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The Weather Calculator


Original java script by Ron Moore of the Birmingham, AL, National Weather Service

Temperature Conversion
Enter a number, then click on the appropriate button to see the result.

Fahrenheit ( o F )
Celsius (C)
Celsius ( o C )
Fahrenheit (o F)

Windchill Calculation

Temp
(o F)
Wind
Speed
(mph)
Wind chill =
Temp
(o C)
Wind
Speed
(mph)
Wind chill =

Relative Humidity Calculation

Temp
(F )
Dew
Point
(F)
Relative Humidity =
Temp
(C)
Dew
Point
(C )
Relative Humidity =

Heat Index Calculation

Valid entries are, air temperatures greater than 80 F ( 27 C ), dew point temperatures greater than 65 F ( 12 C ), and relative humidities higher than 40 percent.

Temp
(F )
Dew
Point
(F)
  RH =
Temp
(C)
Dew
Point
(C )
  RH =
Temp
(F )
Relative
Humidity
(%)
Heat Index =
Dew Point =
Temp
(C)
Relative
Humidity
(%)
Heat Index =
Dew Point =

 

CONVERSION TABLES

 

Inches of Mercury to Millibars Conversion Chart

In Hg     Mb          In Hg     Mb           In Hg     Mb           In Hg     Mb

29.00   982.06        29.50    998.99        30.00   1015.92        30.50   1032.85
29.01   982.39        29.51    999.33        30.01   1016.26        30.51   1033.19
29.02   982.73        29.52    999.67        30.02   1016.60        30.52   1033.53
29.03   983.07        29.53   1000.00        30.03   1016.94        30.53   1033.87
29.04   983.41        29.54   1000.34        30.04   1017.27        30.54   1034.21
29.05   983.75        29.55   1000.68        30.05   1017.61        30.55   1034.55
29.06   984.09        29.56   1001.02        30.06   1017.95        30.56   1034.88
29.07   984.43        29.57   1001.36        30.07   1018.29        30.57   1035.22
29.08   984.77        29.58   1001.70        30.08   1018.63        30.58   1035.56
29.09   985.10        29.59   1002.04        30.09   1018.97        30.59   1035.90
29.10   985.44        29.60   1002.37        30.10   1019.31        30.60   1036.24
29.11   985.78        29.61   1002.71        30.11   1019.65        30.61   1036.58
29.12   986.12        29.62   1003.05        30.12   1019.98        30.62   1036.92
29.13   986.46        29.63   1003.39        30.13   1020.32        30.63   1037.25
29.14   986.80        29.64   1003.73        30.14   1020.66        30.64   1037.59
29.15   987.14        29.65   1004.07        30.15   1021.00        30.65   1037.93
29.16   987.47        29.66   1004.41        30.16   1021.34        30.66   1038.27
29.17   987.81        29.67   1004.74        30.17   1021.68        30.67   1038.61
29.18   988.15        29.68   1005.08        30.18   1022.02        30.68   1038.95
29.19   988.49        29.69   1005.42        30.19   1022.35        30.69   1039.29
29.20   988.83        29.70   1005.76        30.20   1022.69        30.70   1039.62
29.21   989.17        29.71   1006.10        30.21   1023.03        30.71   1039.96
29.22   989.51        29.72   1006.44        30.22   1023.37        30.72   1040.30
29.23   989.84        29.73   1006.78        30.23   1023.71        30.73   1040.64
29.24   990.18        29.74   1007.12        30.24   1024.05        30.74   1040.98
29.25   990.52        29.75   1007.45        30.25   1024.39        30.75   1041.32
29.26   990.86        29.76   1007.79        30.26   1024.72        30.76   1041.66
29.27   991.20        29.77   1008.13        30.27   1025.06        30.77   1042.00
29.28   991.54        29.78   1008.47        30.28   1025.40        30.78   1042.33
29.29   991.88        29.79   1008.81        30.29   1025.74        30.79   1042.67
29.30   992.22        29.80   1009.15        30.30   1026.08        30.80   1043.01
29.31   992.55        29.81   1009.49        30.31   1026.42        30.81   1043.35
29.32   992.89        29.82   1009.82        30.32   1026.76        30.82   1043.69
29.33   993.23        29.83   1010.16        30.33   1027.10        30.83   1044.03
29.34   993.57        29.84   1010.50        30.34   1027.43        30.84   1044.37
29.35   993.91        29.85   1010.84        30.35   1027.77        30.85   1044.70
29.36   994.25        29.86   1011.18        30.36   1028.11        30.86   1045.04
29.37   994.59        29.87   1011.52        30.37   1028.45        30.87   1045.38
29.38   994.92        29.88   1011.86        30.38   1028.79        30.88   1045.72
29.39   995.26        29.89   1012.19        30.39   1029.13        30.89   1046.06
29.40   995.60        29.90   1012.53        30.40   1029.47        30.90   1046.40
29.41   995.94        29.91   1012.87        30.41   1029.80        30.91   1046.74
29.42   996.28        29.92   1013.21        30.42   1030.14        30.92   1047.07
29.43   996.62        29.93   1013.55        30.43   1030.48        30.93   1047.41
29.44   996.96        29.94   1013.89        30.44   1030.82        30.94   1047.75
29.45   997.29        29.95   1014.23        30.45   1031.16        30.95   1048.09
29.46   997.63        29.96   1014.57        30.46   1031.50        30.96   1048.43
29.47   997.97        29.97   1014.90        30.47   1031.84        30.97   1048.77
29.48   998.31        29.98   1015.24        30.48   1032.17        30.98   1049.11
29.49   998.65        29.99   1015.58        30.49   1032.51        30.99   1049.45

Millibars to Inches of Mercury Conversion Chart

  Mb    In Hg         Mb    In Hg         Mb    In Hg         Mb    In Hg

980.00  28.94       1000.00 29.53       1020.00 30.12       1040.00 30.71
980.33  28.95       1000.33 29.54       1020.33 30.13       1040.33 30.72
980.67  28.96       1000.67 29.55       1020.67 30.14       1040.67 30.73
981.00  28.97       1001.00 29.56       1021.00 30.15       1041.00 30.74
981.33  28.98       1001.33 29.57       1021.33 30.16       1041.33 30.75
981.67  28.99       1001.67 29.58       1021.67 30.17       1041.67 30.76
982.00  29.00       1002.00 29.59       1022.00 30.18       1042.00 30.77
982.33  29.01       1002.33 29.60       1022.33 30.19       1042.33 30.78
982.67  29.02       1002.67 29.61       1022.67 30.20       1042.67 30.79
983.00  29.03       1003.00 29.62       1023.00 30.21       1043.00 30.80
983.33  29.04       1003.33 29.63       1023.33 30.22       1043.33 30.81
983.67  29.05       1003.67 29.64       1023.67 30.23       1043.67 30.82
984.00  29.06       1004.00 29.65       1024.00 30.24       1044.00 30.83
984.33  29.07       1004.33 29.66       1024.33 30.25       1044.33 30.84
984.67  29.08       1004.67 29.67       1024.67 30.26       1044.67 30.85
985.00  29.09       1005.00 29.68       1025.00 30.27       1045.00 30.86
985.33  29.10       1005.33 29.69       1025.33 30.28       1045.33 30.87
985.67  29.11       1005.67 29.70       1025.67 30.29       1045.67 30.88
986.00  29.12       1006.00 29.71       1026.00 30.30       1046.00 30.89
986.33  29.13       1006.33 29.72       1026.33 30.31       1046.33 30.90
986.67  29.14       1006.67 29.73       1026.67 30.32       1046.67 30.91
987.00  29.15       1007.00 29.74       1027.00 30.33       1047.00 30.92
987.33  29.16       1007.33 29.75       1027.33 30.34       1047.33 30.93
987.67  29.17       1007.67 29.76       1027.67 30.35       1047.67 30.94
988.00  29.18       1008.00 29.77       1028.00 30.36       1048.00 30.95
988.33  29.19       1008.33 29.78       1028.33 30.37       1048.33 30.96
988.67  29.20       1008.67 29.79       1028.67 30.38       1048.67 30.97
989.00  29.21       1009.00 29.80       1029.00 30.39       1049.00 30.98
989.33  29.21       1009.33 29.81       1029.33 30.40       1049.33 30.99
989.67  29.22       1009.67 29.82       1029.67 30.41       1049.67 31.00
990.00  29.23       1010.00 29.83       1030.00 30.42       1050.00 31.01
990.33  29.24       1010.33 29.84       1030.33 30.43       1050.33 31.02
990.67  29.25       1010.67 29.84       1030.67 30.44       1050.67 31.03
991.00  29.26       1011.00 29.85       1031.00 30.45       1051.00 31.04
991.33  29.27       1011.33 29.86       1031.33 30.46       1051.33 31.05
991.67  29.28       1011.67 29.87       1031.67 30.46       1051.67 31.06
992.00  29.29       1012.00 29.88       1032.00 30.47       1052.00 31.07
992.33  29.30       1012.33 29.89       1032.33 30.48       1052.33 31.08
992.67  29.31       1012.67 29.90       1032.67 30.49       1052.67 31.09
993.00  29.32       1013.00 29.91       1033.00 30.50       1053.00 31.09
993.33  29.33       1013.33 29.92       1033.33 30.51       1053.33 31.10
993.67  29.34       1013.67 29.93       1033.67 30.52       1053.67 31.11
994.00  29.35       1014.00 29.94       1034.00 30.53       1054.00 31.12
994.33  29.36       1014.33 29.95       1034.33 30.54       1054.33 31.13
994.67  29.37       1014.67 29.96       1034.67 30.55       1054.67 31.14
995.00  29.38       1015.00 29.97       1035.00 30.56       1055.00 31.15
995.33  29.39       1015.33 29.98       1035.33 30.57       1055.33 31.16
995.67  29.40       1015.67 29.99       1035.67 30.58       1055.67 31.17
996.00  29.41       1016.00 30.00       1036.00 30.59       1056.00 31.18
996.33  29.42       1016.33 30.01       1036.33 30.60       1056.33 31.19
996.67  29.43       1016.67 30.02       1036.67 30.61       1056.67 31.20
997.00  29.44       1017.00 30.03       1037.00 30.62       1057.00 31.21
997.33  29.45       1017.33 30.04       1037.33 30.63       1057.33 31.22
997.67  29.46       1017.67 30.05       1037.67 30.64       1057.67 31.23
998.00  29.47       1018.00 30.06       1038.00 30.65       1058.00 31.24
998.33  29.48       1018.33 30.07       1038.33 30.66       1058.33 31.25
998.67  29.49       1018.67 30.08       1038.67 30.67       1058.67 31.26
999.00  29.50       1019.00 30.09       1039.00 30.68       1059.00 31.27
999.33  29.51       1019.33 30.10       1039.33 30.69       1059.33 31.28
999.67  29.52       1019.67 30.11       1039.67 30.70       1059.67 31.29

MPH to Knots to Meters Per Second Conversion Chart

MPH     Kts    m/sec            MPH      Kts    m/sec

 1      0.9     0.4             51      44.3    22.8
 2      1.7     0.9             52      45.2    23.2
 3      2.6     1.3             53      46.1    23.7
 4      3.5     1.8             54      46.9    24.1
 5      4.3     2.2             55      47.8    24.6
 6      5.2     2.7             56      48.7    25.0
 7      6.1     3.1             57      49.5    25.5
 8      7.0     3.6             58      50.4    25.9
 9      7.8     4.0             59      51.3    26.4
10      8.7     4.5             60      52.1    26.8
11      9.6     4.9             61      53.0    27.3
12     10.4     5.4             62      53.9    27.7
13     11.3     5.8             63      54.7    28.2
14     12.2     6.3             64      55.6    28.6
15     13.0     6.7             65      56.5    29.1
16     13.9     7.2             66      57.4    29.5
17     14.8     7.6             67      58.2    30.0
18     15.6     8.0             68      59.1    30.4
19     16.5     8.5             69      60.0    30.8
20     17.4     8.9             70      60.8    31.3
21     18.2     9.4             71      61.7    31.7
22     19.1     9.8             72      62.6    32.2
23     20.0    10.3             73      63.4    32.6
24     20.9    10.7             74      64.3    33.1
25     21.7    11.2             75      65.2    33.5
26     22.6    11.6             76      66.0    34.0
27     23.5    12.1             77      66.9    34.4
28     24.3    12.5             78      67.8    34.9
29     25.2    13.0             79      68.6    35.3
30     26.1    13.4             80      69.5    35.8
31     26.9    13.9             81      70.4    36.2
32     27.8    14.3             82      71.3    36.7
33     28.7    14.8             83      72.1    37.1
34     29.5    15.2             84      73.0    37.6
35     30.4    15.6             85      73.9    38.0
36     31.3    16.1             86      74.7    38.4
37     32.2    16.5             87      75.6    38.9
38     33.0    17.0             88      76.5    39.3
39     33.9    17.4             89      77.3    39.8
40     34.8    17.9             90      78.2    40.2
41     35.6    18.3             91      79.1    40.7
42     36.5    18.8             92      79.9    41.1
43     37.4    19.2             93      80.8    41.6
44     38.2    19.7             94      81.7    42.0
45     39.1    20.1             95      82.6    42.5
46     40.0    20.6             96      83.4    42.9
47     40.8    21.0             97      84.3    43.4
48     41.7    21.5             98      85.2    43.8
49     42.6    21.9             99      86.0    44.3
50     43.4    22.4            100      86.9    44.7

Knots to MPH to Meters Per Second Conversion Chart

Knots    MPH    m/sec          Knots      MPH     m/sec

 1       1.2     0.5            51       58.7     26.3
 2       2.3     1.0            52       59.8     26.8
 3       3.5     1.5            53       61.0     27.3
 4       4.6     2.1            54       62.1     27.8
 5       5.8     2.6            55       63.3     28.3
 6       6.9     3.1            56       64.4     28.8
 7       8.1     3.6            57       65.6     29.3
 8       9.2     4.1            58       66.7     29.9
 9      10.4     4.6            59       67.9     30.4
10      11.5     5.1            60       69.0     30.9
11      12.7     5.7            61       70.2     31.4
12      13.8     6.2            62       71.3     31.9
13      15.0     6.7            63       72.5     32.4
14      16.1     7.2            64       73.7     32.9
15      17.3     7.7            65       74.8     33.5
16      18.4     8.2            66       76.0     34.0
17      19.6     8.8            67       77.1     34.5
18      20.7     9.3            68       78.3     35.0
19      21.9     9.8            69       79.4     35.5
20      23.0    10.3            70       80.6     36.0
21      24.2    10.8            71       81.7     36.6
22      25.3    11.3            72       82.9     37.1
23      26.5    11.8            73       84.0     37.6
24      27.6    12.4            74       85.2     38.1
25      28.8    12.9            75       86.3     38.6
26      29.9    13.4            76       87.5     39.1
27      31.1    13.9            77       88.6     39.6
28      32.2    14.4            78       89.8     40.2
29      33.4    14.9            79       90.9     40.7
30      34.5    15.4            80       92.1     41.2
31      35.7    16.0            81       93.2     41.7
32      36.8    16.5            82       94.4     42.2
33      38.0    17.0            83       95.5     42.7
34      39.1    17.5            84       96.7     43.2
35      40.3    18.0            85       97.8     43.8
36      41.4    18.5            86       99.0     44.3
37      42.6    19.0            87      100.1     44.8
38      43.7    19.6            88      101.3     45.3
39      44.9    20.1            89      102.4     45.8
40      46.0    20.6            90      103.6     46.3
41      47.2    21.1            91      104.7     46.8
42      48.3    21.6            92      105.9     47.4
43      49.5    22.1            93      107.0     47.9
44      50.6    22.7            94      108.2     48.4
45      51.8    23.2            95      109.3     48.9
46      52.9    23.7            96      110.5     49.4
47      54.1    24.2            97      111.6     49.9
48      55.2    24.7            98      112.8     50.4
49      56.4    25.2            99      113.9     51.0
50      57.5    25.7           100      115.1     51.5