Photo: Jeffrey Beall · CC BY 4.0Arriba is drier than 92% of U.S. towns: 16 inches of precipitation a year
Sunny July days climb to about 89°. A year here swings 73° from midwinter lows to midsummer highs. By January nights alone, it runs colder than 84% of U.S. towns. For walks and days out, May, June and September bring highs of 72–83°.
A year in Arriba at a glance
Each month’s typical high and low, and what it brings.
What stands out about Arriba’s climate
Compared with towns across the U.S., with Arriba’s place in Colorado beside it.
What a year in Arriba feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 155 frost-free days a year
In half of years the last 32° night comes by May 5 and the first by October 8. Frost and day counts come from NOAA’s station at Flagler 1s, CO, 11 miles from the town’s center, 310 ft lower.
The 2023 USDA map puts Arriba’s center in zone 5b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −12°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 25 inches of snow a winter
Snow, measured at Flagler 1s, CO, falls mostly in January. Precipitation (rain plus melted snow) adds up to 16 inches a year; July is the wettest month and December the driest. Rain or snow falls on about 45 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Arriba
88% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Flagler 1s, CO.
Living with Arriba’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
155 frost-free days in zone 5b. The last frost comes by May 5 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 8.
Months with highs of 62–84° and lows of 40° or more: May, June and September. 0.4 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Arriba from natural hazards, river flooding is the largest share (49%); heat waves, cold waves, winter storms and ice storms together are 9%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Arriba and similar climates
TownRatings has no climate map of the towns around Arriba yet.
Climates most like Arriba’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Arriba, CO | 15° | 89° | 16" | 25" |
| Lockwood, MT | 15° | 88° | 15" | 35" |
| White Rock, NM | 18° | 89° | 13" | 20" |
| Torrington, WY | 14° | 90° | 13" | 31" |
| Ephraim, UT | 14° | 89° | 12" | 20" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Arriba averaged 1.2° warmer than the 1900s. The biggest change is in March (+3.2°).
A smaller shift than in 60% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Arriba compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Arriba’s place among Colorado’s.
Arriba weather by month
Highs, lows and precipitation from NOAA’s grid at Arriba’s center; snow, wet days and snow on the ground from Flagler 1s, CO. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 44° | 15° | 0.3" | 5.1" | 2 | 3 | 20° – 36° |
| February | 46° | 17° | 0.3" | 3.8" | 2 | 2 | 26° – 39° |
| March | 55° | 25° | 0.7" | 3.9" | 4 | 2 | 34° – 47° |
| April | 62° | 31° | 1.4" | 3.4" | 4 | 1 | 41° – 53° |
| May | 72° | 42° | 2.4" | 0.6" | 6 | 0 | 50° – 62° |
| June | 83° | 51° | 2.3" | 0.0" | 6 | 0 | 63° – 73° |
| July | 89° | 57° | 2.9" | 0.0" | 7 | 0 | 68° – 77° |
| August | 86° | 55° | 2.8" | 0.0" | 6 | 0 | 66° – 75° |
| September | 79° | 47° | 1.1" | 0.4" | 3 | 0 | 57° – 68° |
| October | 65° | 34° | 0.9" | 1.0" | 3 | 0 | 41° – 56° |
| November | 53° | 23° | 0.4" | 2.4" | 2 | 2 | 30° – 44° |
| December | 44° | 16° | 0.3" | 3.9" | 2 | 2 | 23° – 34° |
| Year | 65° | 34° | 15.7" | 24.5" | 45 | 12 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 20° to 36°. July is the most reliable, staying within 8°.
Where Arriba’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Arriba’s center.
- Snow: Flagler 1s, CO.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Flagler 1s, CO, 11 miles from the town’s center, 310 ft lower; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Arriba’s climate
What is the weather like in Arriba?
A typical July afternoon reaches 89°, a January night drops to 15°, and about 25 inches of snow falls in a normal winter. Colder January nights than 84% of U.S. towns; hotter July afternoons than 71% of U.S. towns.
How cold does it get in Arriba in winter?
January nights average 15°. About 167 nights a year reach 32° or below and 7 reach 0° or below. In the coldest January of the last 30 years the month averaged 20°.
How much snow does Arriba get?
About 25 inches in a normal winter at Flagler 1s, CO, most of it in January, with snow on the ground about 12 days a year.
How hot does it get in Arriba?
July, with a typical high of 89° and a low of 57°. About 43 days a year reach 90° and 3 reach 100° (Flagler 1s, CO).
When is the first and last frost in Arriba?
In half of years the last spring frost (32°) comes by May 5 and the first fall frost by October 8, about 155 frost-free days, at Flagler 1s, CO.
What growing zone is Arriba in?
Zone 5b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −12°.
What is the best time of year to visit Arriba?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Arriba getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 60% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Arriba.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.