Weather Calculator

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Wind Chill Calculator. Enter a temperature, in either Fahrenheit or Celsius. Then enter a Wind Speed, in either Knots or Mph. Then Click Calculate.

  • The Weather Channel and weather.com provide a national and local weather forecast for cities, as well as weather radar, report and hurricane coverage.
  • Calculators ➡︎ These meteorological calculators will help you convert units and compute various parameters from observations.

Local Time and Weather Around the World

AccraWed 18:3631 °CEdmonton *Wed 12:3616 °CNassau *Wed 14:3630 °C
Addis AbabaWed 21:3621 °CFrankfurt *Wed 20:3616 °CNew DelhiThu 00:0627 °C
AdelaideThu 04:0616 °CGuatemala CityWed 12:3624 °CNew Orleans *Wed 13:3619 °C
AlgiersWed 19:3620 °CHalifax *Wed 15:3616 °CNew York *Wed 14:3620 °C
AlmatyThu 00:36-2 °CHanoiThu 01:3627 °COslo *Wed 20:366 °C
Amman *Wed 21:3620 °CHarareWed 20:36N/AOttawa *Wed 14:36-1 °C
Amsterdam *Wed 20:368 °CHavana *Wed 14:3632 °CParis *Wed 20:3614 °C
AnadyrThu 06:36-9 °CHelsinki *Wed 21:365 °CPerthThu 02:3616 °C
Anchorage *Wed 10:364 °CHong KongThu 02:3624 °CPhiladelphia *Wed 14:3614 °C
AnkaraWed 21:3612 °CHonoluluWed 08:3625 °CPhoenixWed 11:3629 °C
AntananarivoWed 21:3616 °CHouston *Wed 13:3618 °CPrague *Wed 20:3614 °C
AsuncionWed 14:3631 °CIndianapolis *Wed 14:362 °CReykjavikWed 18:367 °C
Athens *Wed 21:3621 °CIslamabadWed 23:3622 °CRio de JaneiroWed 15:3626 °C
Atlanta *Wed 14:3613 °CIstanbulWed 21:3613 °CRiyadhWed 21:3635 °C
AucklandThu 06:3617 °CJakartaThu 01:3629 °CRome *Wed 20:3614 °C
BaghdadWed 21:3639 °CJerusalem *Wed 21:3619 °CSalt Lake City *Wed 12:3611 °C
BangkokThu 01:3629 °CJohannesburgWed 20:3620 °CSan Francisco *Wed 11:3616 °C
Barcelona *Wed 20:3613 °CKarachiWed 23:3628 °CSan JuanWed 14:3631 °C
BeijingThu 02:3616 °CKathmanduThu 00:2115 °CSan SalvadorWed 12:3627 °C
Beirut *Wed 21:3618 °CKingstonWed 13:3630 °CSantiagoWed 14:3622 °C
Belgrade *Wed 20:3616 °CKinshasaWed 19:3631 °CSanto DomingoWed 14:3629 °C
BengaluruThu 00:0626 °CKiritimatiThu 08:3628 °CSão PauloWed 15:3621 °C
Berlin *Wed 20:3613 °CKolkataThu 00:0624 °CSeattle *Wed 11:3616 °C
BogotaWed 13:3621 °CKuala LumpurThu 02:3627 °CSeoulThu 03:3615 °C
Boston *Wed 14:3621 °CKuwait CityWed 21:3628 °CShanghaiThu 02:3618 °C
BrasiliaWed 15:3626 °CKyiv *Wed 21:369 °CSingaporeThu 02:3628 °C
BrisbaneThu 04:3612 °CLa PazWed 14:3613 °CSofia *Wed 21:3613 °C
Brussels *Wed 20:3611 °CLagosWed 19:3630 °CSt. John's *Wed 16:068 °C
Bucharest *Wed 21:3611 °CLahoreWed 23:3621 °CStockholm *Wed 20:369 °C
Budapest *Wed 20:3613 °CLas Vegas *Wed 11:3620 °CSuvaThu 06:3623 °C
Buenos AiresWed 15:3623 °CLimaWed 13:3620 °CSydneyThu 04:3611 °C
CairoWed 20:3620 °CLisbon *Wed 19:3616 °CTaipeiThu 02:3624 °C
Calgary *Wed 12:3614 °CLondon *Wed 19:3612 °CTallinn *Wed 21:368 °C
CanberraThu 04:364 °CLos Angeles *Wed 11:3618 °CTashkentWed 23:369 °C
Cape TownWed 20:3617 °CMadrid *Wed 20:3615 °CTegucigalpaWed 12:3628 °C
CaracasWed 14:3630 °CManaguaWed 12:3633 °CTehran *Wed 23:0626 °C
CasablancaWed 18:3618 °CManilaThu 02:3629 °CTokyoThu 03:3615 °C
Chicago *Wed 13:369 °CMelbourneThu 04:3612 °CToronto *Wed 14:361 °C
Copenhagen *Wed 20:368 °CMexico City *Wed 13:3624 °CVancouver *Wed 11:3613 °C
Dallas *Wed 13:3615 °CMiami *Wed 14:3631 °CVienna *Wed 20:3612 °C
Dar es SalaamWed 21:3626 °CMinneapolis *Wed 13:36-1 °CWarsaw *Wed 20:3613 °C
DarwinThu 04:0627 °CMinskWed 21:3611 °CWashington DC *Wed 14:3612 °C
Denver *Wed 12:361 °CMontevideoWed 15:3624 °CWinnipeg *Wed 13:366 °C
Detroit *Wed 14:366 °CMontréal *Wed 14:36-2 °CYangonThu 01:0628 °C
DohaWed 21:3627 °CMoscowWed 21:366 °CZagreb *Wed 20:3614 °C
DubaiWed 22:3629 °CMumbaiThu 00:0631 °CZürich *Wed 20:3615 °C
Dublin *Wed 19:3611 °CNairobiWed 21:3622 °C

Wind Power / Energy

Formula:

Wind Power = ( 0.5 * D * E * V * A3 )
Where,
D - Density E - Energy Efficiency V - Wind Velocity
A - Windmill Area

Related Calculator:

Relative Humidity, Dew Point

Formula:

es=6.112×exp(17.67×T/T+243.5)
ew=6.112×exp(17.67×Tw/Tw+243.5)
e=ew-psta × (T-Tw)× 0.00066 × (1+0.00115×Tw)
psta(in of Hg to mb)=psta×33.8639
psta(in of Hg to mb)=psta×1.333224
Tdc=(Td-32)×(5/9)
Tdk=(Td+459.67)×5/9


Where,
T = Air temperature
Tw = Wet-bulb temperature
psta = Station pressure
ew = Vapor pressure related to wet-bulb temperature
es = Saturated Vapor pressure
e = actual vapor pressure
rh = Relative humidity
Td = Dewpoint temperature in Fahrenheit
Tdc = Dewpoint temperature in celsius
Tdk = Dewpoint temperature in kelvin

Related Calculator:


Dewpoint, Wet-bulb Temperature

Formula:


1) Dewpoint Temperature
Td = [243.5 x ln(e/6.112)] / [17.67 - ln(e/6.112)]
e = (es x rh) / 100
es = 6.112 x e(17.67xT)/(T+243.5)
2) Wet Bulb Temperature
Ewg = 6.112 x e(17.67xTw)/(Tw+243.5)
eg = Ewg - Psta x (T - Tw) x 0.00066 x (1 + (0.00115 x Tw))
Tw = ΣN ∀ Ed ≠ 0
Ed = e - eg

Where,

Td = Dewpoint Temperature
Tw = Wet Bulb Temperature
T = Temperature
rh = Relative Humidity
Psta = Actual station pressure
e = Vapor Pressure
es = Saturation Vapor Pressure
Ed = Vapor Pressure Difference
N = Increment by 10 and consecutive Ed is opposite sign, increment divide by 10. Its upto reach Ed is zero or absolute value of Ed is greater than 0.05

Related Calculator:

Cyclone Radial Velocity

Formula Used:
Vradial = [( pparticle - pair ) r w2 d2] / ( 18 u )
Where,
vradial = Cyclon Radial Velocity
pparticle = Particle Density
pair = Air Densityr = Radial Distancew = Rotational Velocityd = Particle Diameter u = Air Viscosity

Related Calculator:

Cloud Base

Formula:

Cloud Base = ( ( Temperature - Dew point ) / 4.4 ) * 1000 )
Where,
Temperature – the amount of heat or cold measured on a thermometer.
Dew point – the temperature to which air must be cooled for saturation to occur.

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Rain Water Harvesting

Formula:

Rainfall Harvest = Roof Area x Amount of Rainfall x Collection Efficiency

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Energy Consumption

Formula Used:

Energy Consumed Watts = ( Equipment Size / SEER ),
Energy Consumed (kWh) = Energy Consumed Watts / 1000,
Cost = Energy Consumed (kWh) x Hours x Electric Rate.

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Saturated / Actual Mixing Ratio

Weather

Formula:


Where,
e = Actual vapor pressure,
es = Saturated vapor pressure,
psta = Station pressure,
w = Actual Mixing ratio,
ws = Saturated Mixing ratio,
rh = Relative humidity.

Related Calculator:

Virtual Temperature of Dry Air

Formula:


Where,
Tv = Virtual Temperature,
T = Air Temperature,
Td = Dewpoint temperature,
Psta = Station Pressure.

Related Calculator:

Saturated / Actual Water Vapor Pressure

Formula:


Where,
e = Actual Vapor pressure,
es = Saturated Vapor pressure,
rh = Relative humidity,
Td = Dewpoint Temperature in celcius,
T = Temperature in celcius.

Related Calculator:

Temperature Barometer Reading Correction

Formula:

R = O × ( ( T - 28.630 ) / (1.1123 × T + 10978 ) )
S = O + R


Where,
R = Adjustment Barometer Correction
S = New Reading Barometer Correction
O = Observed Barometer Reading
T = Air Temperature Degrees

Related Calculator:

ASL Temperature Barometer Reading Correction

Formula:

R1 = O x (( T - 28.630 ) / ( 1.1123 x T + 10978 ))
R2 = - 29.92126 x (1 - (1 / 10(0.0081350 x H) / (T + (0.00178308 x H))))
R = R1 + R2
S = O + R


Where,
R = Adjustment Barometer Correction
S = New Reading Barometer Correction
O = Observed Barometer Reading
T = Air Temperature Degrees
H = Above Sea Level

Related Calculator:

Gravity, Elevation and Temperature Barometer Reading Correction

Formula:

R1 = O x (-0.002637 x cos (2L) + 0.000006 x cos2 (2L)) - 0.00005
R2 = O x ((T - 28.630) / (1.1123 x T + 10978))
R3 = - 29.92126 x (1 - (1 / 10(0.0081350 x H) / (T + (0.00178308 x H))))
R = R1 + R2 + R3
S = O + R


Where,
R = Adjustment Barometer Correction
S = New Reading Barometer Correction
O = Observed Barometer Reading
L = Latitude
T = Air Temperature Degrees
H = Above Sea Level

Related Calculator:

Gravity Barometer Reading Correction

Formula:

R = O x (- 0.002637 x cos (2L) + 0.000006 x cos2 (2L) ) - 0.00005
S = O + R


Where,
R = Adjustment Barometer Correction
S = New Reading Barometer Correction
O = Observed Barometer Reading
L = Latitude

Related Calculator:

Above Sea Level Barometer Reading Correction

Formula:

R = - 29.92126 x (1 - (1 / 10(0.0081350 x H) / (T + (0.00178308 x H))))
S = O + R


Where,
R = Adjustment Barometer Correction
S = New Reading Barometer Correction
O = Observed Barometer Reading
H = Above Sea Level
T = Temperature (509.67)

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Volume of Rainfall

Formula:

Water Volume (V) = Water Catchement Area × Rainfall Height

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