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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 202404 | LHN | AR | 568 | -124 | -126 | -127 | -128 | -129 | -130 | -131 | -132 | -133 | -134 | -134 | -135 | -136 | -137 | -139 | -140 | -142 | -143 | -145 | -146 | -146 | -144 | -144 | -146 | -143 |
| 202403 | LHN | AR | 642 | -124 | -125 | -126 | -127 | -128 | -129 | -131 | -132 | -133 | -134 | -135 | -137 | -138 | -140 | -141 | -143 | -144 | -146 | -147 | -148 | -148 | -145 | -145 | -146 | -143 |
| 202402 | LHN | AR | 672 | -120 | -122 | -123 | -124 | -125 | -126 | -126 | -128 | -129 | -130 | -131 | -133 | -134 | -135 | -136 | -138 | -139 | -141 | -142 | -144 | -144 | -143 | -143 | -143 | -141 |
| 202401 | LHN | AR | 743 | -120 | -121 | -122 | -123 | -124 | -125 | -125 | -126 | -128 | -129 | -130 | -132 | -133 | -134 | -135 | -137 | -138 | -140 | -141 | -143 | -144 | -143 | -143 | -144 | -140 |
| 202312 | LHN | AR | 736 | -119 | -121 | -122 | -123 | -124 | -125 | -126 | -127 | -128 | -129 | -131 | -132 | -133 | -134 | -136 | -137 | -139 | -140 | -142 | -144 | -145 | -145 | -144 | -144 | -140 |
| 202311 | LHN | AR | 667 | -122 | -122 | -124 | -125 | -126 | -127 | -128 | -129 | -131 | -132 | -133 | -134 | -136 | -137 | -139 | -140 | -142 | -144 | -145 | -147 | -147 | -145 | -144 | -146 | -145 |
| 202310 | LHN | AR | 161 | -123 | -124 | -126 | -127 | -129 | -129 | -131 | -131 | -132 | -134 | -136 | -137 | -140 | -140 | -142 | -143 | -144 | -146 | -147 | -149 | -148 | -145 | -143 | -146 | -142 |
| 202307 | LHN | AR | 40 | 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 |
| 202306 | LHN | AR | 293 | -125 | -126 | -127 | -128 | -129 | -130 | -132 | -132 | -134 | -135 | -136 | -138 | -139 | -141 | -142 | -144 | -146 | -148 | -149 | -151 | -149 | -147 | -147 | -149 | -145 |
| 202305 | LHN | AR | 744 | -125 | -127 | -128 | -129 | -130 | -131 | -132 | -134 | -135 | -136 | -137 | -138 | -139 | -141 | -142 | -144 | -146 | -147 | -149 | -150 | -147 | -144 | -145 | -147 | -142 |
| 202304 | LHN | AR | 701 | -124 | -125 | -126 | -128 | -129 | -130 | -131 | -132 | -133 | -134 | -136 | -137 | -138 | -139 | -141 | -142 | -144 | -145 | -147 | -148 | -149 | -146 | -146 | -147 | -146 |
| 202303 | LHN | AR | 743 | -124 | -125 | -127 | -128 | -129 | -129 | -130 | -132 | -132 | -134 | -135 | -136 | -137 | -139 | -140 | -142 | -144 | -145 | -147 | -148 | -148 | -144 | -143 | -144 | -146 |
| 202302 | LHN | AR | 667 | -121 | -122 | -123 | -124 | -125 | -125 | -127 | -127 | -128 | -129 | -130 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -138 | -140 | -141 | -141 | -142 | -142 | -137 |
| 202301 | LHN | AR | 741 | -122 | -123 | -124 | -124 | -125 | -126 | -127 | -128 | -128 | -129 | -130 | -132 | -133 | -134 | -135 | -136 | -138 | -139 | -141 | -142 | -143 | -144 | -144 | -145 | -140 |
| 202212 | LHN | AR | 738 | -122 | -123 | -123 | -124 | -125 | -127 | -127 | -128 | -129 | -130 | -131 | -132 | -133 | -134 | -135 | -136 | -138 | -139 | -141 | -142 | -143 | -142 | -142 | -143 | -143 |
| 202211 | LHN | AR | 702 | -124 | -125 | -126 | -126 | -127 | -128 | -129 | -130 | -131 | -133 | -134 | -135 | -137 | -138 | -140 | -142 | -143 | -145 | -147 | -148 | -148 | -146 | -145 | -146 | -145 |
| 202210 | LHN | AR | 655 | -122 | -123 | -124 | -125 | -126 | -127 | -128 | -130 | -131 | -132 | -134 | -135 | -136 | -138 | -140 | -141 | -143 | -144 | -146 | -147 | -147 | -145 | -146 | -148 | -145 |
| 202209 | LHN | AR | 712 | -121 | -122 | -124 | -124 | -125 | -125 | -128 | -129 | -130 | -131 | -132 | -133 | -135 | -136 | -138 | -139 | -141 | -143 | -144 | -146 | -145 | -144 | -144 | -145 | -143 |
| 202208 | LHN | AR | 666 | -123 | -123 | -125 | -126 | -126 | -127 | -129 | -130 | -131 | -132 | -133 | -134 | -135 | -137 | -138 | -140 | -141 | -142 | -144 | -145 | -146 | -144 | -144 | -148 | -143 |
| 202207 | LHN | AR | 732 | -122 | -123 | -124 | -125 | -126 | -126 | -127 | -128 | -129 | -130 | -131 | -132 | -132 | -133 | -134 | -135 | -137 | -138 | -140 | -141 | -142 | -142 | -144 | -145 | -142 |
| 202206 | LHN | AR | 720 | -120 | -121 | -122 | -124 | -125 | -126 | -126 | -128 | -129 | -130 | -131 | -133 | -134 | -135 | -137 | -139 | -140 | -142 | -144 | -145 | -146 | -146 | -146 | -148 | -144 |
| 202205 | LHN | AR | 730 | -127 | -128 | -129 | -130 | -131 | -132 | -133 | -135 | -135 | -136 | -137 | -138 | -140 | -141 | -143 | -144 | -146 | -147 | -149 | -150 | -148 | -145 | -145 | -148 | -143 |
| 202204 | LHN | AR | 716 | -126 | -127 | -128 | -129 | -131 | -132 | -132 | -133 | -135 | -135 | -136 | -137 | -138 | -140 | -141 | -142 | -144 | -145 | -147 | -148 | -147 | -145 | -145 | -147 | -142 |
| 202203 | LHN | AR | 743 | -122 | -123 | -125 | -126 | -127 | -128 | -129 | -131 | -131 | -132 | -133 | -134 | -136 | -136 | -138 | -139 | -140 | -141 | -143 | -145 | -145 | -144 | -145 | -145 | -141 |
| 202202 | LHN | AR | 669 | -119 | -120 | -122 | -122 | -123 | -125 | -126 | -126 | -128 | -129 | -130 | -131 | -132 | -133 | -135 | -136 | -137 | -139 | -140 | -141 | -143 | -143 | -143 | -144 | -143 |
| 202201 | LHN | AR | 739 | -118 | -119 | -120 | -121 | -122 | -123 | -124 | -125 | -126 | -127 | -128 | -129 | -130 | -132 | -134 | -135 | -136 | -138 | -140 | -141 | -142 | -143 | -143 | -144 | -142 |
| 202112 | LHN | AR | 742 | -117 | -118 | -119 | -120 | -121 | -122 | -123 | -124 | -125 | -126 | -128 | -129 | -130 | -131 | -132 | -134 | -135 | -136 | -138 | -139 | -140 | -141 | -142 | -143 | -142 |
| 202111 | LHN | AR | 718 | -118 | -119 | -120 | -122 | -122 | -123 | -124 | -125 | -127 | -128 | -129 | -130 | -132 | -133 | -134 | -135 | -137 | -139 | -140 | -142 | -143 | -143 | -143 | -144 | -144 |
| 202110 | LHN | AR | 742 | -119 | -120 | -121 | -123 | -124 | -125 | -127 | -128 | -129 | -131 | -132 | -133 | -135 | -136 | -138 | -139 | -141 | -143 | -144 | -146 | -146 | -144 | -144 | -146 | -146 |
| 202109 | LHN | AR | 720 | -119 | -120 | -122 | -122 | -123 | -125 | -126 | -128 | -129 | -130 | -132 | -133 | -134 | -135 | -137 | -138 | -140 | -142 | -143 | -145 | -145 | -144 | -144 | -147 | -145 |
| 202108 | LHN | AR | 743 | -119 | -120 | -121 | -123 | -124 | -125 | -126 | -127 | -129 | -130 | -131 | -132 | -134 | -135 | -136 | -138 | -139 | -141 | -143 | -144 | -144 | -144 | -145 | -146 | -144 |
| 202107 | LHN | AR | 738 | -119 | -120 | -122 | -123 | -124 | -125 | -126 | -127 | -128 | -129 | -130 | -131 | -132 | -134 | -135 | -136 | -137 | -139 | -140 | -141 | -141 | -141 | -142 | -144 | -139 |
| 202106 | LHN | AR | 715 | -115 | -118 | -118 | -120 | -122 | -124 | -125 | -127 | -129 | -130 | -131 | -132 | -133 | -134 | -135 | -136 | -138 | -139 | -140 | -142 | -142 | -143 | -143 | -145 | -141 |
| 202105 | LHN | AR | 207 | -128 | -129 | -131 | -133 | -135 | -135 | -136 | -137 | -137 | -138 | -139 | -138 | -139 | -141 | -142 | -144 | -144 | -146 | -147 | -147 | -147 | -142 | -143 | -147 | -139 |
| 202104 | LHN | AR | 719 | -128 | -130 | -132 | -133 | -134 | -135 | -136 | -137 | -137 | -138 | -140 | -140 | -142 | -143 | -144 | -146 | -147 | -149 | -150 | -151 | -149 | -147 | -146 | -147 | -143 |
| 202103 | LHN | AR | 744 | -127 | -128 | -129 | -130 | -130 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -138 | -138 | -140 | -141 | -142 | -143 | -145 | -146 | -146 | -145 | -145 | -145 | -142 |
| 202102 | LHN | AR | 598 | -127 | -128 | -129 | -131 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -138 | -138 | -140 | -141 | -142 | -144 | -145 | -147 | -148 | -147 | -144 | -144 | -146 | -139 |
| 202101 | LHN | AR | 734 | -122 | -124 | -124 | -126 | -127 | -127 | -128 | -129 | -130 | -131 | -132 | -132 | -134 | -135 | -135 | -137 | -138 | -140 | -141 | -143 | -144 | -143 | -143 | -143 | -137 |
| 202012 | LHN | AR | 723 | -123 | -124 | -126 | -126 | -127 | -128 | -129 | -130 | -131 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -139 | -140 | -142 | -143 | -144 | -144 | -145 | -145 | -140 |
| 202011 | LHN | AR | 700 | -125 | -126 | -127 | -128 | -129 | -130 | -131 | -132 | -133 | -134 | -135 | -136 | -138 | -139 | -140 | -142 | -144 | -145 | -147 | -149 | -149 | -146 | -145 | -147 | -145 |
| 202010 | LHN | AR | 578 | -124 | -127 | -128 | -129 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -138 | -140 | -141 | -143 | -144 | -146 | -148 | -149 | -151 | -151 | -149 | -147 | -148 | -146 |
| 202009 | LHN | AR | 720 | -128 | -129 | -131 | -133 | -134 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -142 | -143 | -145 | -147 | -148 | -150 | -152 | -152 | -150 | -148 | -147 | -149 | -145 |
| 202008 | LHN | AR | 714 | -127 | -128 | -130 | -131 | -132 | -133 | -133 | -134 | -135 | -136 | -138 | -138 | -139 | -140 | -142 | -144 | -145 | -147 | -148 | -149 | -149 | -147 | -148 | -149 | -145 |
| 202007 | LHN | AR | 738 | -128 | -129 | -131 | -131 | -133 | -133 | -134 | -134 | -135 | -136 | -136 | -137 | -138 | -139 | -139 | -141 | -142 | -144 | -145 | -147 | -148 | -147 | -147 | -148 | -146 |
| 202006 | LHN | AR | 710 | -131 | -132 | -132 | -134 | -135 | -137 | -138 | -138 | -139 | -139 | -140 | -141 | -142 | -144 | -146 | -147 | -149 | -151 | -152 | -153 | -150 | -145 | -145 | -148 | -141 |
| 202005 | LHN | AR | 722 | -135 | -137 | -139 | -140 | -142 | -143 | -144 | -145 | -146 | -147 | -147 | -147 | -147 | -148 | -149 | -152 | -154 | -156 | -158 | -158 | -154 | -150 | -149 | -148 | -145 |
| 202004 | LHN | AR | 703 | -135 | -136 | -138 | -140 | -141 | -142 | -144 | -144 | -146 | -144 | -145 | -145 | -145 | -147 | -148 | -151 | -152 | -154 | -156 | -156 | -151 | -148 | -147 | -148 | -145 |
| 202003 | LHN | AR | 702 | -128 | -130 | -131 | -131 | -133 | -133 | -134 | -135 | -136 | -136 | -137 | -138 | -139 | -139 | -140 | -140 | -141 | -143 | -144 | -145 | -145 | -144 | -145 | -146 | -142 |
| 202002 | LHN | AR | 610 | -126 | -127 | -128 | -129 | -130 | -130 | -131 | -132 | -134 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -142 | -144 | -146 | -147 | -148 | -145 | -145 | -144 | -140 |
| 202001 | LHN | AR | 439 | -123 | -124 | -125 | -126 | -128 | -128 | -129 | -131 | -132 | -133 | -134 | -135 | -136 | -138 | -139 | -141 | -142 | -144 | -145 | -146 | -146 | -145 | -145 | -145 | -142 |
| 201912 | LHN | AR | 698 | -120 | -121 | -122 | -124 | -125 | -126 | -127 | -128 | -129 | -130 | -131 | -133 | -134 | -135 | -136 | -137 | -139 | -140 | -142 | -143 | -144 | -144 | -144 | -145 | -144 |
| 201911 | LHN | AR | 271 | -118 | -120 | -120 | -122 | -123 | -124 | -126 | -127 | -128 | -129 | -131 | -131 | -132 | -133 | -135 | -136 | -137 | -138 | -140 | -142 | -143 | -144 | -144 | -145 | -143 |
| 201910 | LHN | AR | 19 | 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 |
| 201909 | LHN | AR | 485 | -122 | -122 | -125 | -126 | -127 | -128 | -129 | -130 | -131 | -132 | -133 | -134 | -135 | -136 | -138 | -139 | -141 | -143 | -144 | -145 | -146 | -145 | -145 | -147 | -146 |
| 201908 | LHN | AR | 735 | -120 | -122 | -123 | -124 | -125 | -126 | -128 | -129 | -130 | -131 | -132 | -133 | -133 | -135 | -136 | -137 | -138 | -139 | -140 | -142 | -143 | -143 | -144 | -146 | -144 |
| 201907 | LHN | AR | 726 | -114 | -114 | -116 | -117 | -119 | -120 | -122 | -123 | -124 | -125 | -127 | -128 | -129 | -130 | -131 | -133 | -133 | -135 | -136 | -137 | -138 | -139 | -140 | -142 | -139 |
| 201906 | LHN | AR | 687 | -112 | -114 | -115 | -116 | -117 | -118 | -120 | -121 | -122 | -123 | -125 | -126 | -127 | -129 | -130 | -131 | -133 | -134 | -135 | -137 | -138 | -139 | -140 | -142 | -141 |
| 201905 | LHN | AR | 620 | -115 | -115 | -117 | -118 | -120 | -121 | -122 | -123 | -124 | -125 | -127 | -129 | -130 | -132 | -133 | -134 | -136 | -137 | -139 | -140 | -141 | -141 | -142 | -143 | -140 |
| 201904 | LHN | AR | 191 | -120 | -121 | -123 | -124 | -125 | -126 | -128 | -129 | -130 | -131 | -133 | -134 | -135 | -136 | -138 | -139 | -140 | -142 | -143 | -144 | -144 | -144 | -145 | -146 | -144 |
| 201903 | LHN | AR | 625 | -118 | -119 | -121 | -123 | -123 | -125 | -126 | -127 | -129 | -130 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -138 | -140 | -140 | -141 | -141 | -142 | -143 | -140 |
| 201902 | LHN | AR | 442 | -121 | -123 | -123 | -125 | -126 | -128 | -129 | -129 | -130 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -140 |
| 201901 | LHN | AR | 463 | -118 | -119 | -119 | -120 | -121 | -123 | -124 | -125 | -127 | -128 | -129 | -129 | -131 | -132 | -134 | -135 | -136 | -137 | -139 | -140 | -142 | -142 | -143 | -143 | -141 |
| 201812 | LHN | AR | 145 | -122 | -123 | -122 | -123 | -125 | -126 | -125 | -126 | -127 | -128 | -129 | -130 | -131 | -133 | -136 | -136 | -138 | -140 | -142 | -143 | -143 | -143 | -143 | -143 | -135 |
| 201811 | LHN | AR | 122 | -127 | -128 | -129 | -132 | -133 | -134 | -133 | -135 | -136 | -134 | -137 | -137 | -138 | -138 | -139 | -141 | -142 | -143 | -144 | -145 | -146 | -145 | -145 | -146 | -144 |
| 201810 | LHN | AR | 466 | -128 | -129 | -130 | -130 | -131 | -132 | -132 | -133 | -134 | -135 | -136 | -136 | -137 | -138 | -140 | -141 | -142 | -144 | -146 | -147 | -147 | -145 | -145 | -147 | -144 |
| 201809 | LHN | AR | 599 | -133 | -135 | -135 | -136 | -138 | -139 | -139 | -139 | -139 | -140 | -141 | -141 | -141 | -142 | -143 | -144 | -146 | -147 | -149 | -150 | -148 | -145 | -145 | -146 | -143 |
| 201808 | LHN | AR | 580 | -129 | -130 | -131 | -131 | -132 | -133 | -133 | -134 | -134 | -134 | -135 | -135 | -136 | -136 | -137 | -138 | -139 | -140 | -142 | -143 | -144 | -144 | -145 | -146 | -143 |
| 201807 | LHN | AR | 633 | -129 | -130 | -132 | -132 | -132 | -133 | -133 | -134 | -134 | -135 | -135 | -136 | -136 | -137 | -138 | -138 | -139 | -141 | -142 | -143 | -143 | -143 | -144 | -146 | -141 |
| 201806 | LHN | AR | 683 | -131 | -132 | -133 | -134 | -135 | -135 | -136 | -136 | -137 | -137 | -138 | -139 | -139 | -141 | -142 | -143 | -144 | -146 | -147 | -149 | -148 | -146 | -146 | -148 | -142 |
| 201804 | LHN | AR | 492 | -136 | -138 | -140 | -140 | -142 | -143 | -144 | -144 | -145 | -146 | -146 | -146 | -147 | -148 | -149 | -151 | -152 | -154 | -155 | -155 | -153 | -149 | -147 | -149 | -148 |
| 201803 | LHN | AR | 700 | -128 | -129 | -130 | -132 | -133 | -134 | -135 | -136 | -137 | -137 | -138 | -139 | -140 | -142 | -144 | -146 | -148 | -151 | -153 | -155 | -154 | -151 | -150 | -151 | -148 |
| 201802 | LHN | AR | 59 | 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 |