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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 202003 | LHN-10 | AR | 17 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |
| 202002 | LHN-10 | AR | 664 | -132 | -133 | -135 | -137 | -137 | -138 | -139 | -140 | -141 | -142 | -143 | -145 | -145 | -146 | -147 | -148 | -149 | -149 | -150 | -150 | -150 | -147 | -147 | -147 | -146 |
| 202001 | LHN-10 | AR | 729 | -131 | -132 | -132 | -134 | -135 | -136 | -137 | -138 | -138 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -148 | -149 | -148 | -147 | -146 | -146 | -146 |
| 201912 | LHN-10 | AR | 693 | -129 | -130 | -132 | -132 | -134 | -135 | -137 | -138 | -139 | -140 | -142 | -143 | -144 | -145 | -146 | -147 | -149 | -149 | -150 | -151 | -151 | -148 | -147 | -146 | -145 |
| 201911 | LHN-10 | AR | 615 | -130 | -131 | -132 | -133 | -134 | -136 | -137 | -138 | -139 | -140 | -141 | -143 | -143 | -145 | -146 | -146 | -147 | -148 | -149 | -150 | -150 | -148 | -147 | -146 | -145 |
| 201910 | LHN-10 | AR | 739 | -129 | -131 | -132 | -133 | -135 | -136 | -137 | -138 | -139 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -148 | -150 | -151 | -152 | -151 | -150 | -149 | -147 | -146 |
| 201909 | LHN-10 | AR | 717 | -127 | -129 | -130 | -132 | -133 | -134 | -135 | -137 | -138 | -139 | -140 | -141 | -142 | -144 | -145 | -145 | -147 | -148 | -149 | -150 | -151 | -149 | -148 | -147 | -146 |
| 201908 | LHN-10 | AR | 674 | -136 | -138 | -140 | -140 | -141 | -143 | -143 | -144 | -145 | -146 | -147 | -147 | -148 | -149 | -149 | -150 | -151 | -152 | -152 | -153 | -153 | -151 | -150 | -148 | -146 |
| 201907 | LHN-10 | AR | 744 | -136 | -138 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -147 | -148 | -150 | -150 | -151 | -152 | -153 | -154 | -155 | -155 | -154 | -151 | -150 | -148 | -147 |
| 201906 | LHN-10 | AR | 696 | -139 | -141 | -142 | -145 | -146 | -147 | -148 | -149 | -150 | -150 | -151 | -151 | -152 | -153 | -154 | -155 | -156 | -156 | -157 | -158 | -156 | -153 | -152 | -149 | -148 |
| 201905 | LHN-10 | AR | 744 | -139 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -151 | -153 | -153 | -153 | -154 | -155 | -156 | -156 | -154 | -152 | -150 | -147 | -146 |
| 201904 | LHN-10 | AR | 720 | -138 | -139 | -140 | -141 | -142 | -143 | -143 | -145 | -146 | -146 | -148 | -148 | -150 | -150 | -151 | -152 | -153 | -153 | -154 | -155 | -153 | -150 | -148 | -147 | -146 |
| 201903 | LHN-10 | AR | 744 | -139 | -140 | -143 | -144 | -146 | -147 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -153 | -154 | -155 | -156 | -156 | -157 | -156 | -154 | -151 | -150 | -148 | -147 |
| 201902 | LHN-10 | AR | 428 | -132 | -133 | -136 | -137 | -139 | -140 | -141 | -143 | -144 | -145 | -147 | -148 | -150 | -151 | -152 | -153 | -154 | -154 | -154 | -154 | -151 | -148 | -146 | -146 | -146 |
| 201901 | LHN-10 | AR | 369 | -138 | -140 | -141 | -142 | -143 | -144 | -145 | -145 | -146 | -147 | -149 | -149 | -151 | -152 | -154 | -155 | -157 | -158 | -158 | -159 | -155 | -152 | -149 | -147 | -147 |
| 201812 | LHN-10 | AR | 553 | -138 | -139 | -141 | -143 | -144 | -145 | -146 | -148 | -149 | -150 | -151 | -152 | -154 | -155 | -157 | -158 | -158 | -159 | -160 | -158 | -155 | -151 | -148 | -146 | -146 |
| 201811 | LHN-10 | AR | 709 | -138 | -140 | -142 | -143 | -144 | -146 | -147 | -148 | -149 | -150 | -152 | -153 | -156 | -157 | -158 | -159 | -160 | -160 | -161 | -160 | -155 | -150 | -147 | -147 | -146 |
| 201810 | LHN-10 | AR | 329 | -138 | -141 | -143 | -144 | -146 | -147 | -149 | -150 | -151 | -153 | -154 | -156 | -158 | -160 | -161 | -162 | -163 | -164 | -163 | -161 | -158 | -153 | -149 | -147 | -147 |
| 201807 | LHN-10 | AR | 39 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |
| 201806 | LHN-10 | AR | 710 | -138 | -141 | -143 | -145 | -146 | -147 | -149 | -150 | -151 | -152 | -153 | -154 | -156 | -157 | -157 | -158 | -159 | -160 | -161 | -161 | -158 | -154 | -151 | -149 | -148 |
| 201805 | LHN-10 | AR | 738 | -138 | -140 | -142 | -143 | -144 | -146 | -147 | -147 | -148 | -149 | -151 | -151 | -152 | -153 | -153 | -154 | -155 | -155 | -156 | -157 | -155 | -152 | -150 | -148 | -147 |
| 201804 | LHN-10 | AR | 681 | -137 | -139 | -141 | -142 | -142 | -143 | -144 | -145 | -146 | -147 | -148 | -148 | -149 | -150 | -151 | -152 | -152 | -153 | -153 | -153 | -152 | -149 | -148 | -146 | -145 |
| 201803 | LHN-10 | AR | 432 | -139 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -148 | -150 | -151 | -152 | -154 | -154 | -155 | -156 | -157 | -157 | -158 | -157 | -155 | -151 | -149 | -147 | -147 |