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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 202504 | LHN-10 | AR | 662 | -135 | -135 | -137 | -138 | -139 | -141 | -142 | -144 | -145 | -147 | -148 | -149 | -151 | -152 | -153 | -154 | -155 | -156 | -157 | -157 | -153 | -147 | -145 | -146 | -144 |
| 202503 | LHN-10 | AR | 742 | -135 | -136 | -138 | -139 | -141 | -142 | -144 | -145 | -147 | -148 | -149 | -150 | -152 | -153 | -154 | -155 | -156 | -157 | -158 | -157 | -152 | -146 | -142 | -140 | -141 |
| 202502 | LHN-10 | AR | 672 | -136 | -137 | -138 | -139 | -141 | -143 | -144 | -145 | -147 | -148 | -149 | -151 | -152 | -153 | -154 | -155 | -156 | -157 | -158 | -158 | -154 | -148 | -144 | -143 | -144 |
| 202501 | LHN-10 | AR | 744 | -137 | -138 | -139 | -140 | -141 | -142 | -144 | -145 | -147 | -148 | -149 | -151 | -152 | -153 | -154 | -155 | -156 | -157 | -158 | -158 | -155 | -151 | -148 | -149 | -146 |
| 202412 | LHN-10 | AR | 738 | -133 | -135 | -136 | -136 | -138 | -139 | -140 | -141 | -143 | -144 | -146 | -147 | -149 | -150 | -151 | -152 | -154 | -155 | -156 | -154 | -154 | -153 | -153 | -155 | -151 |
| 202411 | LHN-10 | AR | 720 | -132 | -132 | -133 | -134 | -134 | -135 | -136 | -137 | -138 | -140 | -141 | -142 | -143 | -145 | -146 | -148 | -149 | -150 | -151 | -152 | -153 | -153 | -153 | -155 | -153 |
| 202410 | LHN-10 | AR | 717 | -135 | -135 | -136 | -137 | -137 | -138 | -140 | -140 | -142 | -143 | -144 | -145 | -146 | -147 | -149 | -149 | -150 | -152 | -153 | -154 | -154 | -153 | -154 | -156 | -154 |
| 202409 | LHN-10 | AR | 720 | -135 | -136 | -136 | -137 | -138 | -139 | -139 | -140 | -141 | -142 | -143 | -144 | -146 | -146 | -147 | -148 | -150 | -151 | -152 | -154 | -155 | -154 | -153 | -156 | -154 |
| 202408 | LHN-10 | AR | 715 | -132 | -133 | -134 | -135 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -143 | -144 | -145 | -146 | -147 | -148 | -150 | -152 | -153 | -153 | -152 | -153 | -156 | -150 |
| 202407 | LHN-10 | AR | 744 | -129 | -129 | -130 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -139 | -140 | -141 | -143 | -144 | -145 | -147 | -148 | -150 | -151 | -152 | -151 | -152 | -154 | -150 |
| 202406 | LHN-10 | AR | 720 | -132 | -133 | -134 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -142 | -144 | -145 | -146 | -147 | -149 | -150 | -151 | -152 | -153 | -153 | -152 | -153 | -155 | -149 |
| 202405 | LHN-10 | AR | 708 | -137 | -137 | -138 | -139 | -140 | -141 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -155 | -155 | -153 | -152 | -154 | -144 |
| 202404 | LHN-10 | AR | 720 | -136 | -137 | -139 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -154 | -155 | -155 | -152 | -150 | -152 | -150 |
| 202403 | LHN-10 | AR | 742 | -137 | -138 | -139 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -154 | -154 | -152 | -147 | -143 | -142 | -141 |
| 202402 | LHN-10 | AR | 694 | -136 | -137 | -138 | -138 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -153 | -152 | -149 | -146 | -144 | -143 |
| 202401 | LHN-10 | AR | 743 | -133 | -133 | -134 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -143 | -144 | -145 | -146 | -148 | -148 | -150 | -151 | -152 | -152 | -152 | -150 | -148 | -147 | -146 |
| 202312 | LHN-10 | AR | 695 | -134 | -134 | -135 | -135 | -136 | -137 | -138 | -138 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -148 | -150 | -151 | -152 | -152 | -150 | -150 | -152 | -149 |
| 202311 | LHN-10 | AR | 670 | -136 | -136 | -137 | -138 | -138 | -139 | -140 | -140 | -141 | -143 | -143 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -151 | -152 | -152 | -153 | -155 | -154 |
| 202310 | LHN-10 | AR | 729 | -136 | -137 | -137 | -138 | -139 | -140 | -140 | -141 | -142 | -143 | -144 | -144 | -145 | -146 | -147 | -148 | -149 | -149 | -150 | -151 | -151 | -151 | -152 | -154 | -151 |
| 202309 | LHN-10 | AR | 713 | -136 | -137 | -137 | -138 | -138 | -139 | -140 | -141 | -142 | -143 | -143 | -144 | -145 | -146 | -147 | -148 | -148 | -149 | -150 | -151 | -151 | -151 | -151 | -154 | -151 |
| 202308 | LHN-10 | AR | 492 | -134 | -135 | -135 | -137 | -137 | -138 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -149 | -150 | -152 | -153 | -154 | -154 | -152 | -152 | -154 | -148 |
| 202307 | LHN-10 | AR | 743 | -135 | -137 | -137 | -137 | -138 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -148 | -149 | -150 | -152 | -153 | -154 | -156 | -157 | -157 | -153 | -152 | -154 | -149 |
| 202306 | LHN-10 | AR | 718 | -136 | -138 | -139 | -139 | -140 | -141 | -142 | -143 | -145 | -146 | -147 | -148 | -149 | -150 | -151 | -153 | -154 | -156 | -157 | -158 | -158 | -155 | -153 | -156 | -153 |
| 202305 | LHN-10 | AR | 742 | -138 | -137 | -138 | -138 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -149 | -150 | -151 | -153 | -155 | -156 | -157 | -156 | -152 | -151 | -151 | -146 |
| 202304 | LHN-10 | AR | 716 | -137 | -137 | -138 | -138 | -139 | -140 | -140 | -141 | -142 | -144 | -145 | -146 | -147 | -148 | -149 | -151 | -153 | -154 | -156 | -156 | -154 | -149 | -145 | -145 | -144 |
| 202303 | LHN-10 | AR | 744 | -137 | -138 | -138 | -139 | -140 | -140 | -142 | -142 | -143 | -145 | -145 | -147 | -148 | -149 | -150 | -152 | -153 | -155 | -156 | -156 | -154 | -149 | -144 | -142 | -143 |
| 202302 | LHN-10 | AR | 667 | -137 | -139 | -139 | -140 | -140 | -141 | -142 | -143 | -144 | -146 | -147 | -148 | -149 | -151 | -152 | -153 | -155 | -156 | -157 | -157 | -153 | -148 | -146 | -145 | -142 |
| 202301 | LHN-10 | AR | 744 | -137 | -138 | -138 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -148 | -149 | -150 | -151 | -153 | -154 | -156 | -157 | -157 | -156 | -151 | -147 | -146 | -146 |
| 202212 | LHN-10 | AR | 734 | -131 | -132 | -132 | -133 | -134 | -134 | -135 | -136 | -137 | -137 | -138 | -139 | -139 | -140 | -141 | -142 | -142 | -143 | -145 | -146 | -146 | -147 | -147 | -148 | -148 |
| 202211 | LHN-10 | AR | 718 | -131 | -131 | -131 | -133 | -133 | -133 | -133 | -135 | -135 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -141 | -142 | -143 | -145 | -145 | -146 | -146 | -148 | -148 |
| 202210 | LHN-10 | AR | 744 | -131 | -131 | -132 | -132 | -132 | -134 | -134 | -134 | -135 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -141 | -142 | -143 | -144 | -145 | -146 | -146 | -148 | -148 |
| 202209 | LHN-10 | AR | 714 | -131 | -132 | -132 | -132 | -133 | -134 | -134 | -135 | -135 | -136 | -137 | -138 | -138 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -147 | -149 | -149 |
| 202208 | LHN-10 | AR | 718 | -131 | -132 | -131 | -132 | -133 | -133 | -134 | -135 | -136 | -136 | -137 | -138 | -139 | -140 | -141 | -142 | -143 | -144 | -144 | -146 | -147 | -147 | -148 | -150 | -150 |
| 202207 | LHN-10 | AR | 714 | -131 | -132 | -133 | -133 | -134 | -134 | -135 | -136 | -136 | -137 | -138 | -139 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -147 | -148 | -150 | -147 |
| 202206 | LHN-10 | AR | 720 | -131 | -132 | -133 | -134 | -134 | -135 | -135 | -136 | -137 | -137 | -138 | -139 | -140 | -140 | -141 | -142 | -144 | -145 | -146 | -147 | -148 | -148 | -149 | -151 | -150 |
| 202205 | LHN-10 | AR | 744 | -101 | -103 | -103 | -104 | -105 | -106 | -107 | -107 | -108 | -109 | -110 | -110 | -111 | -112 | -113 | -114 | -115 | -116 | -117 | -118 | -119 | -119 | -119 | -121 | -120 |
| 202204 | LHN-10 | AR | 708 | -101 | -101 | -103 | -104 | -105 | -106 | -106 | -107 | -107 | -108 | -109 | -109 | -110 | -111 | -113 | -114 | -115 | -116 | -117 | -118 | -119 | -118 | -117 | -119 | -116 |
| 202203 | LHN-10 | AR | 744 | -100 | -102 | -103 | -104 | -105 | -106 | -107 | -108 | -108 | -109 | -110 | -110 | -111 | -112 | -113 | -114 | -115 | -116 | -117 | -118 | -118 | -116 | -113 | -112 | -113 |
| 202202 | LHN-10 | AR | 672 | -104 | -104 | -106 | -106 | -107 | -108 | -108 | -109 | -110 | -111 | -111 | -112 | -113 | -113 | -114 | -115 | -116 | -117 | -117 | -118 | -118 | -117 | -114 | -114 | -113 |
| 202201 | LHN-10 | AR | 303 | -104 | -106 | -107 | -107 | -107 | -108 | -109 | -109 | -110 | -111 | -112 | -112 | -113 | -114 | -115 | -116 | -118 | -119 | -120 | -121 | -121 | -119 | -116 | -115 | -116 |
| 202112 | LHN-10 | AR | 514 | -132 | -133 | -133 | -134 | -134 | -135 | -135 | -136 | -137 | -138 | -140 | -141 | -142 | -143 | -145 | -147 | -149 | -152 | -154 | -156 | -156 | -152 | -150 | -154 | -153 |
| 202111 | LHN-10 | AR | 719 | -132 | -132 | -132 | -133 | -133 | -134 | -135 | -136 | -137 | -138 | -140 | -141 | -142 | -144 | -145 | -147 | -149 | -152 | -154 | -156 | -157 | -155 | -154 | -156 | -157 |
| 202110 | LHN-10 | AR | 744 | -131 | -131 | -132 | -132 | -133 | -134 | -134 | -136 | -137 | -138 | -139 | -140 | -142 | -143 | -145 | -147 | -149 | -151 | -153 | -155 | -156 | -155 | -153 | -156 | -154 |
| 202109 | LHN-10 | AR | 720 | -132 | -132 | -132 | -133 | -133 | -134 | -135 | -136 | -137 | -138 | -139 | -141 | -142 | -144 | -145 | -147 | -149 | -152 | -154 | -155 | -156 | -153 | -152 | -155 | -147 |
| 202108 | LHN-10 | AR | 744 | -131 | -132 | -132 | -133 | -134 | -134 | -135 | -136 | -137 | -139 | -139 | -141 | -142 | -143 | -145 | -147 | -150 | -152 | -154 | -155 | -156 | -153 | -151 | -155 | -149 |
| 202107 | LHN-10 | AR | 744 | -132 | -133 | -134 | -134 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -142 | -143 | -145 | -146 | -148 | -150 | -152 | -154 | -155 | -156 | -152 | -151 | -155 | -148 |
| 202106 | LHN-10 | AR | 720 | -132 | -133 | -133 | -134 | -134 | -135 | -136 | -137 | -138 | -139 | -141 | -142 | -143 | -145 | -146 | -148 | -150 | -152 | -155 | -156 | -156 | -154 | -153 | -156 | -147 |
| 202105 | LHN-10 | AR | 744 | -132 | -133 | -134 | -135 | -136 | -136 | -137 | -138 | -140 | -141 | -142 | -143 | -144 | -146 | -148 | -150 | -152 | -153 | -155 | -156 | -156 | -154 | -153 | -156 | -146 |
| 202104 | LHN-10 | AR | 720 | -132 | -133 | -134 | -135 | -136 | -137 | -138 | -139 | -141 | -141 | -143 | -144 | -145 | -147 | -148 | -150 | -152 | -154 | -156 | -157 | -156 | -152 | -150 | -153 | -148 |
| 202103 | LHN-10 | AR | 634 | -133 | -133 | -134 | -135 | -136 | -136 | -137 | -139 | -140 | -141 | -142 | -143 | -145 | -146 | -148 | -150 | -152 | -154 | -155 | -156 | -155 | -151 | -147 | -144 | -143 |