LOCAL CLIMATOLOGICAL DATA
Hourly Summary
May 20, 2026

Station: Westford
Latitude: 44° 37' 38" N
Longitude: 73° 02' 30" W
Elevation (ground): 850 ft.
Time Zone: Eastern

+--+------------------------+----+-----+--------------------+------------------------+------+
|  |       Temperature      |    | Pre-|      Pressure      |           Wind         |Solar |
|  +------+------+------+---+ Hu-|cipi-|  Adj. to Sea Level +----+---+-------+-------+------+
|  |   M  |   M  |      |   |mid-| ta- +------+------+------+ Avg|Res| Peak  |2Minute| Mean |
|  |   a  |   i  |      | D | ity| tion|      |      |      |    |   +---+---+---+---+   W  |
|  |   x  |   n  |      | e |    |     |      |      |      |  S |   | S |   | S |   |   a  |
| H|   i  |   i  |   M  | w |  M |     |      |      |   M  |  p |   | p |   | p |   |   t  |
| o|   m  |   m  |   e  |   |  e |Water|   M  |   M  |   e  |  e | D | e | D | e | D |   t  |
| u|   u  |   u  |   a  | P |  a |     |   a  |   i  |   a  |  e | i | e | i | e | i |   s  |
| r|   m  |   m  |   n  | t |  n |Equiv|   x  |   n  |   n  |  d | r | d | r | d | r |  m²  |
|  |      |      |      |   |    |     |      |      |      |    |   |   |   |   |   |      |
| 1|   2  |   3  |   4  | 5 |  6 |  7  |   8  |   9  |  10  | 11 | 12| 13| 14| 15| 16|  17  |
+--+------+------+------+---+----+-----+------+------+------+----+---+---+---+---+---+------+
|00| 72.8 | 71.2 | 71.9 | 63|  74| 0.00| 29.77| 29.76|29.766| 2.7|181| 13|SSE|  5|169|    0 |
|01| 74.7 | 72.4 | 73.4 | 64|  72| 0.00| 29.78| 29.76|29.768| 3.3|206| 16|  W|  9|248|    0 |
|02| 74.5 | 70.4 | 72.3 | 64|  75| 0.00| 29.78| 29.76|29.768| 1.9|208|  9|WNW|  4|225|    0 |
|03| 72.9 | 70.3 | 71.6 | 64|  77| 0.00| 29.76| 29.75|29.758| 4.7|213| 19|  S| 10|214|    0 |
|  |      |      |      |   |    |     |      |      |      |    |   |   |   |   |   |      |
|04| 72.9 | 71.4 | 72.1 | 64|  76| 0.00| 29.77| 29.75|29.758| 4.2|219| 20|SSE|  7|224|    0 |
|05| 71.5 | 71.2 | 71.4 | 64|  78| 0.00| 29.76| 29.74|29.748| 3.9|227| 14|WSW|  9|241|    6 |
|06| 71.5 | 70.7 | 71.1 | 64|  79| 0.00| 29.77| 29.76|29.765| 2.1|207| 14|  W|  6|218|   24 |
|07| 71.0 | 70.0 | 70.5 | 64|  81| 0.00| 29.77| 29.76|29.767| 1.4|175|  9|SSE|  4|170|   26 |
|  |      |      |      |   |    |     |      |      |      |    |   |   |   |   |   |      |
|08| 70.5 | 69.9 | 70.2 | 65|  82| 0.00| 29.78| 29.76|29.771| 1.9|194| 10|SSW|  5|213|   39 |
|09| 70.9 | 69.9 | 70.5 | 64|  81| 0.00| 29.79| 29.77|29.782| 4.3|225| 19| SW|  7|234|   53 |
|10| 70.2 | 69.8 | 70.0 | 63|  78| 0.00| 29.80| 29.79|29.795| 6.0|227| 18|  S| 10|238|  128 |
|11| 76.3 | 70.1 | 73.6 | 63|  70| 0.00| 29.80| 29.79|29.798| 6.4|222| 23|  W| 10|241|  717 |
|  |      |      |      |   |    |     |      |      |      |    |   |   |   |   |   |      |
|12| 77.2 | 75.4 | 76.7 | 63|  62| 0.00| 29.81| 29.80|29.800| 5.3|231| 17|  W|  9|256|  715 |
|13| 78.4*| 74.7 | 76.6 | 61|  58| 0.00| 29.82| 29.81|29.814| 4.5|270| 17|WSW|  9|273|  719 |
|14| 78.3 | 77.3 | 77.9 | 59|  52| 0.00| 29.83| 29.82|29.828| 4.5|279| 20|  W| 10|260|  867 |
|15| 77.4 | 73.8 | 76.0 | 59|  55| 0.00| 29.85| 29.83|29.842| 4.1|278| 16|  W|  9|271|  709 |
|  |      |      |      |   |    |     |      |      |      |    |   |   |   |   |   |      |
|16| 73.8 | 72.0 | 72.9 | 53|  51| 0.00| 29.87| 29.85|29.863| 3.9|274| 16|WSW|  8|263|  497 |
|17| 73.2 | 66.8 | 70.7 | 50|  48| 0.00| 29.88| 29.86|29.876| 2.0|290| 17|WNW|  7|280|  271 |
|18| 66.9 | 64.7 | 65.8 | 49|  54| 0.00| 29.90| 29.88|29.890| 1.0|280| 13|  W|  5|283|   85 |
|19| 64.8 | 62.8 | 63.8 | 47|  54| 0.00| 29.93| 29.90|29.915| 2.1|273| 15|WNW|  6|267|   41 |
|  |      |      |      |   |    |     |      |      |      |    |   |   |   |   |   |      |
|20| 62.8 | 60.0 | 61.3 | 44|  54| 0.00| 29.96| 29.93|29.944| 2.5|274| 17|  W|  7|265|    4 |
|21| 60.0 | 57.5 | 58.9 | 44|  57| 0.00| 30.00| 29.96|29.977| 0.8|284| 11|WNW|  3|269|    0 |
|22| 57.6 | 56.2 | 56.8 | 43|  60| 0.00| 30.02| 29.99|30.005| 0.8|277| 10|  W|  3|278|    0 |
|23| 56.4 | 54.5*| 55.2 | 42|  61| 0.00| 30.04| 30.02|30.029| 0.7|320| 11|  N|  4|343|    0 |
+--+------+------+------+---+----+-----+------+------+------+----+---+---+---+---+---+------+
   | ---- | ---- | ---- | - | -- |Total|                For the day:                 | ---- |
   +------+------+------+---+----+-----+------+------+------+----+---+---+---+---+---+------+
   | ---- | ---- | ---- | - | -- |  T  | 30.04| 29.74|29.834| 3.1|238| 23|  W| 10|238| ---- |
   +------+------+------+---+----+-----+------+------+------+----+---+---+---+---+---+------+
   |     Avg     | Mean |Avg| Avg|Month| Hour | Hour | ---- | -- | - |  Hour |  Hour |  Avg |
   +-------------+------+---+----+-----+------+------+------+----+---+-------+-------+------+
   |     66.4    | 69.6 | 58|66.2| 3.38|  23  |   5  | ---- | -- | - |   11  |   10  | 204.2|
   +-------------+------+---+----+-----+------+------+------+----+---+----+--+---+---+------+
   | Total Snow,        |                                   |             |      |  Heat   0|
   | Ice Pellets        | Greatest Depth on Ground          | Precip Types|Degree+----------+
   |                0.0 | of Snow, Ice Pellets or Ice     0 |  .........  | Days |  Cool   2|
   +--------------------+-----------------------------------+-------------+------+----------+

  NOTES:
   Data in columns 4, 5, 6, 10, 11, 17 are means via continuous observations for each hour.
   Units: Temperature=°F, Wind=mph, Pressure=Inches Hg, Precipitation=inches.
   Column 5: Dew point is calculated from temperature and humidity and is continuously averaged for each hour.
   Column 12: Resultant wind is calculated by the vector sum of continuous wind observations.
   Precipitation types:
     1 FOG, 2 HEAVY FOG, 3 THUNDER, 4 ICE PELLETS, 5 HAIL, 6 GLAZE, 7 DUSTSTORM,
     8 SMOKE/HAZE, 9 BLOWING SNOW.
   Degree Days heating base is 65°F, cooling base is 65°F.