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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 202601 | LHE | AR | 426 | -27 | -28 | -28 | -29 | -28 | -29 | -29 | -29 | -28 | -30 | -30 | -31 | -33 | -35 | -39 | -41 | -43 | -45 | -49 | -51 | -53 | -54 | -53 | -54 | -56 |
| 202512 | LHE | AR | 608 | -22 | -21 | -21 | -20 | -20 | -20 | -20 | -19 | -20 | -21 | -22 | -24 | -26 | -28 | -31 | -34 | -36 | -40 | -43 | -45 | -48 | -50 | -52 | -54 | -55 |
| 202511 | LHE | AR | 701 | -23 | -22 | -23 | -22 | -22 | -22 | -22 | -22 | -22 | -23 | -24 | -26 | -28 | -31 | -33 | -36 | -39 | -42 | -46 | -49 | -51 | -53 | -54 | -56 | -57 |
| 202510 | LHE | AR | 703 | -26 | -27 | -27 | -28 | -28 | -28 | -29 | -29 | -29 | -30 | -31 | -33 | -35 | -38 | -41 | -44 | -47 | -49 | -52 | -56 | -57 | -57 | -57 | -58 | -60 |
| 202509 | LHE | AR | 712 | -34 | -34 | -34 | -35 | -34 | -35 | -35 | -35 | -36 | -36 | -38 | -39 | -41 | -44 | -46 | -49 | -52 | -55 | -58 | -61 | -63 | -63 | -62 | -64 | -64 |
| 202508 | LHE | AR | 742 | -31 | -33 | -32 | -32 | -32 | -33 | -33 | -33 | -34 | -35 | -36 | -37 | -40 | -42 | -45 | -48 | -51 | -54 | -57 | -59 | -60 | -60 | -62 | -64 | -63 |
| 202507 | LHE | AR | 732 | -27 | -29 | -30 | -31 | -32 | -32 | -33 | -33 | -34 | -36 | -37 | -40 | -42 | -44 | -48 | -51 | -54 | -57 | -60 | -63 | -65 | -64 | -66 | -68 | -67 |
| 202506 | LHE | AR | 705 | -31 | -32 | -32 | -32 | -32 | -32 | -32 | -33 | -33 | -34 | -35 | -37 | -39 | -42 | -44 | -48 | -51 | -54 | -57 | -61 | -62 | -62 | -64 | -66 | -65 |
| 202505 | LHE | AR | 741 | -31 | -31 | -31 | -31 | -32 | -32 | -32 | -31 | -32 | -33 | -34 | -36 | -38 | -41 | -43 | -46 | -50 | -53 | -56 | -58 | -61 | -62 | -64 | -64 | -62 |
| 202504 | LHE | AR | 717 | -30 | -30 | -30 | -30 | -30 | -30 | -31 | -31 | -31 | -32 | -34 | -35 | -37 | -39 | -42 | -44 | -47 | -50 | -53 | -56 | -58 | -59 | -60 | -61 | -60 |
| 202503 | LHE | AR | 676 | -29 | -29 | -29 | -29 | -29 | -29 | -30 | -30 | -31 | -32 | -32 | -34 | -37 | -39 | -42 | -45 | -47 | -51 | -53 | -56 | -58 | -58 | -59 | -60 | -59 |
| 202502 | LHE | AR | 671 | -27 | -27 | -27 | -27 | -26 | -26 | -26 | -26 | -27 | -27 | -28 | -29 | -31 | -33 | -35 | -38 | -41 | -44 | -47 | -50 | -54 | -55 | -56 | -58 | -59 |
| 202501 | LHE | AR | 699 | -25 | -25 | -24 | -25 | -25 | -23 | -23 | -24 | -24 | -24 | -26 | -28 | -29 | -31 | -34 | -36 | -39 | -42 | -45 | -48 | -51 | -53 | -55 | -57 | -58 |