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Ben Lomond climate
Typical historical weather for Ben Lomond, United States, averaged across 10 years of hourly climate data. Pick a date for a specific day.
Want today's actual conditions instead? See the current forecast for Ben Lomond. Planning a garden? See the gardening & growing season planner. Or browse the 365-day climate calendar.
Annual average
13.4°C
across all months
Warmest month
18.1°C
Sep average high
Coolest month
9.5°C
Feb average low
Annual rainfall
723mm
total per year
Ben Lomond is typically hottest in September and coolest in February, a swing of about 8.6°C across the year. About 59% of annual rainfall falls in the three wettest months (January is typically wettest, July driest).
Monthly averages
Average daily high/low temperature (band) and monthly rainfall (bars).
| Month | Avg high | Avg low | Rainfall | Wet days | Humidity | Wind | Cloud | Solar |
|---|---|---|---|---|---|---|---|---|
| Jan | 13.4°C · record 15–19.6°C | 9.8°C · record 5.5–8.5°C | 161mm | 11 | 81% | 3.3 m/s | 60% | 2.5 kWh/m² |
| Feb | 13.6°C · record 14.6–21.9°C | 9.5°C · record 4.5–7.7°C | 125mm | 7 | 77% | 3.9 m/s | 46% | 3.7 kWh/m² |
| Mar | 13.3°C · record 14.5–21.3°C | 9.9°C · record 5.3–9.3°C | 126mm | 11 | 79% | 3.7 m/s | 53% | 4.7 kWh/m² |
| Apr | 14°C · record 16.3–25.5°C | 10.6°C · record 6.5–10.2°C | 36mm | 5 | 80% | 3.7 m/s | 46% | 6.2 kWh/m² |
| May | 14.6°C · record 16–20°C | 11.3°C · record 8.5–10.7°C | 18mm | 2 | 82% | 3.8 m/s | 40% | 7.1 kWh/m² |
| Jun | 16°C · record 16.8–28.6°C | 12.4°C · record 10.1–11.6°C | 3mm | 1 | 82% | 3.8 m/s | 31% | 7.8 kWh/m² |
| Jul | 16.3°C · record 17.5–21.1°C | 13°C · record 10.5–12.3°C | 2mm | 0 | 85% | 3.5 m/s | 28% | 7.6 kWh/m² |
| Aug | 17.4°C · record 18.9–23.5°C | 14.2°C · record 12–13.8°C | 2mm | 0 | 85% | 3.4 m/s | 27% | 6.8 kWh/m² |
| Sep | 18.1°C · record 19.3–31°C | 14.7°C · record 11.5–14.2°C | 5mm | 1 | 83% | 3.1 m/s | 26% | 5.7 kWh/m² |
| Oct | 17.8°C · record 20.3–29°C | 13.8°C · record 8.8–12.3°C | 36mm | 3 | 78% | 3 m/s | 29% | 4.3 kWh/m² |
| Nov | 15.5°C · record 17.9–22.9°C | 11.5°C · record 6.5–10°C | 72mm | 6 | 80% | 3 m/s | 44% | 3 kWh/m² |
| Dec | 13.8°C · record 15.4–21.2°C | 10.1°C · record 5.6–8.9°C | 137mm | 10 | 80% | 3.2 m/s | 58% | 2.3 kWh/m² |
"Avg high"/"Avg low" is the mean daily high/low for that month, averaged across every year on file. The "record" figure alongside it is a different statistic — the single hottest (or coldest) hour ever recorded during that month across all years — so it can sit above or below the average and does not describe the average's year-to-year spread. A "wet day" is any day with at least 1.0mm of rain.
Year to year
Annual average temperature, 2016–2025.
Across these 10 years, the annual average has moved by about -0.51°C per decade. That’s a short window for a reliable long-term climate trend — treat it as indicative, not definitive.
Annual rainfall has moved by about -230.32mm per decade over the same period.
2025 (the most recent year on file) averaged 13.3031009343117°C, below the 9-year baseline of 13.38°C by 0.32 standard deviations.
Typical extremes per year
Rainy days
56.8 days
≥1.0mm rain
Heavy rain days
10.6 days
≥20mm rain
Extreme heat days
0 days
daily high ≥40°C
Frost days
0 days
daily low ≤0°C
Averaged across 10 years on file. Thresholds match PastClimate's data pipeline definitions — see data & sources.
Records on file
Ranked across 10 years of data currently on file (2016–2025).
Hottest day
31°C
2 September 2017
2017 was 1.61 SD above the 9-year average that year
Coldest day
4.5°C
23 February 2023
2023 was 1.42 SD below the 9-year average that year
Wettest day
83.6mm
24 October 2021
2021 was 2.3 SD below the 9-year average that year
Windiest day
11.5m/s
4 February 2024
2024 was 0.3 SD above the 9-year average that year
See the detail: Ben Lomond on 24 October 2021.
Nearby cities
Santa Cruz
Same ERA5 grid cell
Live Oak
Same ERA5 grid cell
Scotts Valley
Same ERA5 grid cell
Capitola
Same ERA5 grid cell
Soquel
Same ERA5 grid cell
Rio Del Mar
Same ERA5 grid cell
Want a side-by-side view instead? Compare Ben Lomond with another city.
Frequently asked questions about Ben Lomond's climate
What is the hottest month in Ben Lomond?
September is typically the warmest month in Ben Lomond, with an average high of 18.1°C. February is typically the coolest, averaging 9.5°C overnight.
How much does it rain in Ben Lomond?
Ben Lomond gets about 723mm of rain a year on average, with roughly 59% of it falling in the three wettest months (January is typically the wettest, July the driest).
How many extremely hot or cold days does Ben Lomond have?
On average, Ben Lomond sees about 0 day(s) a year at or above 40°C and about 0 day(s) at or below 0°C, based on 10 years of data.
Is Ben Lomond getting warmer?
Across the 10 years on file (2016–2025), the annual average temperature has moved by about -0.51°C per decade. That's a short window for a reliable long-term climate trend — treat it as indicative, not definitive.
What is the hottest day on record for Ben Lomond?
The hottest day on file is 2 September 2017 at 31°C, out of 10 year(s) searched.
Data & provenance
↓ Download monthly CSVData source & coverage — ERA5 reanalysis, 2016–2025 (10 years)details
- Source
- ERA5 reanalysis, accessed via the Copernicus Climate Change Service (C3S) Climate Data Store
- Data type
- Reanalysis — a physically consistent reconstruction combining a forecast model with historical observations, not a live station reading or a forecast
- Coverage
- 2016–2025 (10 years) for United States
- Location
- Ben Lomond — 37.000°, -122.000°, ERA5 grid cell center, 12.5 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- Monthly and annual averages, and dated extreme-value records, derived from an hourly base record.
- Spatial resolution
- 0.25° (~25 km) distributed grid — ERA5's native model resolution is finer; this is the publicly distributed regridded product
- Version / refreshed
- Methodology v2026.07 · data last refreshed December 31, 2025
- Limitations
- A model reconstruction, not a station observation — hyper-local extremes (a single storm cell, an urban heat pocket) can differ from a nearby gauge. See the full methodology.
- Attribution
- Generated using Copernicus Climate Change Service information
Cite this data
PastClimate (2026-07-18). Historical climate data for Ben Lomond, United States (37.00°N, 122.00°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Ben Lomond, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 18, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Ben Lomond, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 18, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Ben Lomond, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-18},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.