December 2018 Weather History in Roundup Montana, United States

The data for this report comes from the Logan International Airport. See all nearby weather stations

This report shows the past weather for Roundup, providing a weather history for December 2018. It features all historical weather data series we have available, including the Roundup temperature history for December 2018. You can drill down from year to month and even day level reports by clicking on the graphs.

Roundup Temperature History December 2018

Temperature history in December 2018 in Roundup181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131-10°F-10°F0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°FNovJan
The daily range of reported temperatures (gray bars) and 24-hour highs (red ticks) and lows (blue ticks), placed over the daily average high (faint red line) and low (faint blue line) temperature, with 25th to 75th and 10th to 90th percentile bands.

Hourly Temperature in December 2018 in Roundup

Hourly Temperature in December 2018 in Roundup18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMNovJanfreezingvery coldcold
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The hourly reported temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
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Cloud Cover in December 2018 in Roundup

Cloud Cover in December 2018 in Roundup18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMNovJan
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
no significant cloudno cloud detectedceiling and visibility ok
The hourly reported cloud coverage, categorized by the percentage of the sky covered by clouds.

Daily Precipitation in December 2018 in Roundup

Daily Precipitation in December 2018 in Roundup1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 in0.0 in0.2 in0.2 in0.4 in0.4 in0.6 in0.6 in0.8 in0.8 in1.0 in1.0 in1.2 in1.2 in1.4 in1.4 inNovJan
The daily measured quantity of liquid or liquid-equivalent precipitation.

Snow Depth in December 2018 in Roundup

The daily measured snow depth, where available.

Observed Weather in December 2018 in Roundup

Observed Weather in December 2018 in Roundup18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMNovJan
foghazedrizzlelight rainmoderate rainheavy rainfreezing rainsleetsnow grainslight snowmoderate snowheavy snowhailthunderstorm
The hourly observed weather, color coded by category (in order of severity). If multiple reports are present, the most severe code is shown.
DayObservationsPrecipitationCodes
Sat, Dec 1 Light Snow, Mist0.00 in-SN, BR
Sun, Dec 2 Light Snow, Mist, Patches of Fog0.02 in-SN, BR, BCFG
Mon, Dec 3 Light Snow, Mist0.00 in-SN, BR
Mon, Dec 10 Light Snow0.00 in-SN
Mon, Dec 24 Light Snow, Fog, Freezing Fog, Mist0.03 in-SN, FG, FZFG, BR
Tue, Dec 25 Light Snow, Freezing Fog, Mist0.21 in-SN, FZFG, BR
Wed, Dec 26 Light Snow, Mist0.13 in-SN, BR
Thu, Dec 27 Light Snow, Mist, Patches of Fog0.00 in-SN, BR, BCFG
Fri, Dec 28 Light Snow0.00 in-SN
Sun, Dec 30 Heavy Snow, Snow, Light Snow, Fog, Freezing Fog, Mist, Blowing Snow0.28 in+SN, SN, -SN, FG, FZFG, BR, BLSN
Mon, Dec 31 Light Snow, Mist0.02 in-SN, BR

Hours of Daylight and Twilight in December 2018 in Roundup

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

Sunrise & Sunset with Twilight in December 2018 in Roundup

The solar day over the course of December 2018. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Solar Elevation and Azimuth in December 2018 in Roundup

Solar Elevation and Azimuth in December 2018 in RoundupDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJan00101020200010102020
northeastsouthwest
Solar elevation and azimuth over the course of December 2018. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

Moon Rise, Set & Phases in December 2018 in Roundup

Moon Rise, Set & Phases in December 2018 in Roundup18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNovJanDec 712:21 AMDec 712:21 AMDec 2210:49 AMDec 2210:49 AMJan 56:29 PMJan 56:29 PM7:51 AM7:51 AM5:08 PM5:08 PM3:57 PM3:57 PM7:40 AM7:40 AM7:35 AM7:35 AM4:37 PM4:37 PM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Dec 2018IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
32%1:02 AME2:04 PMW-7:36 AMS233,579 mi
2
22%2:14 AME2:30 PMW-8:24 AMS235,464 mi
3
14%3:24 AME2:56 PMW-9:12 AMS237,443 mi
4
7%4:33 AMESE3:24 PMWSW-10:00 AMS239,504 mi
5
3%5:42 AMESE3:54 PMWSW-10:49 AMS241,632 mi
6
0%6:48 AMESE4:29 PMWSW-11:39 AMS243,794 mi
7
0%7:51 AMESE5:08 PMWSW-12:30 PMS245,921 mi
8
2%8:49 AMESE5:53 PMWSW-1:21 PMS247,910 mi
9
6%9:41 AMESE6:44 PMWSW-2:12 PMS249,627 mi
10
12%10:26 AMESE7:39 PMWSW-3:02 PMS250,924 mi
11
19%11:04 AMESE8:37 PMWSW-3:50 PMS251,653 mi
12
27%11:37 AMESE9:37 PMWSW-4:37 PMS251,686 mi
13
36%12:06 PMESE10:38 PMWSW-5:21 PMS250,934 mi
14
46%12:32 PMESE11:39 PMW-6:05 PMS249,361 mi
15
50%12:56 PME--6:48 PMS246,994 mi
16
66%-12:42 AMW1:19 PME7:31 PMS243,936 mi
17
75%-1:47 AMW1:44 PME8:16 PMS240,366 mi
18
84%-2:54 AMW2:10 PMENE9:03 PMS236,535 mi
19
91%-4:03 AMWNW2:39 PMENE9:53 PMS232,752 mi
20
97%-5:15 AMWNW3:14 PMENE10:48 PMS229,357 mi
21
100%-6:28 AMWNW3:57 PMENE11:46 PMS226,675 mi
22
100%-7:40 AMWNW4:50 PMENE--
23
100%-8:45 AMWNW5:53 PMENE12:47 AMS224,961 mi
24
96%-9:42 AMWNW7:04 PMENE1:49 AMS224,354 mi
25
90%-10:29 AMWNW8:20 PMENE2:50 AMS224,844 mi
26
82%-11:08 AMWNW9:37 PMENE3:48 AMS226,290 mi
27
71%-11:40 AMWNW10:52 PME4:42 AMS228,463 mi
28
60%-12:09 PMW-5:33 AMS231,097 mi
29
50%12:05 AME12:36 PMW-6:22 AMS233,947 mi
30
37%1:16 AME1:02 PMW-7:10 AMS236,815 mi
31
27%2:25 AMESE1:28 PMWSW-7:57 AMS239,561 mi

Humidity Comfort Levels in December 2018 in Roundup

Humidity Comfort Levels in December 2018 in Roundup18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMNovJan
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The hourly reported humidity comfort level, categorized by dew point. The shaded overlays indicate night and civil twilight.

Wind Speed in December 2018 in Roundup

Wind Speed in December 2018 in Roundup1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 mph0 mph10 mph10 mph20 mph20 mph30 mph30 mph40 mph40 mph50 mph50 mph60 mph60 mphNovJan
The daily range of reported wind speeds (gray bars), with maximum gust speeds (red ticks).

Hourly Wind Speed in December 2018 in Roundup

Hourly Wind Speed in December 2018 in Roundup18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMNovJan
0 mph calm 1 mph light air 4 mph light breeze 8 mph gentle breeze 13 mph moderate breeze 18 mph fresh breeze 25 mph strong breeze 31 mph near gale 39 mph gale 47 mph strong gale 55 mph storm 64 mph violent storm 73 mph hurricane force
The hourly reported wind speed, color coded into bands according to the Beaufort scale. The shaded overlays indicate night and civil twilight.

Hourly Wind Direction in 2018 in Roundup

Hourly Wind Direction in 2018 in Roundup18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMNovJan
calmnortheastsouthwest
The hourly reported wind direction, color coded by compass point. The shaded overlays indicate night and civil twilight.

Atmospheric Pressure in December 2018 in Roundup

Atmospheric Pressure in December 2018 in Roundup18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313129.4 inHg29.4 inHg29.6 inHg29.6 inHg29.8 inHg29.8 inHg30.0 inHg30.0 inHg30.2 inHg30.2 inHg30.4 inHg30.4 inHgNovJan
The daily range of atmospheric pressure (gray bars), as measured by the altimeter setting reported in e.g. a METAR report.

The details of the data sources used for this report can be found on the Logan International Airport page.

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