Roy, United States experiences average highs of 16°C (61°F) and lows of 4°C (39°F) throughout the year. The climate is relatively dry, with only 7 rainy days per month on average. Sunshine is abundant, averaging about 10 hours per day. Average highs have warmed by 1.0°C (1.8°F) across the available records.
Roy, United States Weather & Climate 2026
Monthly climate averages for Roy, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jun–Nov 
Wetter season: Jan–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.5/10
Best: June, July, August, September
UV Index
5
Low
Temperature 16°C / 4°C
Feels Like 14°C / 1°C
Rainy Days 7
Rainfall 43 mm
Sunshine 10 h
Humidity 58%
Wind Speed 11 km/h
Dew Point 2°C
Snow Days 8 days
Frost Days 19 days
Hottest Month
33°C
July
Avg Low18°C
Rain2days
Coldest Month
-8°C
January
Avg High1°C
Rain10days
Driest Month
2days
July
Avg High33°C
Avg Low18°C
Windiest Month
13 km/h
June (Gusts 41)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 05:56
Daylight 15.1h
Sunset 21:04
Live conditions—
Roy on the map · live conditions
Roy, United States
- Continent
- Americas
- Country
- United States
- City
- Roy
- Population
- 38K
- Elevation
- 1,384 m
- Coordinates
- 41.16°, -112.03°
Seasonal Breakdown
Spring
Mar–May
Avg High 14°C
Avg Low 2°C
Rain 10 days/mo
Summer
Jun–Aug
Avg High 31°C
Avg Low 16°C
Rain 3 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 17°C
Avg Low 5°C
Rain 6 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 2°C
Avg Low -7°C
Rain 10 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 1°C / -8°C . Feb: 3°C / -6°C . Mar: 8°C / -2°C . Apr: 14°C / 2°C . May: 20°C / 7°C . Jun: 28°C / 13°C . Jul: 33°C / 18°C . Aug: 31°C / 16°C . Sep: 26°C / 12°C . Oct: 17°C / 5°C . Nov: 9°C / -1°C . Dec: 3°C / -7°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 66 mm. Feb: 57 mm. Mar: 62 mm. Apr: 57 mm. May: 48 mm. Jun: 17 mm. Jul: 6 mm. Aug: 22 mm. Sep: 36 mm. Oct: 45 mm. Nov: 42 mm. Dec: 58 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 78%. Feb: 72%. Mar: 70%. Apr: 61%. May: 55%. Jun: 42%. Jul: 35%. Aug: 40%. Sep: 46%. Oct: 57%. Nov: 66%. Dec: 74%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 9 km/h . Feb: 10 km/h . Mar: 11 km/h . Apr: 12 km/h . May: 12 km/h . Jun: 13 km/h . Jul: 12 km/h . Aug: 12 km/h . Sep: 12 km/h . Oct: 11 km/h . Nov: 9 km/h . Dec: 9 km/h .
Sunshine
Sunshine
Sunshine: Jan: 7h. Feb: 8h. Mar: 9h. Apr: 11h. May: 12h. Jun: 14h. Jul: 13h. Aug: 13h. Sep: 11h. Oct: 9h. Nov: 8h. Dec: 7h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 3. Feb: UV 3. Mar: UV 5. Apr: UV 7. May: UV 8. Jun: UV 8. Jul: UV 8. Aug: UV 8. Sep: UV 6. Oct: UV 5. Nov: UV 3. Dec: UV 2.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 14 days. Feb: 11 days. Mar: 11 days. Apr: 4 days. May: 1 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 2 days. Nov: 6 days. Dec: 13 days.
Climate Trends
Average highs have warmed by 1.0°C (1.8°F) across the available records. Average rainfall is trending drier by about 12 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 32°C | Jul · 33°C |
| Coldest month | Jan 2025 · -11°C | Jan · -8°C |
| Wettest month | Oct 2025 · 79 mm | Jan · 66 mm |
| Windiest month | Jul 2025 · 13 km/h | Jun · 13 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Fair May
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October
Fair November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 1°C / -8°C | -2°C / -12°C | 10days (66 mm) Wet | 6.7h Fair | 78% Humid | 2.7 Moderate | Poor | View Details |
| February | 3°C / -6°C | 0°C / -10°C | 9days (57 mm) Wet | 7.9h Good | 72% Muggy | 3.4 Moderate | Poor | View Details |
| March | 8°C / -2°C | 6°C / -6°C | 11days (62 mm) Wet | 9.4h Good | 70% Muggy | 5.2 High | Poor | View Details |
| April | 14°C / 2°C | 12°C / -1°C | 10days (57 mm) Wet | 11h Excellent | 61% Muggy | 6.6 High | Fair | View Details |
| May | 20°C / 7°C | 19°C / 5°C | 8days (48 mm) Wet | 12.4h Excellent | 55% Moderate | 7.6 Very High | Good | View Details |
| June best | 28°C / 13°C | 27°C / 12°C | 3days (17 mm) Excellent | 13.6h Excellent | 42% Moderate | 8.1 Very High | Excellent | View Details |
| July best | 33°C / 18°C | 32°C / 17°C | 2days (6 mm) Excellent | 13.4h Excellent | 35% Comfortable | 8.3 Very High | Excellent | View Details |
| August best | 31°C / 16°C | 30°C / 16°C | 4days (22 mm) Good | 12.5h Excellent | 40% Comfortable | 7.6 Very High | Excellent | View Details |
| September best | 26°C / 12°C | 24°C / 10°C | 4days (36 mm) Good | 11.1h Excellent | 46% Moderate | 6.2 High | Excellent | View Details |
| October | 17°C / 5°C | 14°C / 2°C | 6days (45 mm) Good | 9.4h Good | 57% Moderate | 4.6 Moderate | Fair | View Details |
| November | 9°C / -1°C | 6°C / -5°C | 7days (42 mm) Good | 7.6h Good | 66% Muggy | 3.1 Moderate | Poor | View Details |
| December | 3°C / -7°C | 0°C / -11°C | 10days (58 mm) Wet | 6.5h Fair | 74% Muggy | 2.4 Moderate | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Roy are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Roy, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Roy is July, with average daytime highs of 33°C (91°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Roy is January, with average overnight lows of -8°C (18°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Roy is January, averaging 66mm of precipitation across 10 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Roy runs through March, January, April, December, with the heaviest rainfall in March. Based on 10-year averages for Roy.
Roy receives approximately 122 sunshine hours per year. The sunniest month is June with around 14 hours. Based on climate data for Roy.
The least favorable months to visit Roy are January, February, March, December, primarily due to very cold temperatures, frequent rain. For the best conditions, consider June, July, August, September instead.
The annual average UV index in Roy is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Roy is 58%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Roy receives snow. Months with snowfall average 8 snow days and 17 cm (7 in) of accumulation, with about 19 frost days during winter.
Average wind speeds in Roy are 11 km/h (7 mph). The windiest month is June with peak winds reaching 13 km/h (8 mph) (gusts up to 41 km/h / 26 mph).
Roy averages 9 clear-sky days per month with overall cloud cover around 44%. The clearest skies occur in September.
The annual average dew point in Roy is 2°C (36°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Roy has a Hot-Summer Continental (dry) climate, classified as Dsa under the Köppen system. Continental climates experience extreme temperature ranges — hot summers and cold, snowy winters.
The 'feels like' temperature in Roy ranges from 1°C (34°F) to 14°C (57°F) on average. Wind chill makes winters feel noticeably colder than the actual temperature — layered clothing is recommended.
Yes, June is a great time to visit Roy. It earns a climate score of 9.5/10 with Excellent.
For June in Roy, pack Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses, Comfortable walking shoes. With average highs of 28°C (82°F) and 3 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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