Ottawa River at Thurso
| Monthly and Annual Mean Water Levels in Metres | Annual Extremes | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual Means | Daily Maximum | Daily Minimum | |
| 1991 | 41.66 | 41.65 | 41.65 | 41.90 | 41.43 | 41.26 | 41.22 | 41.20 | 41.21 | 41.25 | 41.29 | 41.44 | 41.43 | 42.44 | 41.14 | |
| 1992 | 41.47 | 41.49 | 41.46 | 41.68 | 41.54 | 41.26 | 41.26 | 41.24 | 41.32 | 41.38 | 41.59 | 41.52 | 41.43 | 41.93 | 41.20 | |
| 1993 | 41.56 | 41.48 | 41.38 | 41.74 | 41.33 | 41.36 | 41.23 | 41.22 | 41.22 | 41.39 | 41.48 | 41.46 | 41.40 | 42.05 | 41.16 | |
| 1994 | 41.41 | 41.52 | 41.49 | 41.45 | 41.53 | 41.45 | 41.45 | 41.35 | 41.25 | 41.23 | 41.32 | 41.36 | 41.40 | 41.85 | 41.04 | |
| 1995 | 41.67 | 41.81 | 41.72 | 41.30 | 41.48 | 41.46 | 41.21 | 41.20 | 41.16 | 41.18 | 41.33 | 41.43 | 41.41 | 42.21 | 41.06 | |
| 1996 | 41.56 | 41.64 | 41.54 | 41.54 | 41.74 | 41.40 | 41.31 | 41.27 | 41.22 | 41.24 | 41.29 | 41.34 | 41.42 | 42.20 | 41.13 | |
| 1997 | 41.45 | 41.58 | 41.64 | 41.66 | 42.06 | 41.39 | 41.28 | 41.21 | 41.21 | 41.22 | 41.27 | 41.29 | 41.44 | 42.50 | 41.11 | |
| 1998 | 41.38 | 41.40 | 41.50 | 41.90 | 41.26 | 41.22 | 41.22 | 41.17 | 41.16 | 41.16 | 41.16 | 41.23 | 41.31 | 42.74 | 41.05 | |
| 1999 | 41.38 | 41.49 | 41.49 | 41.46 | 41.25 | 41.29 | 41.26 | 41.19 | 41.19 | 41.32 | 41.48 | 41.61 | 41.37 | 41.94 | 41.09 | |
| 2000 | 41.49 | 41.48 | 41.30 | 41.47 | 41.57 | 41.35 | 41.29 | 41.27 | 41.23 | 41.19 | 41.23 | 41.23 | 41.34 | 41.87 | 40.81 | |
| 2001 | 41.30 | 41.39 | 41.36 | 41.41 | 41.35 | 41.29 | 41.20 | 41.17 | 41.20 | 41.34 | 41.49 | 41.56 | 41.34 | 41.67 | 41.13 | |
| 2002 | 41.59 | 41.49 | 41.53 | 41.63 | 41.78 | 41.64 | 41.27 | 41.15 | 41.14 | 41.16 | 41.16 | 41.17 | 41.39 | 42.16 | 41.04 | |
| 2003 | 41.17 | 41.18 | 41.32 | 41.47 | 41.33 | 41.32 | 41.21 | 41.25 | 41.17 | 41.30 | 41.68 | 41.92 | 41.36 | 42.21 | 41.05 | |
| 2004 | 41.87 | 41.67 | 41.65 | 41.65 | 41.84 | 41.44 | 41.30 | 41.13 | 41.15 | 41.12 | 41.10 | 41.15 | 41.42 | 42.17 | 40.96 | |
| 2005 | 41.35 | 41.29 | 41.17 | 41.76 | 41.44 | 41.26 | 41.20 | 41.17 | 41.10 | 41.20 | 41.23 | --- | 41.29 | 41.97 | 41.02 | |
| 2006 | 41.63 | 41.73 | 41.67 | 41.76 | 41.53 | 41.32 | 41.28 | 41.27 | 41.24 | 41.40 | 41.68 | 41.69 | 41.52 | 42.09 | 41.20 | |
| 2007 | 41.76 | 41.71 | 41.66 | 41.52 | 41.33 | 41.42 | 41.27 | 41.18 | 41.16 | 41.16 | 41.16 | 41.27 | 41.38 | 42.00 | 41.05 | |
| 2008 | 41.62 | 41.69 | 41.69 | 42.20 | 41.75 | 41.48 | 41.54 | 41.50 | 41.30 | 41.25 | 41.32 | 41.48 | 41.57 | 42.57 | 41.12 | |
| 2009 | 41.65 | 41.65 | 41.72 | 41.84 | 41.77 | 41.46 | 41.41 | 41.38 | 41.22 | 41.24 | 41.37 | 41.34 | 41.50 | 42.30 | 41.12 | |
| 2010 | 41.39 | 41.44 | 41.46 | 41.28 | 41.21 | 41.20 | 41.17 | 41.16 | 41.24 | 41.35 | 41.37 | 41.74 | 41.33 | 42.01 | 40.93 | |
| 2011 | 41.57 | 41.51 | 41.66 | 41.58 | 41.75 | 41.42 | 41.30 | 41.21 | 41.20 | 41.19 | 41.20 | 41.32 | 41.41 | 42.09 | 41.02 | |
| 2012 | 41.42 | 41.47 | 41.66 | 41.46 | 41.37 | 41.24 | 41.19 | 41.17 | 41.18 | 41.26 | 41.37 | 41.44 | 41.35 | 41.89 | 41.09 | |
| 2013 | 41.52 | 41.64 | 41.58 | 41.80 | 41.98 | 41.65 | 41.27 | 41.20 | 41.21 | 41.29 | 41.56 | 41.48 | 41.51 | 42.24 | 41.16 | |
| 2014 | 41.56 | 41.56 | 41.35 | 41.82 | 41.98 | 41.46 | 41.27 | 41.25 | 41.31 | 41.45 | 41.45 | 41.48 | 41.50 | 42.22 | 41.19 | |
| 2015 | 41.71 | 41.55 | 41.42 | 41.54 | 41.44 | 41.32 | 41.20 | 41.20 | 41.22 | 41.19 | 41.28 | 41.47 | 41.38 | 41.90 | 41.12 | |
| 2016 | 41.94 | 42.06 | 42.07 | 41.99 | 41.62 | 41.35 | 41.21 | 41.19 | 41.18 | 41.18 | 41.20 | 41.31 | 41.52 | 42.63 | 41.00 | |
| 2017 | 41.44 | 41.52 | 41.78 | 42.28 | 42.62 | 41.62 | 41.47 | 41.28 | 41.29 | 41.25 | 41.45 | 41.53 | 41.63 | 43.69 | 41.18 | |
| 2018 | 41.69 | 41.66 | 41.50 | 41.39 | 41.89 | 41.43 | 41.24 | 41.21 | 41.32 | 41.40 | 41.43 | 41.46 | 41.47 | 42.31 | 41.09 | |
| 2019 | 41.52 | 41.65 | 41.57 | 42.32 | 43.13 | 41.75 | 41.23 | 41.14 | 41.14 | 41.03 | 41.28 | 41.34 | 41.59 | 43.66 | 40.85 | |
| 2020 | 41.44 | 41.42 | 41.63 | 41.83 | 41.48 | 41.33 | 41.21 | 41.25 | 41.29 | 41.39 | 41.44 | 41.49 | 41.43 | 42.22 | 41.14 | |
| 2021 | 41.82 | 41.63 | 41.56 | 41.30 | 41.19 | 41.16 | 41.25 | 41.19 | 41.22 | 41.35 | 41.29 | 41.43 | 41.37 | 41.97 | 41.09 | |
| 2022 | 41.47 | 41.45 | 41.64 | 41.75 | 41.74 | 41.74 | 41.26 | 41.22 | --- | 41.25 | 41.23 | 41.38 | 41.46 | 42.11 | 41.11 | |
| Mean - Moyenne | 41.55 | 41.56 | 41.56 | 41.68 | 41.65 | 41.40 | 41.27 | 41.22 | 41.21 | 41.26 | 41.35 | 41.43 | 41.43 | 42.24 | 41.09 | |
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual Means | Daily Maximum | Daily Minimum | |