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. | 268s | 228s | 193s | 164s | 139s | 118s | 100s | 85s | 72s | 61s | 52s | 44s | 37s | 32s | 27s | 23s | 19s | 16s | 14s | 12s | 10s |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 201105 | LHN | AR | 45 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |
| 201104 | LHN | AR | 720 | -120 | -122 | -122 | -124 | -126 | -127 | -129 | -130 | -132 | -133 | -134 | -136 | -137 | -138 | -139 | -141 | -142 | -143 | -143 | -144 | -144 |
| 201103 | LHN | AR | 744 | -127 | -129 | -131 | -133 | -134 | -137 | -139 | -140 | -142 | -144 | -145 | -147 | -148 | -149 | -149 | -150 | -149 | -148 | -146 | -145 | -144 |
| 201102 | LHN | AR | 672 | -118 | -120 | -122 | -123 | -125 | -126 | -128 | -129 | -130 | -132 | -134 | -135 | -136 | -138 | -139 | -140 | -141 | -142 | -142 | -142 | -142 |
| 201101 | LHN | AR | 744 | -116 | -119 | -120 | -121 | -123 | -124 | -125 | -127 | -129 | -130 | -131 | -133 | -134 | -136 | -137 | -139 | -140 | -140 | -140 | -141 | -139 |
| 201012 | LHN | AR | 744 | -118 | -119 | -120 | -122 | -123 | -125 | -126 | -127 | -129 | -130 | -131 | -133 | -134 | -136 | -137 | -138 | -139 | -140 | -141 | -141 | -142 |
| 201011 | LHN | AR | 720 | -119 | -121 | -122 | -123 | -124 | -125 | -126 | -128 | -129 | -130 | -132 | -133 | -135 | -136 | -137 | -139 | -139 | -140 | -140 | -140 | -140 |
| 201010 | LHN | AR | 742 | -119 | -120 | -122 | -123 | -124 | -126 | -127 | -128 | -129 | -131 | -132 | -134 | -135 | -137 | -138 | -139 | -140 | -141 | -141 | -141 | -142 |
| 201009 | LHN | AR | 720 | -126 | -128 | -129 | -131 | -132 | -133 | -134 | -136 | -137 | -138 | -140 | -141 | -142 | -144 | -145 | -146 | -147 | -146 | -146 | -146 | -146 |
| 201008 | LHN | AR | 724 | -124 | -126 | -127 | -129 | -130 | -132 | -134 | -135 | -137 | -138 | -139 | -141 | -142 | -143 | -144 | -146 | -146 | -147 | -148 | -149 | -148 |
| 201007 | LHN | AR | 744 | -126 | -128 | -129 | -131 | -133 | -135 | -136 | -138 | -139 | -140 | -141 | -143 | -144 | -145 | -146 | -147 | -148 | -148 | -149 | -150 | -148 |
| 201006 | LHN | AR | 720 | -128 | -130 | -132 | -133 | -135 | -137 | -138 | -139 | -141 | -142 | -143 | -144 | -146 | -147 | -148 | -149 | -149 | -149 | -150 | -150 | -149 |
| 201005 | LHN | AR | 744 | -127 | -129 | -130 | -132 | -134 | -135 | -136 | -138 | -139 | -140 | -142 | -143 | -144 | -144 | -145 | -146 | -147 | -147 | -147 | -147 | -147 |
| 201004 | LHN | AR | 695 | -127 | -128 | -129 | -131 | -132 | -133 | -135 | -136 | -137 | -139 | -140 | -141 | -142 | -142 | -144 | -144 | -145 | -144 | -143 | -144 | -143 |
| 201003 | LHN | AR | 737 | -129 | -131 | -133 | -134 | -135 | -137 | -138 | -139 | -141 | -142 | -143 | -144 | -146 | -147 | -147 | -148 | -148 | -146 | -144 | -144 | -141 |
| 201002 | LHN | AR | 671 | -129 | -131 | -133 | -135 | -137 | -139 | -140 | -142 | -143 | -145 | -146 | -147 | -149 | -149 | -150 | -151 | -150 | -148 | -147 | -146 | -145 |
| 201001 | LHN | AR | 695 | -128 | -131 | -132 | -135 | -137 | -139 | -140 | -142 | -144 | -145 | -146 | -147 | -148 | -150 | -150 | -151 | -150 | -148 | -144 | -144 | -143 |
| 200912 | LHN | AR | 738 | -126 | -128 | -130 | -132 | -134 | -136 | -137 | -139 | -141 | -142 | -143 | -144 | -146 | -147 | -148 | -149 | -148 | -146 | -144 | -143 | -142 |
| 200911 | LHN | AR | 716 | -125 | -127 | -129 | -130 | -132 | -133 | -135 | -136 | -138 | -139 | -141 | -142 | -143 | -144 | -146 | -147 | -147 | -147 | -145 | -144 | -143 |
| 200910 | LHN | AR | 740 | -127 | -129 | -130 | -132 | -133 | -135 | -136 | -138 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -147 | -146 | -145 | -145 | -143 |
| 200909 | LHN | AR | 720 | -126 | -127 | -129 | -131 | -132 | -134 | -136 | -136 | -138 | -139 | -140 | -142 | -142 | -143 | -144 | -145 | -146 | -147 | -147 | -147 | -145 |
| 200908 | LHN | AR | 744 | -127 | -128 | -130 | -131 | -133 | -134 | -135 | -137 | -138 | -140 | -141 | -142 | -143 | -144 | -146 | -147 | -147 | -148 | -148 | -149 | -149 |
| 200907 | LHN | AR | 742 | -126 | -128 | -129 | -131 | -132 | -133 | -134 | -136 | -137 | -138 | -139 | -141 | -141 | -143 | -143 | -144 | -145 | -146 | -147 | -147 | -147 |
| 200906 | LHN | AR | 660 | -129 | -131 | -132 | -134 | -135 | -136 | -136 | -138 | -140 | -140 | -142 | -142 | -143 | -145 | -145 | -147 | -147 | -148 | -149 | -149 | -148 |
| 200905 | LHN | AR | 718 | -126 | -128 | -130 | -131 | -132 | -134 | -135 | -137 | -139 | -140 | -141 | -143 | -144 | -145 | -146 | -146 | -147 | -148 | -148 | -149 | -148 |
| 200904 | LHN | AR | 694 | -127 | -129 | -130 | -132 | -133 | -135 | -136 | -138 | -140 | -140 | -141 | -142 | -143 | -144 | -146 | -146 | -147 | -147 | -148 | -147 | -146 |
| 200903 | LHN | AR | 707 | -124 | -127 | -129 | -131 | -133 | -135 | -137 | -139 | -140 | -142 | -143 | -145 | -146 | -147 | -148 | -149 | -150 | -149 | -148 | -147 | -146 |
| 200902 | LHN | AR | 672 | -125 | -128 | -130 | -132 | -135 | -136 | -138 | -140 | -141 | -142 | -144 | -145 | -146 | -148 | -148 | -150 | -149 | -148 | -148 | -147 | -144 |
| 200901 | LHN | AR | 721 | -122 | -124 | -126 | -127 | -129 | -131 | -133 | -134 | -136 | -137 | -139 | -140 | -142 | -143 | -144 | -145 | -146 | -146 | -145 | -144 | -143 |
| 200812 | LHN | AR | 744 | -124 | -126 | -129 | -131 | -133 | -134 | -136 | -138 | -139 | -140 | -141 | -142 | -142 | -144 | -144 | -145 | -146 | -144 | -144 | -144 | -142 |
| 200811 | LHN | AR | 663 | -126 | -128 | -130 | -131 | -133 | -134 | -136 | -137 | -138 | -140 | -141 | -143 | -144 | -145 | -146 | -147 | -148 | -148 | -145 | -144 | -144 |
| 200810 | LHN | AR | 731 | -127 | -130 | -131 | -133 | -135 | -136 | -137 | -139 | -140 | -141 | -143 | -144 | -145 | -146 | -146 | -147 | -148 | -147 | -146 | -146 | -146 |
| 200809 | LHN | AR | 691 | -132 | -133 | -134 | -136 | -137 | -138 | -140 | -141 | -142 | -144 | -145 | -145 | -146 | -147 | -147 | -148 | -148 | -148 | -148 | -148 | -147 |
| 200808 | LHN | AR | 670 | -128 | -129 | -130 | -132 | -134 | -135 | -137 | -138 | -139 | -141 | -142 | -143 | -144 | -144 | -145 | -146 | -147 | -148 | -148 | -149 | -148 |
| 200807 | LHN | AR | 716 | -129 | -130 | -132 | -133 | -134 | -136 | -137 | -139 | -140 | -142 | -143 | -143 | -144 | -146 | -147 | -147 | -148 | -149 | -149 | -149 | -148 |
| 200806 | LHN | AR | 691 | -128 | -129 | -131 | -132 | -133 | -135 | -136 | -137 | -138 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -146 | -147 | -148 | -149 | -148 |
| 200805 | LHN | AR | 719 | -127 | -129 | -131 | -133 | -133 | -135 | -136 | -138 | -139 | -141 | -142 | -143 | -144 | -144 | -146 | -146 | -147 | -147 | -148 | -147 | -147 |
| 200804 | LHN | AR | 708 | -127 | -129 | -131 | -132 | -134 | -135 | -136 | -138 | -140 | -141 | -142 | -143 | -143 | -144 | -145 | -146 | -146 | -147 | -146 | -146 | -146 |
| 200803 | LHN | AR | 744 | -127 | -128 | -130 | -131 | -133 | -134 | -135 | -136 | -137 | -139 | -141 | -142 | -143 | -144 | -145 | -146 | -146 | -146 | -146 | -145 | -143 |
| 200802 | LHN | AR | 694 | -128 | -129 | -132 | -133 | -135 | -136 | -138 | -139 | -141 | -143 | -145 | -146 | -147 | -148 | -150 | -150 | -149 | -148 | -147 | -146 | -142 |
| 200801 | LHN | AR | 723 | -125 | -128 | -129 | -131 | -133 | -135 | -137 | -138 | -140 | -141 | -143 | -144 | -145 | -146 | -147 | -148 | -147 | -146 | -145 | -145 | -143 |
| 200712 | LHN | AR | 730 | -127 | -129 | -131 | -132 | -134 | -135 | -137 | -139 | -140 | -141 | -143 | -145 | -146 | -147 | -148 | -149 | -148 | -146 | -145 | -144 | -142 |
| 200711 | LHN | AR | 680 | -125 | -127 | -129 | -131 | -133 | -134 | -136 | -137 | -139 | -140 | -141 | -142 | -143 | -145 | -145 | -146 | -147 | -146 | -145 | -144 | -144 |
| 200710 | LHN | AR | 647 | -127 | -128 | -130 | -132 | -133 | -134 | -136 | -137 | -139 | -139 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -147 | -146 | -145 | -145 |
| 200709 | LHN | AR | 580 | -128 | -130 | -132 | -133 | -135 | -136 | -138 | -139 | -140 | -141 | -142 | -143 | -143 | -144 | -145 | -146 | -147 | -147 | -148 | -147 | -147 |
| 200708 | LHN | AR | 716 | -128 | -130 | -132 | -133 | -135 | -136 | -137 | -139 | -140 | -142 | -142 | -143 | -143 | -144 | -145 | -147 | -147 | -148 | -149 | -151 | -150 |
| 200707 | LHN | AR | 475 | -129 | -130 | -132 | -133 | -134 | -136 | -137 | -138 | -139 | -141 | -141 | -143 | -143 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -149 |
| 200706 | LHN | AR | 637 | -127 | -129 | -131 | -132 | -134 | -136 | -138 | -139 | -141 | -142 | -143 | -143 | -144 | -146 | -147 | -148 | -149 | -150 | -150 | -151 | -150 |
| 200705 | LHN | AR | 695 | -127 | -128 | -130 | -131 | -132 | -134 | -135 | -136 | -138 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -148 | -148 | -148 |
| 200704 | LHN | AR | 654 | -129 | -130 | -132 | -133 | -135 | -136 | -138 | -139 | -140 | -141 | -142 | -144 | -144 | -145 | -146 | -147 | -148 | -147 | -147 | -147 | -143 |
| 200703 | LHN | AR | 679 | -125 | -127 | -129 | -130 | -132 | -133 | -135 | -137 | -138 | -139 | -140 | -142 | -143 | -144 | -145 | -146 | -147 | -147 | -147 | -147 | -145 |
| 200702 | LHN | AR | 651 | -129 | -131 | -133 | -136 | -138 | -139 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -150 | -148 | -147 | -147 | -145 |
| 200701 | LHN | AR | 724 | -127 | -128 | -130 | -132 | -133 | -135 | -136 | -137 | -139 | -140 | -141 | -143 | -144 | -145 | -146 | -147 | -147 | -145 | -144 | -145 | -142 |
| 200612 | LHN | AR | 725 | -127 | -129 | -130 | -133 | -134 | -136 | -137 | -139 | -141 | -142 | -143 | -144 | -145 | -147 | -148 | -149 | -148 | -146 | -144 | -143 | -142 |
| 200611 | LHN | AR | 713 | -125 | -127 | -129 | -131 | -133 | -135 | -136 | -138 | -139 | -140 | -142 | -143 | -144 | -145 | -146 | -147 | -148 | -148 | -147 | -147 | -145 |
| 200610 | LHN | AR | 707 | -128 | -131 | -132 | -134 | -135 | -136 | -138 | -139 | -140 | -141 | -143 | -144 | -145 | -145 | -146 | -147 | -148 | -147 | -147 | -147 | -146 |
| 200609 | LHN | AR | 703 | -129 | -131 | -132 | -133 | -135 | -136 | -138 | -139 | -140 | -142 | -143 | -144 | -146 | -147 | -148 | -149 | -149 | -148 | -148 | -148 | -146 |
| 200608 | LHN | AR | 674 | -129 | -131 | -131 | -133 | -134 | -136 | -137 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -147 | -148 | -149 | -149 | -148 |
| 200607 | LHN | AR | 699 | -127 | -129 | -131 | -132 | -134 | -135 | -136 | -138 | -139 | -140 | -142 | -143 | -144 | -145 | -146 | -147 | -147 | -148 | -149 | -149 | -148 |
| 200606 | LHN | AR | 572 | -128 | -130 | -131 | -132 | -134 | -135 | -136 | -138 | -138 | -140 | -141 | -142 | -143 | -145 | -145 | -147 | -148 | -147 | -148 | -149 | -146 |
| 200605 | LHN | AR | 492 | -129 | -131 | -131 | -133 | -134 | -136 | -137 | -138 | -139 | -141 | -142 | -143 | -143 | -144 | -145 | -145 | -146 | -146 | -146 | -147 | -145 |
| 200604 | LHN | AR | 458 | -132 | -133 | -135 | -136 | -137 | -138 | -140 | -141 | -143 | -144 | -144 | -146 | -147 | -148 | -148 | -149 | -149 | -148 | -148 | -147 | -145 |
| 200603 | LHN | AR | 703 | -130 | -131 | -132 | -133 | -134 | -135 | -137 | -138 | -140 | -141 | -142 | -143 | -144 | -145 | -147 | -148 | -147 | -146 | -145 | -145 | -144 |
| 200602 | LHN | AR | 142 | -134 | -136 | -138 | -140 | -140 | -142 | -144 | -145 | -145 | -147 | -148 | -150 | -151 | -153 | -155 | -155 | -151 | -149 | -147 | -149 | -147 |