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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 201106 | LHN-00 | AR | 205 | -126 | -126 | -127 | -129 | -130 | -131 | -133 | -134 | -136 | -137 | -139 | -141 | -142 | -144 | -145 | -147 | -148 | -148 | -150 | -151 | -148 |
| 201105 | LHN-00 | AR | 445 | -125 | -126 | -128 | -129 | -131 | -132 | -133 | -135 | -136 | -138 | -139 | -141 | -142 | -144 | -146 | -147 | -149 | -149 | -150 | -150 | -150 |
| 201104 | LHN-00 | AR | 688 | -125 | -127 | -128 | -129 | -131 | -132 | -134 | -135 | -137 | -138 | -140 | -141 | -143 | -145 | -146 | -148 | -149 | -148 | -148 | -149 | -147 |
| 201103 | LHN-00 | AR | 742 | -126 | -127 | -128 | -130 | -131 | -133 | -134 | -136 | -137 | -139 | -140 | -142 | -143 | -145 | -146 | -148 | -149 | -148 | -146 | -146 | -144 |
| 201102 | LHN-00 | AR | 254 | -128 | -129 | -130 | -132 | -133 | -134 | -136 | -137 | -139 | -140 | -141 | -143 | -145 | -146 | -148 | -150 | -150 | -147 | -145 | -145 | -144 |
| 201101 | LHN-00 | AR | 743 | -127 | -128 | -129 | -131 | -132 | -134 | -135 | -137 | -138 | -140 | -141 | -143 | -145 | -146 | -148 | -149 | -149 | -146 | -144 | -144 | -141 |
| 201012 | LHN-00 | AR | 744 | -129 | -130 | -131 | -132 | -134 | -135 | -137 | -138 | -139 | -141 | -143 | -144 | -146 | -148 | -149 | -151 | -152 | -149 | -146 | -144 | -145 |
| 201011 | LHN-00 | AR | 720 | -129 | -130 | -132 | -133 | -134 | -136 | -137 | -139 | -140 | -142 | -144 | -145 | -147 | -149 | -150 | -152 | -151 | -149 | -145 | -144 | -143 |
| 201010 | LHN-00 | AR | 737 | -130 | -131 | -133 | -134 | -135 | -137 | -138 | -140 | -141 | -143 | -144 | -146 | -148 | -150 | -151 | -152 | -152 | -150 | -148 | -146 | -145 |
| 201009 | LHN-00 | AR | 720 | -130 | -131 | -132 | -134 | -135 | -136 | -138 | -140 | -141 | -143 | -145 | -146 | -148 | -150 | -152 | -153 | -152 | -151 | -150 | -150 | -149 |
| 201008 | LHN-00 | AR | 359 | -131 | -132 | -133 | -135 | -136 | -138 | -139 | -141 | -142 | -144 | -146 | -148 | -149 | -151 | -153 | -154 | -153 | -151 | -152 | -154 | -148 |
| 201007 | LHN-00 | AR | 697 | -135 | -136 | -137 | -139 | -141 | -142 | -143 | -145 | -147 | -148 | -150 | -151 | -153 | -155 | -156 | -157 | -156 | -153 | -153 | -155 | -150 |
| 201006 | LHN-00 | AR | 720 | -137 | -138 | -140 | -141 | -143 | -144 | -146 | -147 | -149 | -151 | -152 | -154 | -156 | -157 | -159 | -160 | -157 | -154 | -154 | -155 | -150 |
| 201005 | LHN-00 | AR | 744 | -139 | -140 | -142 | -143 | -145 | -146 | -148 | -150 | -151 | -153 | -155 | -157 | -158 | -160 | -161 | -162 | -158 | -154 | -154 | -154 | -148 |
| 201004 | LHN-00 | AR | 694 | -141 | -143 | -144 | -146 | -147 | -149 | -151 | -152 | -154 | -156 | -157 | -159 | -160 | -162 | -163 | -163 | -157 | -151 | -149 | -148 | -144 |
| 201003 | LHN-00 | AR | 735 | -142 | -144 | -146 | -147 | -149 | -150 | -152 | -154 | -155 | -157 | -159 | -160 | -162 | -163 | -163 | -162 | -155 | -149 | -146 | -146 | -141 |
| 201002 | LHN-00 | AR | 502 | -143 | -144 | -146 | -148 | -149 | -151 | -153 | -155 | -157 | -158 | -160 | -162 | -163 | -164 | -164 | -163 | -156 | -151 | -146 | -144 | -144 |
| 201001 | LHN-00 | AR | 677 | -144 | -145 | -147 | -149 | -151 | -153 | -155 | -156 | -158 | -160 | -162 | -163 | -165 | -165 | -165 | -162 | -155 | -148 | -143 | -142 | -142 |
| 200912 | LHN-00 | AR | 713 | -148 | -150 | -151 | -153 | -155 | -156 | -158 | -160 | -162 | -164 | -165 | -166 | -167 | -168 | -167 | -163 | -156 | -148 | -144 | -143 | -142 |
| 200911 | LHN-00 | AR | 694 | -149 | -151 | -152 | -154 | -156 | -158 | -159 | -161 | -163 | -164 | -166 | -167 | -168 | -168 | -168 | -166 | -159 | -151 | -146 | -144 | -144 |
| 200910 | LHN-00 | AR | 712 | -151 | -153 | -154 | -156 | -158 | -159 | -161 | -163 | -164 | -166 | -167 | -169 | -169 | -169 | -168 | -165 | -157 | -152 | -150 | -149 | -145 |
| 200909 | LHN-00 | AR | 691 | -154 | -155 | -157 | -159 | -161 | -162 | -164 | -166 | -167 | -169 | -170 | -172 | -173 | -173 | -172 | -169 | -162 | -158 | -156 | -152 | -150 |
| 200908 | LHN-00 | AR | 423 | -158 | -159 | -161 | -162 | -164 | -166 | -167 | -169 | -170 | -172 | -174 | -174 | -175 | -174 | -173 | -170 | -163 | -156 | -156 | -157 | -153 |
| 200906 | LHN-00 | AR | 160 | -159 | -161 | -163 | -165 | -166 | -168 | -170 | -171 | -173 | -174 | -176 | -177 | -176 | -176 | -174 | -171 | -164 | -158 | -156 | -158 | -155 |
| 200905 | LHN-00 | AR | 599 | -159 | -161 | -162 | -164 | -165 | -167 | -169 | -170 | -172 | -174 | -175 | -176 | -176 | -175 | -173 | -170 | -163 | -157 | -156 | -157 | -155 |
| 200904 | LHN-00 | AR | 694 | -157 | -158 | -160 | -162 | -164 | -166 | -167 | -169 | -171 | -172 | -174 | -175 | -175 | -174 | -172 | -169 | -161 | -156 | -155 | -154 | -148 |
| 200903 | LHN-00 | AR | 701 | -156 | -157 | -159 | -161 | -163 | -165 | -167 | -169 | -171 | -172 | -174 | -175 | -174 | -173 | -172 | -169 | -162 | -155 | -150 | -150 | -150 |
| 200902 | LHN-00 | AR | 669 | -155 | -157 | -159 | -161 | -163 | -164 | -166 | -169 | -170 | -172 | -174 | -175 | -174 | -173 | -171 | -168 | -159 | -153 | -150 | -150 | -145 |
| 200901 | LHN-00 | AR | 720 | -152 | -154 | -156 | -158 | -160 | -162 | -165 | -166 | -169 | -171 | -172 | -173 | -173 | -172 | -171 | -168 | -160 | -154 | -149 | -149 | -147 |
| 200812 | LHN-00 | AR | 742 | -154 | -156 | -157 | -159 | -161 | -163 | -165 | -167 | -169 | -171 | -173 | -174 | -173 | -173 | -171 | -168 | -160 | -153 | -150 | -149 | -146 |
| 200811 | LHN-00 | AR | 648 | -154 | -156 | -158 | -160 | -162 | -164 | -166 | -168 | -169 | -171 | -173 | -173 | -173 | -172 | -170 | -168 | -160 | -153 | -148 | -146 | -146 |
| 200810 | LHN-00 | AR | 732 | -174 | -174 | -175 | -174 | -174 | -174 | -171 | -169 | -171 | -170 | -169 | -167 | -167 | -168 | -167 | -167 | -167 | -167 | -166 | -165 | -164 |
| 200809 | LHN-00 | AR | 495 | -183 | -183 | -182 | -181 | -180 | -180 | -179 | -178 | -178 | -177 | -176 | -176 | -175 | -174 | -174 | -173 | -173 | -172 | -171 | -171 | -170 |
| 200808 | LHN-00 | AR | 95 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |