7 ms·

Hmm, I can probably incorporate humidity data without too much trouble. Is there a standard way to calculate a "feels like" temperature using humidity? btw, th

Hmm, I can probably incorporate humidity data without too much trouble. Is there a standard way to calculate a "feels like" temperature using humidity? btw, thanks for reminding me of the pleasant places map -- I think it must have been an unconscious influence on this.

gav 5y ago
The calculation from the NWS: https://www.weather.gov/epz/wxcalc_heatindex https://www.weather.gov/epz/wxcalc_heatindex (see the linked PDF[1]) Given an air temperature (T) in °F and a relative humidity (rh). Indexheat = − 42.379 + (2.04901523 × T) + (10.14333127 × rh) − (0.22475541 × T × rh) − (6.83783×10−3×T^2) − (5.481717 × 10−2 × rh^2) + (1.22874 × 10−3 × T^2 × rh) + (8.5282×10−4 × T × rh^2) − (1.99×10−6 × T^2 × rh^2) [1] https://www.weather.gov/media/epz/wxcalc/heatIndex.pdf https://www.weather.gov/media/epz/wxcalc/heatIndex.pdf
- theli0nheart 5y ago
  It would be nice if that document cited sources or provided a methodology for how these values were derived.
  - oh_sigh 5y ago
    Ultimately derived from here: https://journals.ametsoc.org/view/journals/apme/18/7/1520-0450_1979_018_0861_taospi_2_0_co_2.xml?tab_body=pdf https://journals.ametsoc.org/view/journals/apme/18/7/1520-04... The equation came later - the output of that article is just a table, and the equation was derived to be a nice fit over the table's values.
- deleted 5y ago
  [deleted]
lifebypizza 5y ago
I came to comment for this very reason. I care a lot about humidity. Ideally you could include both humidity (dew point is the best measure of humidity, btw) and feels like, but just the humidity would be enough. But yeah, as others mentioned, rainfall, storms, cloudiness, etc, are all things that would be great to include.
silisili 5y ago
Hey thanks, nice work btw. As others pointed out, heat index is a decent indicator I think. Not to 'steal' ideas from the other site, but having that little year avg chart pop up on click is a really killer feature for showing which months are best. For example, I'd much rather live somewhere with 4 solid "uncomfortable" months and 8 solid comfortable, than somewhere with 2 on, 1 off.
- nemo1618 5y ago
  Yep. Personally I'm interested in finding two locations: one with great weather throughout the summer, and one with great weather throughout the winter.
  - silisili 5y ago
    If I had the money... Spokane throughout the summer, central Florida during the winter.
    - deleted 5y ago
      [deleted]
    - ghaff 5y ago
      Don't know about Spokane, but summer would probably be somewhere on the West Coast, northern New England, or higher altitudes in the Southwest (e.g. Santa Fe). Winter is harder but, assuming I was trying to avoid snow, probably somewhere broadly in the desert Southwest.
      - silisili 5y ago
        Sounds like you could minimize travel then by say, Flagstaff and Phoenix, respectively?
        ghaff 5y ago
        Personally, I'm generally fine with snow and cold but but, yeah, if you're looking for fairly temperate climate year-round, it's mostly either California coastal areas or shifting between the lowlands/highlands in the Southwest. As you say, Flagstaff and somewhere in the Phoenix region would be a good example. Probably are examples in Colorado and New Mexico as well. Vegas in winter is also an option many like.
Symmetry 5y ago
You could use the dew point to combine humidity and temperature?
db65edfc7996 5y ago
If taking comments from the peanut gallery...any chance on also limiting to "waking hours"? I mostly do not care what the temperature is at 3am, but it likely dramatically pushes down the low temperatures for a day.
adamjb 5y ago
Australia's Bureau of Meteorology calculates apparent temperature like this AT = Ta + 0.33×e − 0.70×ws − 4.00 where: Ta = Dry bulb temperature (°C) e = Water vapour pressure (hPa) [humidity] ws = Wind speed (m/s) at an elevation of 10 meters The vapour pressure can be calculated from the temperature and relative humidity using the equation: e = rh / 100 × 6.105 × exp ( 17.27 × Ta / ( 237.7 + Ta ) ) where: rh = Relative Humidity [%] http://www.bom.gov.au/info/thermal_stress/#atapproximation http://www.bom.gov.au/info/thermal_stress/#atapproximation
culopatin 5y ago
That would be awesome, because right now it lists my city as ideal and I thought it sucked lol! Yes the temperature is not extreme but when the humidity is 600% it feels like a sauna

gav 5y ago

The calculation from the NWS: https://www.weather.gov/epz/wxcalc_heatindex https://www.weather.gov/epz/wxcalc_heatindex (see the linked PDF[1]) Given an air temperature (T) in °F and a relative humidity (rh). Indexheat = − 42.379 + (2.04901523 × T) + (10.14333127 × rh) − (0.22475541 × T × rh) − (6.83783×10−3×T^2) − (5.481717 × 10−2 × rh^2) + (1.22874 × 10−3 × T^2 × rh) + (8.5282×10−4 × T × rh^2) − (1.99×10−6 × T^2 × rh^2) [1] https://www.weather.gov/media/epz/wxcalc/heatIndex.pdf https://www.weather.gov/media/epz/wxcalc/heatIndex.pdf

theli0nheart 5y ago
It would be nice if that document cited sources or provided a methodology for how these values were derived.
- oh_sigh 5y ago
  Ultimately derived from here: https://journals.ametsoc.org/view/journals/apme/18/7/1520-0450_1979_018_0861_taospi_2_0_co_2.xml?tab_body=pdf https://journals.ametsoc.org/view/journals/apme/18/7/1520-04... The equation came later - the output of that article is just a table, and the equation was derived to be a nice fit over the table's values.
deleted 5y ago
[deleted]

lifebypizza 5y ago

I came to comment for this very reason. I care a lot about humidity. Ideally you could include both humidity (dew point is the best measure of humidity, btw) and feels like, but just the humidity would be enough. But yeah, as others mentioned, rainfall, storms, cloudiness, etc, are all things that would be great to include.

silisili 5y ago

Hey thanks, nice work btw. As others pointed out, heat index is a decent indicator I think. Not to 'steal' ideas from the other site, but having that little year avg chart pop up on click is a really killer feature for showing which months are best. For example, I'd much rather live somewhere with 4 solid "uncomfortable" months and 8 solid comfortable, than somewhere with 2 on, 1 off.

nemo1618 5y ago
Yep. Personally I'm interested in finding two locations: one with great weather throughout the summer, and one with great weather throughout the winter.
- silisili 5y ago
  If I had the money... Spokane throughout the summer, central Florida during the winter.
  - deleted 5y ago
    [deleted]
  - ghaff 5y ago
    Don't know about Spokane, but summer would probably be somewhere on the West Coast, northern New England, or higher altitudes in the Southwest (e.g. Santa Fe). Winter is harder but, assuming I was trying to avoid snow, probably somewhere broadly in the desert Southwest.
    - silisili 5y ago
      Sounds like you could minimize travel then by say, Flagstaff and Phoenix, respectively?
      - ghaff 5y ago
        Personally, I'm generally fine with snow and cold but but, yeah, if you're looking for fairly temperate climate year-round, it's mostly either California coastal areas or shifting between the lowlands/highlands in the Southwest. As you say, Flagstaff and somewhere in the Phoenix region would be a good example. Probably are examples in Colorado and New Mexico as well. Vegas in winter is also an option many like.

Symmetry 5y ago

You could use the dew point to combine humidity and temperature?

db65edfc7996 5y ago

If taking comments from the peanut gallery...any chance on also limiting to "waking hours"? I mostly do not care what the temperature is at 3am, but it likely dramatically pushes down the low temperatures for a day.

adamjb 5y ago

Australia's Bureau of Meteorology calculates apparent temperature like this AT = Ta + 0.33×e − 0.70×ws − 4.00 where: Ta = Dry bulb temperature (°C) e = Water vapour pressure (hPa) [humidity] ws = Wind speed (m/s) at an elevation of 10 meters The vapour pressure can be calculated from the temperature and relative humidity using the equation: e = rh / 100 × 6.105 × exp ( 17.27 × Ta / ( 237.7 + Ta ) ) where: rh = Relative Humidity [%] http://www.bom.gov.au/info/thermal_stress/#atapproximation http://www.bom.gov.au/info/thermal_stress/#atapproximation

culopatin 5y ago

That would be awesome, because right now it lists my city as ideal and I thought it sucked lol! Yes the temperature is not extreme but when the humidity is 600% it feels like a sauna