Post Falls weather in December

In December, Post Falls sees average daytime highs of 34°F and overnight lows near 26°F, with 3.8 in of precipitation across 13.6 wet days and about 8.3 hours of daylight. It is the 12th-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 36°F in the first days to 33°F by the end. The sky is clear or mostly clear about 14% of the time in December, and the air most often feels dry.

Daylight stretches from about 8 h 30 min at the start of December to 8 h 18 min by month's end. Set against the rest of the year, December is Post Falls's 12th-clearest and 9th-windiest month. For the whole year in context, see Post Falls's year-round climate.

Daytime high
34°
12th warmest
Overnight low
26°
2nd coldest
Precipitation
3.8 in
13.6 wet days
Daylight
8 h 12 min
7:37 AM – 3:51 PM
Cloud cover
76%
12th clearest
Wind
5 mph
9th windiest
Solar energy
1.03 kWh/m²
Travel score
0.0
out of 10

Post Falls is city in Kootenai County, Idaho, United States.

Density
817/km²
people per km²
Founded
1871

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 36°F in the first days to 33°F by the end.

A typical December day in Post Falls reaches about 34°F in the afternoon and slips back to 26°F overnight — a 9°F spread between the day's warmth and the night's chill. On most days the high lands between 25°F and 43°F. Set against its neighbours, December runs about 8°F cooler than November and on par with January.

10°20°30°40°50°151015202531
Avg high (°F)Avg low (°F)
13727
23627
33627
43627
53627
63526
73526
83526
93526
103526
113526
123526
133526
143526
153426
163426
173426
183425
193425
203425
213425
223425
233425
243325
253325
263325
273325
283324
293324
303324
313324

How December really feels in Post Falls

Once humidity and wind are folded in, December averages 0 days that feel above 90°F and 31 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
31
wind chill below the day's low

The story in December is cold — wind chill drags the overnight "feels like" below the raw low.

Post Falls weather by month

How December compares with the rest of the year at a glance. December is the 12th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan35° / 25°3.614.310.18.70.0
Feb39° / 26°2.511.47.69.90.0
Mar47° / 31°3.213.85.911.61.3
Apr56° / 37°2.712.41.613.33.5
May65° / 44°2.39.60.114.95.9
Jun72° / 50°1.77.6015.77.0
Jul83° / 57°0.73.4015.47.3
Aug82° / 56°0.72.9014.17.4
Sep72° / 49°1.150.112.47.7
Oct57° / 39°2.59.20.510.64.2
Nov42° / 31°3.8146.19.10.5
Dec34° / 26°3.813.610.28.30.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 10% of December, with mostly cloudy or overcast conditions the remaining 76%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12773
22872
32773
42773
52773
62674
72674
82674
92575
102575
112476
122476
132278
142278
152278
162278
172278
182278
192278
202278
212278
222179
232377
242377
252377
262377
272377
282575
292575
302476
312476

Chance of precipitation in December

Any precipitationSnow

Post Falls gets around 3.8 in of rain and snow over 13.6 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 45% and peaks near 46% on the wettest days, and about 10 days bring snow.

0%20%40%60%151015202531
Rain chance (%)Snow chance (%)
14529
24529
34530
44430
54430
64430
74430
84430
94430
104431
114431
124432
134532
144533
154633
164633
174634
184534
194534
204535
214535
224435
234435
244435
254435
264436
274436
284536
294536
304536
314636

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in December

Winds average 5 mph in December.

Across December, daily wind ranges from about 5 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
16calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 8 h 30 min at the start of December to 8 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 7:23 AM to 7:43 AM, and sunset from 3:52 PM to 3:59 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.57:233:52
28.57:243:52
38.47:253:52
48.47:263:51
58.47:273:51
68.47:283:51
78.47:293:51
88.37:303:50
98.37:313:50
108.37:323:50
118.37:333:50
128.37:343:50
138.37:353:50
148.27:363:50
158.27:363:51
168.27:373:51
178.27:383:51
188.27:383:51
198.27:393:52
208.27:403:52
218.27:403:52
228.27:413:53
238.27:413:53
248.27:423:54
258.27:423:54
268.27:423:55
278.27:433:56
288.27:433:56
298.27:433:57
308.27:433:58
318.37:433:59

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.03 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.03 kWh/m² to a high of 7.52 kWh/m² in July across the year — December's 1.03 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
11.1Dim
21.1Dim
31.1Dim
41.1Dim
51.1Dim
61.1Dim
71.1Dim
81.0Dim
91.0Dim
101.0Dim
111.0Dim
121.0Dim
131.0Dim
141.0Dim
151.0Dim
161.0Dim
171.0Dim
181.0Dim
191.0Dim
201.0Dim
211.0Dim
221.0Dim
231.0Dim
241.0Dim
251.0Dim
261.0Dim
271.0Dim
281.0Dim
291.1Dim
301.1Dim
311.1Dim
Planning a trip in December

Is December a good time to visit Post Falls?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

0.0
Sightseeing
10th-best month of the year
0.0
Beach & pool
8th-best month of the year

December is a weaker month for outdoor sightseeing in Post Falls.

What to pack for Post Falls in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, Post Falls sees daytime highs around 34°F and nights near 26°F. Pack a warm layer and a heavy coat. Worth having: rain gear. About 14 days see rain.

a warm layera heavy coatrain gear

UV index in Post Falls in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Post Falls peaks around July 17 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 17UV 8Dec 15UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5Moderate
May7High
Jun6High
Jul9Very high
Aug6High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Post Falls in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Post Falls is worst in August — around 30 µg/m³ PM2.5 (moderate), about 4.9× the cleanest month (December, 6 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 1828 µg/m³Dec 216 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb8Good
Mar10Good
Apr11Good
May11Good
Jun10Good
Jul13Moderate
Aug30Moderate
Sep20Moderate
Oct11Good
Nov11Good
Dec6Good
Location & terrain

Where is Post Falls?

Post Falls sits at 47.7°N, 117.0°W, 2,182 ft above sea level, in United States. The nearest listed city is Coeur d'Alene, 8.7 mi away.

Topography around Post Falls

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Post Falls.

Within 2 miles, the terrain around Post Falls has significant variations in elevation — a maximum elevation change of 876 ft around an average of 2,198 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,261 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 5,318 ft.

The land around Post Falls is covered by trees (33%), artificial surfaces (32%) and grassland (26%) within 2 miles, trees (56%) and grassland (23%) within 10 miles, and trees (63%) within 50 miles.

2 miles
876 ft
10 miles
3,261 ft
50 miles
5,318 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Coeur d'Alene 8.7 mi · Spokane Valley 14 mi · Opportunity 14 mi · Spokane 22 mi · Moscow 68 mi · Pullman 69 mi · Lewiston 90 mi · Lewiston Orchards 93 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Post Falls (47.718°, -116.9516°, elevation 2,182 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).