | LHN-10 | AR | 2976 | -147 | -147 | -148 | -149 | -150 | -151 | -152 | -154 | -155 | -157 | -157 | -158 | -159 | -161 | -163 | -165 | -165 | -162 | -160 | -159 | -157 | -151 | -145 | -140 | -134 | -128 |
| 201006 | LHN-10 | AR | 2303 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -155 | -156 | -157 | -159 | -161 | -163 | -163 | -160 | -159 | -157 | -153 | -149 | -143 | -136 | -125 | -119 |
| 201005 | LHN-10 | AR | 2976 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -153 | -154 | -155 | -156 | -157 | -159 | -161 | -163 | -163 | -161 | -159 | -154 | -152 | -149 | -142 | -128 | -122 | -122 |
| 201004 | LHN-10 | AR | 2880 | -143 | -143 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -153 | -154 | -155 | -157 | -159 | -161 | -162 | -160 | -157 | -152 | -150 | -147 | -141 | -124 | -115 | -112 |
| 201003 | LHN-10 | AR | 2941 | -143 | -144 | -145 | -145 | -146 | -146 | -148 | -148 | -150 | -151 | -152 | -153 | -155 | -156 | -157 | -160 | -159 | -155 | -153 | -150 | -149 | -143 | -132 | -117 | -109 | -110 |
| 201002 | LHN-10 | AR | 2688 | -143 | -144 | -145 | -145 | -146 | -147 | -148 | -149 | -149 | -150 | -152 | -153 | -155 | -156 | -157 | -159 | -157 | -153 | -150 | -147 | -146 | -138 | -120 | -113 | -111 | -113 |
| 201001 | LHN-10 | AR | 2970 | -144 | -144 | -145 | -146 | -147 | -147 | -148 | -150 | -150 | -151 | -152 | -154 | -155 | -156 | -157 | -159 | -158 | -153 | -147 | -145 | -146 | -133 | -117 | -112 | -111 | -113 |
| 200912 | LHN-10 | AR | 2976 | -145 | -145 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -152 | -154 | -154 | -156 | -157 | -158 | -157 | -152 | -147 | -145 | -145 | -132 | -118 | -111 | -110 | -112 |
| 200911 | LHN-10 | AR | 2880 | -143 | -144 | -145 | -145 | -146 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -155 | -156 | -157 | -157 | -154 | -149 | -146 | -146 | -141 | -123 | -110 | -106 | -106 |
| 200910 | LHN-10 | AR | 2909 | -143 | -144 | -145 | -145 | -146 | -147 | -148 | -148 | -150 | -151 | -152 | -153 | -155 | -156 | -158 | -159 | -158 | -155 | -152 | -148 | -147 | -143 | -127 | -115 | -108 | -109 |
| 200909 | LHN-10 | AR | 2880 | -144 | -145 | -146 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -154 | -156 | -158 | -160 | -162 | -162 | -159 | -157 | -153 | -150 | -149 | -143 | -130 | -118 | -113 |
| 200908 | LHN-10 | AR | 2976 | -146 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -154 | -155 | -156 | -158 | -160 | -162 | -164 | -163 | -160 | -159 | -159 | -155 | -148 | -142 | -139 | -129 | -122 |
| 200907 | LHN-10 | AR | 2966 | -144 | -145 | -146 | -146 | -148 | -149 | -150 | -151 | -152 | -153 | -155 | -156 | -157 | -159 | -160 | -163 | -163 | -161 | -160 | -159 | -156 | -153 | -147 | -140 | -129 | -122 |
| 200906 | LHN-10 | AR | 2878 | -145 | -145 | -146 | -147 | -149 | -150 | -151 | -152 | -153 | -155 | -156 | -157 | -158 | -160 | -162 | -164 | -164 | -161 | -161 | -161 | -158 | -153 | -148 | -144 | -138 | -133 |
| 200905 | LHN-10 | AR | 2976 | -142 | -142 | -143 | -144 | -144 | -145 | -147 | -148 | -149 | -150 | -152 | -153 | -154 | -156 | -158 | -160 | -161 | -158 | -157 | -156 | -153 | -148 | -141 | -130 | -120 | -115 |
| 200904 | LHN-10 | AR | 2880 | -144 | -144 | -145 | -146 | -147 | -148 | -149 | -151 | -152 | -153 | -154 | -155 | -156 | -158 | -159 | -161 | -162 | -159 | -156 | -152 | -150 | -146 | -137 | -124 | -115 | -111 |
| 200903 | LHN-10 | AR | 2976 | -142 | -143 | -143 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -153 | -154 | -155 | -157 | -159 | -159 | -155 | -150 | -147 | -147 | -142 | -121 | -109 | -105 | -105 |
| 200902 | LHN-10 | AR | 2688 | -143 | -144 | -144 | -146 | -146 | -147 | -148 | -149 | -151 | -151 | -152 | -154 | -155 | -156 | -157 | -160 | -159 | -155 | -149 | -146 | -146 | -137 | -118 | -107 | -107 | -107 |
| 200901 | LHN-10 | AR | 2974 | -144 | -144 | -145 | -145 | -146 | -147 | -148 | -149 | -149 | -150 | -151 | -152 | -154 | -155 | -157 | -158 | -157 | -152 | -147 | -145 | -145 | -132 | -118 | -109 | -106 | -108 |