![]() "Nothing changes" relates to a high pressure system overhead, with clear skies and light or calm winds.Īnd yes, 2C can produce a frost, because that's 2C as recorded by the weather station which is 1.5 metres above the ground. This is because the temperature can't go any lower than the dew point temperature, or the air would be more than 100% saturated. If nothing changes, the temperature could fall to a minimum of 2C by 8am the next day - the minimum. If nothing changes with the weather (ie the airmass remains the same, typically under a high pressure system), then the dew point at 3pm may show how cold the air temperature will drop overnight.ģpm: the temperature is 16C and the dew point is 2C. FROSTĪnother handy hint with the dew point is the potential for frost tonight. This is dangerous, and shows us why we should consider not just the temperature but also the wind speed. Meanwhile, up in the mountains, a temperature of 2C with a wind of 80km/h, can make it feel like -16C. Melbourne Airport has often had a temperature of 9C with a southerly blowing at 50km/h, so it feels like -2C -> welcome to Melbourne! When you consider both moisture and the wind, it can make it feel very different to what the air temperature states.Ī cold outbreak day in Melbourne may have a temperature of 13C, but the wind is a southwesterly blowing at 35km/h, so it feels like only 5C. Sydney - dew point of 15C = 25C feels like 24Cīrisbane - dew point of 24C = 25C feels like 28C Melbourne - dew point of 5 to 10C = 25C feels like 19C But southern regions will notice a dew point of 15+, as its not a regular occurrence.Īnd this is why an air temperature of 25C can feel so different from city to city. Tropical regions may use 20+ = humid, and 24+ = oppressive. The dew point can tell us more about what it should feel like: The apparent temperature is 28C!īoth situations were 'humid' but one felt frosty, while the other felt oppressive. This produces a relative humidity of 95% and yes, it feels warm, in fact it feels even warmer than it actually is. Its 7am in Brisbane, and the temperature is 25C while the dew point temperature is 24C. In fact, when you take the wind and moisture into account, it feels like only 3C! That's really high humidity, but it doesn't feel warm. This airmass produces a relative humidity of 90%. Its 7am in Melbourne, and the temperature is 5C while the dew point temperature is 4C. Relative to what the air temperature is doing. Relative humidity (Rel Hum) also describes the saturation - so why don't we just use that? I prefer the dew point, because the relative humidity is exactly that, its relative. Or, what temperature you would need to lower the air temperature to, if you wanted saturation - ie. Technically, its is the temperature at which water vapour in the air will condense into liquid water. The dew point temperature (Dew Point) tells us how much moisture is in the air. The apparent temperature (App Temp) is what it 'feels like', when you take the wind and moisture in the air into consideration. This is the one we most often hear about. The temperature (Temp) is the actual air temperature outside, measured out of the direct sunlight.
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