Almanac Averages and Extremes for April 30
OTTAWA MACDONALD-CARTIER INT'L A
ONTARIO
| Category (Period of Record) | Value | Year |
|---|---|---|
| Average Maximum Temperature | 15.2 °C | |
| Average Minimum Temperature | 4.2 °C | |
| Monthly Frequency of Precipitation | 41 % | |
| Highest Temperature (1939-2011) | 28.3 °C | 1970 |
| Lowest Temperature (1939-2011) | -5.4 °C | 1978 |
| Greatest Precipitation (1939-2011) | 21.3 mm | 1947 |
| Greatest Rainfall (1939-2011) | 21.3 mm | 1947 |
| Greatest Snowfall (1939-2011) | 0.2 cm | 1987 |
| Most Snow on the Ground (1955-2011) | 3.0 cm | 2002 |
| Year | Maximum Temperature DefinitionMax Temp °C |
Minimum Temperature DefinitionMin Temp °C |
Mean Temperature DefinitionMean Temp °C |
Total Rain DefinitionTotal Rain mm |
Total Snow DefinitionTotal Snow cm |
Total Precipitation DefinitionTotal Precip mm |
Snow on Ground DefinitionSnow on Grnd cm |
Direction of Maximum Gust DefinitionDir of Max Gust 10's deg |
Speed of Maximum Gust DefinitionSpd of Max Gust km/h |
|---|---|---|---|---|---|---|---|---|---|
| 2011 | 18.6 | 2.2 | 10.4 | 0.0 | 0.0 | 0.0 | 0 | <31 | |
| 2010 | 17.4 | 3.4 | 10.4 | LegendTT | 0.0 | LegendTT | 0 | <31 | |
| 2009 | 20.9 | 1.6 | 11.3 | 12.0 | 0.0 | 12.0 | 0 | 19LegendEE | 35LegendEE |
| 2008 | 9.5 | -1.2 | 4.2 | LegendTT | 0.0 | LegendTT | 0 | 24LegendEE | 32LegendEE |
| 2007 | 13.8 | 3.9 | 8.9 | 0.0 | 0.0 | 0.0 | 0 | 31LegendEE | 63LegendEE |
Legend
- A = Accumulated
- B = More than one occurrence and estimated
- C = Precipitation occurred, amount uncertain
- E = Estimated
- F = Accumulated and estimated
- L = Precipitation may or may not have occurred
- M = Missing
- N = Temperature missing but known to be > 0
- S = More than one occurrence
- T = Trace
- Y = Temperature missing but known to be < 0
- [empty] = Indicates an unobserved value
- ^ = The value displayed is based on incomplete data
- † = Data that is not subject to review by the National Climate Archives
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