Monthly Climatological Summary for May 2026

Name: OFallon Weather   City: OFallon   State: MO
Elevation: 532 ft  Lat: N 38° 50' 20"   Lon: W 090° 43' 42"

                  Temperature (°F), Rain (in), Wind Speed (mph)

                                      Heat  Cool        Avg
    Mean                              Deg   Deg         Wind                 Dom
Day Temp  High   Time   Low    Time   Days  Days  Rain  Speed High   Time    Dir
----------------------------------------------------------------------------------
01  54.1  63.2   15:11  40.4   06:28  10.9   0.0  0.00   2.9  16.0   15:12    NW
02  52.6  60.9   15:46  43.2   23:34  12.4   0.0  0.00   2.2  16.0   11:06     N
03  60.2  77.6   17:27  42.0   02:30   8.3   3.5  0.00   4.9  24.0   13:30    SW
04  68.6  81.0   16:30  56.8   03:28   1.6   5.2  0.00   4.5  28.0   13:35   SSW
05  51.8  71.7   00:01  45.2   18:53  13.6   0.4  0.83   3.2  21.0   00:00     N
06  51.7  62.6   15:28  43.2   23:28  13.3   0.0  0.13   2.6  13.0   12:52    NW
07  54.4  67.3   15:21  38.9   03:12  10.9   0.3  0.00   3.3  19.0   14:42   WSW
08  59.8  72.1   14:08  50.6   03:12   6.4   1.2  0.44   3.6  20.0   15:53   WSW
09  65.4  79.9   15:50  52.2   02:22   4.2   4.7  0.20   3.8  40.0   21:54     W
10  60.1  71.4   15:58  49.2   23:52   5.8   0.9  0.00   2.1  13.0   12:40   NNW
11  61.1  77.2   15:46  42.2   06:06   7.6   3.7  0.00   2.1  15.0   13:47   WNW
12  68.4  81.2   15:46  50.7   05:10   3.6   7.0  0.00   3.8  23.0   13:11    SW
13  65.9  73.9   15:18  51.8   23:48   2.3   3.2  0.00   4.3  24.0   14:05    NW
14  62.0  74.3   16:08  44.3   05:40   5.9   3.0  0.00   2.9  16.0   15:03   SSE
15  71.5  82.8   15:05  60.7   01:59   1.0   7.5  0.00   4.8  22.0   14:09     S
16  72.3  77.0   16:54  67.9   08:52   0.0   7.3  0.52   2.4  15.0   17:01   SSE
17  76.3  85.4   16:09  65.2   05:01   0.0  11.3  0.00   6.0  28.0   15:03     S
18  68.9  77.9   00:00  64.1   16:59   0.1   4.0  2.04   3.8  24.0   08:10     S
19  68.0  76.1   11:13  59.4   23:55   0.6   3.6  0.24   4.3  19.0   10:49     W
20  60.6  67.2   16:53  54.5   07:12   4.7   0.3  0.00   3.0  16.0   07:40   NNE
21  63.3  72.2   14:50  52.3   06:14   3.4   1.7  0.00   3.3  14.0   14:20   ENE
22  63.7  66.3   10:40  61.2   01:36   1.5   0.1  0.00   1.9  14.0   08:42   ENE
23  68.4  76.8   15:21  62.6   05:02   0.7   4.1  0.00   1.3   9.0   15:28    SW
24  70.4  81.4   15:42  60.5   23:55   0.5   5.9  0.06   1.4  13.0   13:22   NNW
----------------------------------------------------------------------------------
    63.3  85.4    17    38.9     7   119.2  78.9  4.46   3.3  40.0     9     WSW

Max >=  90.0  0
Max <=  32.0  0
Min <=  32.0  0
Min <=   0.0  0
Max Rain: 2.04 on day 18
Days of Rain: 8 (>= 0.01 in)  7 (>= 0.10 in)  1 (>= 1.00 in)
Heat Base: 65.0  Cool Base: 65.0  Method: Integration