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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 202501 | LHN-00 | AR | 202 | -103 | -109 | -111 | -113 | -118 | -121 | -120 | -120 | -125 | -128 | -129 | -131 | -133 | -134 | -137 | -138 | -139 | -140 | -142 | -142 | -141 | -139 | -139 | -138 | -134 |
| 202412 | LHN-00 | AR | 326 | -99 | -106 | -110 | -112 | -115 | -118 | -119 | -119 | -123 | -126 | -126 | -128 | -128 | -130 | -134 | -133 | -134 | -136 | -137 | -137 | -138 | -137 | -135 | -134 | -133 |
| 202411 | LHN-00 | AR | 605 | -137 | -137 | -140 | -142 | -143 | -144 | -144 | -146 | -148 | -149 | -150 | -151 | -151 | -151 | -150 | -150 | -149 | -148 | -147 | -146 | -145 | -143 | -141 | -141 | -139 |
| 202410 | LHN-00 | AR | 731 | -141 | -142 | -143 | -143 | -144 | -143 | -143 | -145 | -146 | -148 | -150 | -151 | -152 | -155 | -157 | -159 | -160 | -160 | -160 | -157 | -148 | -142 | -139 | -139 | -138 |
| 202409 | LHN-00 | AR | 720 | -142 | -142 | -142 | -143 | -143 | -142 | -141 | -143 | -145 | -146 | -148 | -150 | -151 | -152 | -153 | -154 | -156 | -158 | -158 | -154 | -148 | -138 | -136 | -139 | -136 |
| 202408 | LHN-00 | AR | 191 | -140 | -142 | -142 | -142 | -141 | -141 | -140 | -141 | -142 | -144 | -146 | -148 | -150 | -153 | -153 | -155 | -157 | -158 | -158 | -158 | -150 | -140 | -139 | -134 | -134 |
| 202405 | LHN-00 | AR | 504 | -141 | -141 | -142 | -143 | -142 | -141 | -140 | -142 | -144 | -145 | -148 | -150 | -153 | -156 | -158 | -160 | -160 | -160 | -159 | -156 | -147 | -137 | -134 | -135 | -135 |
| 202404 | LHN-00 | AR | 671 | -143 | -143 | -143 | -144 | -144 | -142 | -141 | -143 | -145 | -146 | -149 | -152 | -154 | -156 | -159 | -161 | -161 | -160 | -159 | -156 | -146 | -136 | -134 | -136 | -137 |
| 202403 | LHN-00 | AR | 602 | -143 | -144 | -144 | -144 | -144 | -142 | -141 | -144 | -145 | -147 | -150 | -153 | -155 | -158 | -160 | -161 | -161 | -160 | -159 | -155 | -146 | -139 | -139 | -138 | -136 |
| 202402 | LHN-00 | AR | 215 | -144 | -144 | -144 | -144 | -143 | -142 | -141 | -143 | -145 | -147 | -150 | -152 | -156 | -158 | -161 | -162 | -162 | -161 | -160 | -157 | -147 | -139 | -136 | -135 | -135 |
| 202309 | LHN-00 | AR | 353 | -141 | -142 | -142 | -142 | -142 | -141 | -141 | -142 | -143 | -144 | -146 | -148 | -150 | -152 | -153 | -155 | -157 | -158 | -159 | -154 | -148 | -138 | -136 | -135 | -136 |
| 202308 | LHN-00 | AR | 311 | -139 | -140 | -141 | -141 | -141 | -140 | -140 | -142 | -142 | -143 | -147 | -149 | -154 | -156 | -158 | -160 | -161 | -161 | -160 | -156 | -144 | -134 | -134 | -135 | -132 |
| 202307 | LHN-00 | AR | 725 | -140 | -140 | -141 | -142 | -142 | -141 | -141 | -142 | -144 | -145 | -147 | -150 | -152 | -154 | -155 | -157 | -159 | -159 | -159 | -156 | -148 | -139 | -137 | -135 | -134 |
| 202306 | LHN-00 | AR | 718 | -140 | -141 | -142 | -143 | -142 | -142 | -141 | -143 | -144 | -146 | -148 | -151 | -153 | -155 | -158 | -160 | -161 | -161 | -160 | -158 | -150 | -140 | -137 | -135 | -136 |
| 202305 | LHN-00 | AR | 740 | -139 | -139 | -141 | -141 | -140 | -139 | -138 | -140 | -143 | -144 | -147 | -149 | -153 | -155 | -158 | -160 | -160 | -160 | -159 | -156 | -147 | -137 | -134 | -134 | -133 |
| 202304 | LHN-00 | AR | 662 | -143 | -144 | -145 | -145 | -145 | -144 | -142 | -145 | -146 | -148 | -150 | -152 | -156 | -158 | -160 | -162 | -162 | -161 | -160 | -157 | -150 | -140 | -137 | -136 | -137 |
| 202303 | LHN-00 | AR | 636 | -143 | -144 | -144 | -144 | -144 | -143 | -143 | -144 | -147 | -149 | -152 | -154 | -156 | -159 | -161 | -162 | -162 | -160 | -160 | -158 | -149 | -140 | -138 | -138 | -136 |
| 202302 | LHN-00 | AR | 661 | -144 | -144 | -145 | -145 | -144 | -143 | -143 | -146 | -148 | -150 | -153 | -155 | -157 | -159 | -161 | -162 | -162 | -161 | -160 | -157 | -149 | -141 | -139 | -139 | -137 |
| 202301 | LHN-00 | AR | 739 | -142 | -141 | -142 | -143 | -142 | -141 | -141 | -144 | -146 | -148 | -151 | -152 | -155 | -158 | -159 | -161 | -161 | -160 | -159 | -156 | -147 | -139 | -137 | -137 | -135 |
| 202212 | LHN-00 | AR | 442 | -143 | -143 | -144 | -144 | -143 | -142 | -142 | -145 | -147 | -150 | -152 | -154 | -157 | -159 | -161 | -162 | -162 | -162 | -161 | -158 | -149 | -140 | -139 | -138 | -136 |
| 202211 | LHN-00 | AR | 697 | -142 | -143 | -144 | -145 | -144 | -143 | -143 | -145 | -146 | -148 | -151 | -154 | -156 | -158 | -160 | -162 | -162 | -162 | -162 | -159 | -150 | -141 | -138 | -138 | -138 |
| 202210 | LHN-00 | AR | 722 | -141 | -142 | -142 | -142 | -142 | -141 | -140 | -142 | -144 | -145 | -148 | -151 | -154 | -157 | -159 | -161 | -161 | -161 | -160 | -157 | -146 | -135 | -134 | -136 | -136 |
| 202209 | LHN-00 | AR | 720 | -141 | -141 | -142 | -142 | -141 | -141 | -141 | -142 | -144 | -145 | -147 | -149 | -151 | -153 | -155 | -157 | -158 | -158 | -157 | -154 | -145 | -135 | -136 | -138 | -136 |
| 202208 | LHN-00 | AR | 718 | -142 | -141 | -143 | -144 | -143 | -143 | -142 | -144 | -146 | -147 | -149 | -151 | -153 | -156 | -158 | -159 | -161 | -161 | -160 | -158 | -150 | -141 | -139 | -138 | -137 |
| 202207 | LHN-00 | AR | 627 | -140 | -140 | -141 | -141 | -142 | -141 | -140 | -142 | -142 | -144 | -145 | -147 | -149 | -151 | -153 | -155 | -156 | -157 | -157 | -154 | -147 | -139 | -137 | -135 | -134 |
| 202206 | LHN-00 | AR | 682 | -142 | -142 | -143 | -143 | -144 | -143 | -142 | -144 | -145 | -147 | -149 | -152 | -154 | -157 | -159 | -161 | -162 | -162 | -161 | -158 | -150 | -141 | -137 | -137 | -137 |
| 202205 | LHN-00 | AR | 744 | -140 | -140 | -141 | -141 | -141 | -140 | -139 | -141 | -143 | -144 | -147 | -150 | -153 | -156 | -159 | -160 | -160 | -160 | -159 | -155 | -145 | -135 | -133 | -134 | -135 |
| 202204 | LHN-00 | AR | 716 | -140 | -141 | -141 | -142 | -141 | -141 | -140 | -142 | -144 | -146 | -148 | -151 | -154 | -156 | -158 | -160 | -160 | -159 | -158 | -155 | -145 | -135 | -134 | -136 | -136 |
| 202203 | LHN-00 | AR | 744 | -142 | -143 | -143 | -143 | -143 | -142 | -141 | -143 | -145 | -147 | -150 | -152 | -155 | -158 | -160 | -161 | -160 | -159 | -158 | -155 | -147 | -137 | -135 | -135 | -136 |
| 202202 | LHN-00 | AR | 537 | -143 | -143 | -144 | -144 | -143 | -143 | -142 | -145 | -147 | -149 | -152 | -153 | -156 | -159 | -161 | -162 | -161 | -160 | -160 | -156 | -149 | -140 | -137 | -137 | -136 |
| 202201 | LHN-00 | AR | 524 | -142 | -142 | -142 | -143 | -142 | -141 | -140 | -143 | -144 | -146 | -149 | -151 | -155 | -158 | -159 | -161 | -160 | -160 | -158 | -156 | -148 | -140 | -137 | -135 | -134 |
| 202112 | LHN-00 | AR | 180 | -142 | -142 | -143 | -143 | -143 | -142 | -142 | -143 | -145 | -147 | -150 | -152 | -155 | -157 | -160 | -161 | -162 | -161 | -161 | -158 | -149 | -139 | -136 | -136 | -136 |
| 202111 | LHN-00 | AR | 712 | -141 | -142 | -143 | -144 | -144 | -144 | -143 | -146 | -147 | -148 | -151 | -154 | -156 | -159 | -161 | -162 | -162 | -162 | -161 | -160 | -154 | -145 | -141 | -138 | -138 |
| 202110 | LHN-00 | AR | 744 | -142 | -143 | -144 | -144 | -143 | -143 | -141 | -144 | -145 | -147 | -149 | -151 | -153 | -155 | -157 | -159 | -159 | -160 | -160 | -158 | -150 | -141 | -139 | -138 | -137 |
| 202109 | LHN-00 | AR | 720 | -141 | -141 | -142 | -142 | -142 | -141 | -140 | -143 | -144 | -145 | -147 | -150 | -152 | -155 | -156 | -158 | -159 | -159 | -158 | -154 | -146 | -137 | -136 | -136 | -136 |
| 202108 | LHN-00 | AR | 744 | -139 | -140 | -140 | -141 | -141 | -140 | -139 | -141 | -143 | -144 | -147 | -149 | -151 | -153 | -155 | -156 | -157 | -158 | -158 | -154 | -146 | -138 | -135 | -135 | -135 |
| 202107 | LHN-00 | AR | 744 | -141 | -141 | -142 | -143 | -143 | -143 | -142 | -144 | -146 | -147 | -149 | -151 | -153 | -155 | -157 | -159 | -159 | -159 | -159 | -156 | -147 | -138 | -138 | -137 | -137 |
| 202106 | LHN-00 | AR | 720 | -140 | -141 | -141 | -141 | -141 | -141 | -140 | -142 | -144 | -145 | -148 | -150 | -153 | -156 | -158 | -159 | -161 | -161 | -160 | -155 | -145 | -136 | -134 | -135 | -136 |
| 202105 | LHN-00 | AR | 267 | -139 | -138 | -139 | -140 | -140 | -138 | -136 | -139 | -141 | -143 | -146 | -150 | -152 | -156 | -158 | -160 | -161 | -161 | -159 | -155 | -145 | -134 | -132 | -133 | -133 |
| 202104 | LHN-00 | AR | 712 | -141 | -141 | -142 | -143 | -142 | -142 | -141 | -144 | -146 | -148 | -151 | -152 | -156 | -158 | -160 | -162 | -162 | -161 | -159 | -154 | -145 | -136 | -136 | -138 | -137 |
| 202103 | LHN-00 | AR | 623 | -142 | -143 | -143 | -143 | -143 | -142 | -141 | -144 | -145 | -147 | -151 | -153 | -156 | -158 | -160 | -161 | -161 | -160 | -159 | -156 | -148 | -138 | -135 | -134 | -134 |