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The table shows the combined weather forecast in Helena for three days ahead, automatically compiled according to several independent sources. The time is local. The atmospheric pressure in mm of mercury - at the level of the city (station).
The indicators of Tef (effective temperature), Tefs (effective sun temperature) and verbal characteristics of weather comfort are given (see explanations below).

Weather in Helena

Date Time Weather type Air temperature, °C Atmospheric pressure Wind Precipitation, mm Tef, °C Tefs, °C Weather comfort
20.11
Wen
day
12 h
Light cloudy -9 662 W
1 m/s
0.0 -11 -11
20.11
Wen
day
15 h
Mostly cloudy -9 662 W
1 m/s
0.0 -11 -11
20.11
Wen
even
18 h
Mostly cloudy -4 663 NE
1 m/s
0.0 -5 -4
20.11
Wen
even
21 h
Light cloudy -0 662 NE
1 m/s
0.0 0 +2
21.11
Thu
night
00 h
Light cloudy -3 660 SW
1 m/s
0.0 -4 -4
21.11
Thu
night
03 h
Partly cloudy -4 660 SW
1 m/s
0.0 -4 -4
21.11
Thu
morn
06 h
Cloudy -2 660 calm 0.0 -1 -1
21.11
Thu
morn
09 h
Partly cloudy -3 659 NW
1 m/s
0.0 -3 -3
21.11
Thu
day
12 h
Mostly cloudy -3 659 calm 0.0 -2 -2
21.11
Thu
day
15 h
Mostly cloudy -3 659 SW
1 m/s
0.0 -4 -4
21.11
Thu
even
18 h
Mostly cloudy +2 660 E
1 m/s
0.0 +1 +2
21.11
Thu
even
21 h
Mostly cloudy +4 660 NE
1 m/s
0.0 +4 +5
22.11
Fri
night
00 h
Mostly cloudy +1 660 W
1 m/s
0.0 +1 +1
22.11
Fri
night
03 h
Mostly cloudy 0 660 W
1 m/s
0.0 0 0
22.11
Fri
morn
06 h
Partly cloudy -1 661 W
1 m/s
0.0 -1 -1
22.11
Fri
morn
09 h
Mostly cloudy -1 661 W
1 m/s
0.1 -1 -1
22.11
Fri
day
12 h
Mostly cloudy -1 661 W
1 m/s
0.0 -1 -1
22.11
Fri
day
15 h
Light snow -1 660 SW
1 m/s
0.3 -1 -1
22.11
Fri
even
18 h
Snow with rain 0 659 N
1 m/s
0.9 0 0
22.11
Fri
even
21 h
Rain 0 658 NE
1 m/s
0.8 0 0
23.11
Sat
night
00 h
Cloudy -1 658 NW
2 m/s
0.1 -3 -3
23.11
Sat
night
03 h
Cloudy -2 656 NW
1 m/s
0.1 -2 -2
23.11
Sat
morn
06 h
Mostly cloudy -2 655 NW
1 m/s
0.0 -3 -3
Wen, 20.11
Wen
Wen
Wen
Wen
Thu
Thu
Thu
Thu
12 h
15 h
18 h
21 h
00 h
03 h
06 h
09 h
Air temperature,°С
-9
-9
-4
-0
-3
-4
-2
-3
Atmospheric pressure
662
662
663
662
660
660
660
659
Wind
W
1 m/s
W
1 m/s
NE
1 m/s
NE
1 m/s
SW
1 m/s
SW
1 m/s
calm
NW
1 m/s
Precipitation, mm
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
Tef,°C
-11
-11
-5
0
-4
-4
-1
-3
Tefs,°C
-11
-11
-4
+2
-4
-4
-1
-3
Weather comfort
 
 
 
 
 
 
 
 
Thu
Thu
Thu
Thu
Fri
Fri
Fri
Fri
12 h
15 h
18 h
21 h
00 h
03 h
06 h
09 h
Air temperature,°С
-3
-3
+2
+4
+1
0
-1
-1
Atmospheric pressure
659
659
660
660
660
660
661
661
Wind
calm
SW
1 m/s
E
1 m/s
NE
1 m/s
W
1 m/s
W
1 m/s
W
1 m/s
W
1 m/s
Precipitation, mm
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.1
Tef,°C
-2
-4
+1
+4
+1
0
-1
-1
Tefs,°C
-2
-4
+2
+5
+1
0
-1
-1
Weather comfort
 
 
 
 
 
 
 
 
Fri
Fri
Fri
Fri
Sat
Sat
Sat
12 h
15 h
18 h
21 h
00 h
03 h
06 h
Air temperature,°С
-1
-1
0
0
-1
-2
-2
Atmospheric pressure
661
660
659
658
658
656
655
Wind
W
1 m/s
SW
1 m/s
N
1 m/s
NE
1 m/s
NW
2 m/s
NW
1 m/s
NW
1 m/s
Precipitation, mm
0.0
0.3
0.9
0.8
0.1
0.1
0.0
Tef,°C
-1
-1
0
0
-3
-2
-3
Tefs,°C
-1
-1
0
0
-3
-2
-3
Weather comfort
 
 
 
 
 
 
 
 
  • Wen, 20.11
  • Thu, 21.11
  • Fri, 22.11
Location of a geographical point Helena (Montana, USA): latitude 46.6056 longitude -111.9636 height above sea level 1167 m.
Navigation:
Notes:
Tef - Effective temperature - the temperature felt by a seasonally dressed person in the shade. The calculation takes into account the influence of humidity, wind speed and atmospheric pressure on the human heat perception.
Tefs - Effective sun temperature - the temperature that a person feels, adjusted for solar radiation. Depends on the amount of cloud cover and the height of the sun above the horizon. At night and in cloudy weather the correction is zero.
Weather comfort - a verbal characteristic that characterizes the favorability or unfavorability of forecast meteorological conditions for a seasonally dressed person. Both relative characteristics are used: warm, cool, cold, very cold, showing how much the expected Tef will be higher or lower than the norm, and absolute ones: the risk of sunstroke, the risk of overheating, hot, very hot, stuffy, very stuffy, comfort, the risk of colds, the risk of frostbite that occur when the Tef, Tefs, air temperature or a combination of certain criteria are reached.