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. | 518s | 439s | 373s | 316s | 268s | 228s | 193s | 164s | 139s | 118s | 100s | 85s | 72s | 61s | 52s | 44s | 37s | 32s | 27s | 23s | 19s | 16s | 14s | 12s | 10s |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 202601 | LHN-00 | AR | 620 | -147 | -149 | -150 | -150 | -152 | -155 | -158 | -161 | -163 | -165 | -167 | -168 | -169 | -169 | -169 | -169 | -168 | -168 | -167 | -164 | -158 | -152 | -147 | -144 | -141 |
| 202512 | LHN-00 | AR | 726 | -147 | -149 | -151 | -151 | -152 | -156 | -158 | -161 | -162 | -164 | -166 | -166 | -167 | -167 | -168 | -168 | -168 | -169 | -168 | -166 | -159 | -154 | -151 | -146 | -141 |
| 202511 | LHN-00 | AR | 713 | -147 | -149 | -150 | -150 | -151 | -153 | -155 | -157 | -158 | -159 | -160 | -161 | -161 | -162 | -162 | -163 | -163 | -163 | -164 | -163 | -158 | -152 | -147 | -142 | -138 |
| 202510 | LHN-00 | AR | 737 | -146 | -148 | -150 | -149 | -150 | -153 | -155 | -156 | -157 | -159 | -160 | -161 | -161 | -162 | -162 | -163 | -163 | -164 | -164 | -163 | -158 | -152 | -146 | -141 | -138 |
| 202509 | LHN-00 | AR | 718 | -145 | -147 | -148 | -148 | -148 | -152 | -154 | -156 | -158 | -159 | -160 | -161 | -162 | -162 | -163 | -162 | -163 | -163 | -162 | -161 | -155 | -147 | -141 | -137 | -136 |
| 202508 | LHN-00 | AR | 684 | -146 | -147 | -149 | -149 | -149 | -153 | -156 | -159 | -160 | -163 | -164 | -166 | -167 | -167 | -167 | -167 | -167 | -167 | -167 | -165 | -158 | -151 | -145 | -141 | -138 |
| 202507 | LHN-00 | AR | 744 | -143 | -145 | -146 | -147 | -147 | -151 | -154 | -156 | -158 | -160 | -161 | -162 | -162 | -163 | -163 | -163 | -163 | -164 | -163 | -161 | -154 | -147 | -143 | -139 | -138 |
| 202506 | LHN-00 | AR | 680 | -143 | -144 | -147 | -147 | -148 | -152 | -154 | -157 | -159 | -162 | -164 | -166 | -167 | -167 | -167 | -167 | -167 | -167 | -166 | -163 | -156 | -149 | -143 | -139 | -135 |
| 202505 | LHN-00 | AR | 714 | -144 | -146 | -149 | -149 | -149 | -153 | -156 | -158 | -159 | -161 | -162 | -164 | -164 | -164 | -164 | -164 | -164 | -165 | -164 | -162 | -156 | -150 | -144 | -141 | -136 |
| 202504 | LHN-00 | AR | 354 | -148 | -149 | -151 | -151 | -151 | -154 | -156 | -159 | -160 | -162 | -163 | -163 | -165 | -166 | -166 | -167 | -166 | -166 | -166 | -163 | -156 | -150 | -143 | -140 | -138 |
| 202503 | LHN-00 | AR | 742 | -148 | -151 | -152 | -152 | -152 | -155 | -158 | -161 | -163 | -165 | -168 | -169 | -171 | -171 | -170 | -169 | -169 | -168 | -167 | -163 | -156 | -149 | -143 | -139 | -138 |
| 202502 | LHN-00 | AR | 672 | -145 | -148 | -149 | -149 | -151 | -155 | -157 | -159 | -159 | -160 | -162 | -163 | -164 | -164 | -165 | -165 | -165 | -165 | -165 | -162 | -156 | -149 | -144 | -141 | -140 |
| 202501 | LHN-00 | AR | 744 | -147 | -148 | -150 | -150 | -151 | -154 | -156 | -157 | -158 | -160 | -161 | -162 | -162 | -162 | -163 | -163 | -164 | -164 | -164 | -162 | -157 | -151 | -147 | -143 | -140 |