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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 201204 | LHE | AR | 168 | -127 | -128 | -129 | -129 | -130 | -130 | -131 | -131 | -133 | -134 | -133 | -135 | -136 | -137 | -137 | -139 | -139 | -140 | -139 | -140 | -135 |
| 201203 | LHE | AR | 744 | -129 | -130 | -131 | -131 | -132 | -133 | -134 | -135 | -135 | -136 | -137 | -138 | -139 | -140 | -140 | -141 | -142 | -141 | -141 | -141 | -138 |
| 201202 | LHE | AR | 694 | -130 | -129 | -132 | -133 | -135 | -136 | -137 | -138 | -139 | -139 | -141 | -142 | -143 | -144 | -145 | -145 | -145 | -142 | -141 | -141 | -137 |
| 201201 | LHE | AR | 744 | -132 | -132 | -135 | -136 | -138 | -139 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -148 | -148 | -148 | -147 | -144 | -143 | -143 | -137 |
| 201112 | LHE | AR | 734 | -133 | -134 | -136 | -137 | -139 | -141 | -142 | -143 | -144 | -145 | -147 | -147 | -148 | -149 | -150 | -150 | -147 | -145 | -144 | -144 | -136 |
| 201111 | LHE | AR | 720 | -134 | -134 | -137 | -138 | -139 | -140 | -142 | -142 | -143 | -145 | -146 | -147 | -148 | -148 | -150 | -150 | -150 | -146 | -144 | -144 | -140 |
| 201110 | LHE | AR | 740 | -132 | -133 | -135 | -136 | -137 | -139 | -139 | -141 | -142 | -142 | -144 | -145 | -146 | -147 | -148 | -149 | -148 | -146 | -146 | -146 | -142 |
| 201109 | LHE | AR | 714 | -131 | -132 | -134 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -142 | -143 | -145 | -146 | -147 | -148 | -147 | -146 | -145 | -144 | -142 |
| 201108 | LHE | AR | 743 | -129 | -129 | -131 | -132 | -133 | -133 | -135 | -135 | -137 | -138 | -139 | -140 | -142 | -143 | -144 | -145 | -145 | -145 | -145 | -147 | -144 |
| 201107 | LHE | AR | 742 | -129 | -130 | -132 | -132 | -134 | -133 | -134 | -135 | -137 | -138 | -139 | -140 | -141 | -142 | -143 | -144 | -144 | -144 | -145 | -145 | -142 |
| 201106 | LHE | AR | 719 | -131 | -132 | -133 | -134 | -136 | -136 | -137 | -138 | -140 | -140 | -141 | -142 | -143 | -145 | -146 | -146 | -146 | -145 | -145 | -146 | -142 |
| 201105 | LHE | AR | 736 | -127 | -128 | -128 | -129 | -129 | -130 | -131 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -138 | -140 | -140 | -140 | -141 | -142 | -140 |
| 201104 | LHE | AR | 718 | -129 | -129 | -130 | -131 | -132 | -133 | -134 | -134 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -142 | -142 | -140 | -141 | -141 | -138 |
| 201103 | LHE | AR | 696 | -130 | -131 | -132 | -133 | -134 | -135 | -135 | -137 | -137 | -138 | -138 | -139 | -141 | -141 | -142 | -143 | -143 | -142 | -142 | -142 | -139 |
| 201102 | LHE | AR | 646 | -132 | -133 | -135 | -137 | -138 | -139 | -140 | -141 | -142 | -143 | -144 | -146 | -146 | -147 | -148 | -147 | -147 | -145 | -143 | -143 | -139 |
| 201101 | LHE | AR | 652 | -133 | -132 | -135 | -137 | -139 | -140 | -141 | -143 | -144 | -145 | -146 | -147 | -148 | -149 | -150 | -150 | -147 | -143 | -142 | -143 | -136 |
| 201012 | LHE | AR | 680 | -132 | -132 | -133 | -135 | -136 | -137 | -138 | -138 | -140 | -141 | -142 | -143 | -143 | -144 | -145 | -146 | -146 | -145 | -143 | -143 | -142 |
| 201011 | LHE | AR | 684 | -131 | -132 | -134 | -136 | -136 | -138 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -146 | -147 | -145 | -143 | -143 | -138 |
| 201010 | LHE | AR | 714 | -133 | -134 | -136 | -137 | -139 | -140 | -141 | -142 | -143 | -144 | -146 | -147 | -148 | -149 | -150 | -151 | -151 | -147 | -145 | -146 | -143 |
| 201009 | LHE | AR | 697 | -130 | -130 | -132 | -133 | -134 | -135 | -137 | -138 | -139 | -140 | -141 | -141 | -143 | -144 | -145 | -145 | -145 | -144 | -144 | -145 | -142 |
| 201008 | LHE | AR | 715 | -129 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -138 | -139 | -141 | -142 | -143 | -144 | -146 | -147 | -146 | -144 | -146 | -147 | -143 |
| 201007 | LHE | AR | 714 | -130 | -130 | -132 | -133 | -134 | -136 | -137 | -138 | -139 | -140 | -141 | -143 | -144 | -145 | -146 | -147 | -144 | -144 | -145 | -147 | -142 |
| 201006 | LHE | AR | 698 | -129 | -131 | -132 | -133 | -134 | -135 | -136 | -138 | -138 | -140 | -141 | -142 | -143 | -144 | -145 | -145 | -146 | -145 | -145 | -146 | -142 |
| 201005 | LHE | AR | 712 | -129 | -130 | -131 | -132 | -133 | -134 | -134 | -135 | -136 | -137 | -139 | -140 | -141 | -141 | -143 | -143 | -144 | -143 | -144 | -145 | -141 |
| 201004 | LHE | AR | 671 | -129 | -130 | -132 | -134 | -135 | -135 | -137 | -137 | -139 | -139 | -141 | -141 | -143 | -143 | -144 | -145 | -144 | -142 | -142 | -142 | -137 |
| 201003 | LHE | AR | 713 | -130 | -130 | -132 | -134 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -141 | -142 | -143 | -144 | -145 | -143 | -141 | -141 | -141 | -133 |
| 201002 | LHE | AR | 653 | -131 | -131 | -134 | -135 | -137 | -138 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -148 | -148 | -149 | -147 | -145 | -142 | -141 | -139 |
| 201001 | LHE | AR | 662 | -132 | -132 | -134 | -136 | -138 | -139 | -141 | -142 | -143 | -143 | -144 | -146 | -147 | -148 | -148 | -149 | -148 | -145 | -142 | -142 | -138 |
| 200912 | LHE | AR | 689 | -132 | -133 | -135 | -137 | -138 | -139 | -142 | -143 | -144 | -145 | -147 | -147 | -149 | -150 | -150 | -150 | -148 | -144 | -143 | -142 | -136 |
| 200911 | LHE | AR | 702 | -131 | -132 | -134 | -135 | -138 | -139 | -140 | -141 | -142 | -143 | -145 | -146 | -147 | -148 | -149 | -149 | -147 | -145 | -144 | -143 | -139 |
| 200910 | LHE | AR | 717 | -131 | -132 | -135 | -136 | -137 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -146 | -147 | -148 | -148 | -147 | -146 | -145 | -145 | -140 |
| 200909 | LHE | AR | 695 | -129 | -130 | -131 | -132 | -133 | -134 | -135 | -137 | -138 | -139 | -140 | -141 | -143 | -144 | -145 | -146 | -147 | -146 | -146 | -145 | -143 |
| 200908 | LHE | AR | 715 | -130 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -139 | -140 | -141 | -142 | -143 | -145 | -146 | -146 | -147 | -146 | -146 | -147 | -145 |
| 200907 | LHE | AR | 711 | -129 | -130 | -132 | -132 | -134 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -143 | -144 | -145 | -147 | -146 | -145 | -145 | -147 | -144 |
| 200906 | LHE | AR | 644 | -130 | -130 | -132 | -132 | -133 | -134 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -142 | -143 | -144 | -145 | -144 | -144 | -146 | -143 |
| 200905 | LHE | AR | 697 | -130 | -131 | -132 | -133 | -134 | -134 | -136 | -137 | -138 | -139 | -140 | -141 | -143 | -144 | -145 | -146 | -146 | -146 | -146 | -148 | -145 |
| 200904 | LHE | AR | 550 | -129 | -130 | -132 | -133 | -134 | -134 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -142 | -143 | -144 | -144 | -142 | -144 | -145 | -139 |