Temecula
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Temecula clear sky chart from 2005-11-06 to 2024-03-23.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	4 3 2 3 3 2 3 4 4 6% 66%	79315
	Night	5% 5% 2 4 4 2 3 4 4 6% 61%	80657
Transparency	Day	21% 4 6% 17% 26% 26%	79048
	Night	24% 4 7% 16% 24% 25%	80446
Seeing	Day	6% 6% 18% 35% 25% 10%	14841
	Night	6% 2 9% 35% 38% 10%	25259

By Month

Percentage Cloud Cover SW (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	6% 4 1 3 3 1 3 3 4 5% 66%	2858
	11th to 20th	Day	7% 4 1 3 3 2 4 5% 4 7% 60%	3020
	21st to end	Day	11% 5% 2 4 4 3 5% 5% 5% 7% 49%	3498
February	1st to 10th	Day	8% 4 1 3 4 2 4 4 4 5% 59%	1900
	11th to 20th	Day	7% 4 2 4 4 2 3 3 5% 6% 60%	1850
	21st to end	Day	9% 5% 2 4 5% 3 4 5% 5% 6% 51%	1570
March	1st to 10th	Day	6% 4 2 5% 5% 2 5% 5% 6% 9% 52%	1900
	11th to 20th	Day	7% 3 2 3 5% 2 3 4 4 8% 58%	1982
	21st to end	Day	5% 3 2 3 3 3 4 5% 5% 7% 61%	2327
April	1st to 10th	Day	7% 4 2 4 3 2 3 4 5% 7% 58%	2160
	11th to 20th	Day	3 3 2 3 3 2 3 4 5% 6% 66%	2129
	21st to end	Day	4 3 2 3 3 2 4 2 3 7% 68%	2160
May	1st to 10th	Day	3 5% 2 5% 4 2 2 5% 4 7% 60%	2272
	11th to 20th	Day	2 4 2 4 3 2 3 4 4 6% 67%	2301
	21st to end	Day	3 6% 2 4 3 3 3 2 4 7% 63%	2530
June	1st to 10th	Day	3 4 2 3 3 2 3 3 3 6% 69%	2340
	11th to 20th	Day	1 3 1 3 2 1 2 3 2 4 76%	2340
	21st to end	Day	1 2 1 2 3 1 2 2 2 4 78%	2340
July	1st to 10th	Day	2 2 1 3 3 1 2 3 3 5% 75%	2340
	11th to 20th	Day	1 1 1 2 3 2 3 4 4 7% 72%	2340
	21st to end	Day	2 2 1 2 3 2 4 3 5% 9% 67%	2447
August	1st to 10th	Day	1 2 1 2 2 1 2 3 3 5% 79%	2149
	11th to 20th	Day	1 1 1 1 2 1 1 2 3 5% 81%	2122
	21st to end	Day	1 2 1 2 2 2 3 3 3 4 78%	2376
September	1st to 10th	Day	2 2 1 2 2 2 3 3 3 4 76%	2152
	11th to 20th	Day	2 2 1 2 2 1 2 1 2 3 82%	1980
	21st to end	Day	1 2 1 2 2 1 2 2 3 5% 78%	1980
October	1st to 10th	Day	3 3 1 3 4 2 2 3 5% 6% 69%	1980
	11th to 20th	Day	4 3 1 2 3 1 2 3 3 5% 73%	1967
	21st to end	Day	3 3 1 2 2 2 3 3 3 5% 73%	1886
November	1st to 10th	Day	3 2 2 2 2 2 3 4 4 5% 71%	1674
	11th to 20th	Day	4 3 1 2 3 2 2 4 4 6% 70%	1710
	21st to end	Day	5% 3 2 3 4 2 4 4 5% 7% 60%	1710
December	1st to 10th	Day	5% 4 2 3 4 2 4 4 5% 9% 59%	1710
	11th to 20th	Day	11% 6% 3 5% 5% 3 4 5% 6% 8% 46%	2169
	21st to end	Day	10% 6% 2 5% 6% 4 6% 6% 6% 6% 44%	3146
January	1st to 10th	Night	6% 4 2 3 4 2 3 4 4 6% 63%	4097
	11th to 20th	Night	6% 6% 2 4 4 3 4 4 5% 8% 54%	3952
	21st to end	Night	12% 9% 3 6% 5% 2 3 3 5% 6% 46%	4180
February	1st to 10th	Night	8% 5% 2 4 3 2 3 4 4 5% 61%	2280
	11th to 20th	Night	8% 5% 3 5% 4 3 4 3 3 4 59%	2218
	21st to end	Night	11% 6% 3 5% 4 2 4 5% 4 6% 51%	1884
March	1st to 10th	Night	7% 6% 3 5% 5% 3 4 5% 4 8% 49%	2280
	11th to 20th	Night	8% 5% 2 4 3 3 3 4 4 8% 55%	2196
	21st to end	Night	6% 5% 1 5% 4 2 3 4 5% 7% 56%	2070
April	1st to 10th	Night	8% 6% 3 6% 4 2 3 3 5% 8% 52%	1800
	11th to 20th	Night	6% 6% 3 4 3 3 3 3 4 6% 59%	1779
	21st to end	Night	5% 5% 2 5% 5% 3 4 3 4 6% 58%	1800
May	1st to 10th	Night	2 8% 2 5% 4 3 4 3 5% 8% 55%	1684
	11th to 20th	Night	3 6% 3 6% 6% 3 4 4 5% 7% 55%	1594
	21st to end	Night	5% 9% 2 4 4 3 3 3 4 7% 57%	1746
June	1st to 10th	Night	3 5% 2 4 4 2 4 4 4 7% 62%	1620
	11th to 20th	Night	1 3 2 4 3 2 3 3 4 5% 69%	1620
	21st to end	Night	2 2 1 2 3 2 2 2 3 4 75%	1620
July	1st to 10th	Night	1 2 1 2 3 2 3 3 3 5% 75%	1620
	11th to 20th	Night	1 1 1 2 2 2 3 5% 5% 7% 71%	1620
	21st to end	Night	3 1 1 3 4 2 3 4 5% 7% 66%	1868
August	1st to 10th	Night	2 2 1 2 3 2 2 3 4 6% 73%	1790
	11th to 20th	Night	1 2 1 2 2 2 2 4 7% 76%	1780
	21st to end	Night	1 2 1 3 3 2 3 4 4 4 74%	1980
September	1st to 10th	Night	2 4 1 3 4 2 3 2 3 5% 71%	1807
	11th to 20th	Night	3 3 2 2 2 1 2 2 2 4 77%	1980
	21st to end	Night	2 3 1 2 3 1 2 2 2 3 78%	1980
October	1st to 10th	Night	2 4 2 4 4 2 3 4 5% 5% 65%	1980
	11th to 20th	Night	4 4 1 2 4 2 3 3 2 4 70%	1988
	21st to end	Night	3 4 2 3 3 3 3 3 4 4 69%	2467
November	1st to 10th	Night	3 3 2 3 3 1 3 3 3 6% 70%	2405
	11th to 20th	Night	3 3 2 3 3 2 4 3 4 4 69%	2470
	21st to end	Night	5% 4 2 5% 5% 3 4 4 5% 8% 56%	2470
December	1st to 10th	Night	7% 4 2 4 4 3 4 4 5% 8% 56%	2470
	11th to 20th	Night	10% 7% 3 5% 5% 3 4 4 5% 7% 48%	3041
	21st to end	Night	9% 8% 3 6% 6% 4 5% 5% 5% 7% 44%	4521

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	22% 4 5% 20% 31% 18%	2859
	11th to 20th	Day	25% 6% 11% 26% 19% 15%	3020
	21st to end	Day	33% 7% 7% 12% 24% 17%	3498
February	1st to 10th	Day	28% 5% 5% 12% 22% 28%	1900
	11th to 20th	Day	27% 4 5% 15% 27% 21%	1860
	21st to end	Day	35% 6% 6% 14% 20% 19%	1570
March	1st to 10th	Day	31% 6% 7% 18% 20% 18%	1900
	11th to 20th	Day	26% 5% 9% 18% 25% 16%	1982
	21st to end	Day	24% 6% 11% 26% 21% 14%	2327
April	1st to 10th	Day	27% 4 9% 25% 22% 12%	2160
	11th to 20th	Day	20% 5% 7% 21% 29% 19%	2132
	21st to end	Day	19% 4 8% 23% 34% 12%	2160
May	1st to 10th	Day	25% 5% 9% 19% 26% 16%	2272
	11th to 20th	Day	19% 4 7% 24% 32% 14%	2304
	21st to end	Day	23% 4 8% 26% 30% 9%	2530
June	1st to 10th	Day	18% 3 6% 21% 33% 19%	2340
	11th to 20th	Day	13% 2 4 12% 32% 37%	2340
	21st to end	Day	12% 2 3 7% 26% 51%	2340
July	1st to 10th	Day	11% 3 4 10% 27% 46%	2276
	11th to 20th	Day	11% 4 8% 21% 28% 29%	2271
	21st to end	Day	14% 5% 9% 23% 29% 18%	2311
August	1st to 10th	Day	10% 3 3 13% 30% 40%	2135
	11th to 20th	Day	7% 2 4 16% 31% 39%	2122
	21st to end	Day	11% 3 4 11% 33% 38%	2376
September	1st to 10th	Day	13% 2 4 7% 34% 39%	2152
	11th to 20th	Day	9% 2 2 10% 36% 41%	1980
	21st to end	Day	12% 2 2 13% 32% 38%	1980
October	1st to 10th	Day	17% 4 5% 18% 23% 33%	1980
	11th to 20th	Day	18% 2 5% 11% 27% 38%	1967
	21st to end	Day	16% 3 4 12% 21% 44%	1886
November	1st to 10th	Day	17% 2 5% 17% 24% 35%	1674
	11th to 20th	Day	18% 3 6% 13% 21% 40%	1710
	21st to end	Day	24% 4 6% 13% 21% 32%	1710
December	1st to 10th	Day	25% 4 9% 15% 18% 29%	1710
	11th to 20th	Day	36% 7% 9% 11% 19% 18%	2168
	21st to end	Day	39% 7% 6% 19% 17% 13%	3146
January	1st to 10th	Night	23% 5% 5% 15% 30% 22%	4097
	11th to 20th	Night	28% 6% 10% 22% 17% 16%	3952
	21st to end	Night	37% 4 8% 9% 24% 19%	4180
February	1st to 10th	Night	27% 4 6% 13% 21% 28%	2280
	11th to 20th	Night	31% 4 6% 13% 22% 25%	2219
	21st to end	Night	36% 4 5% 15% 22% 18%	1884
March	1st to 10th	Night	36% 6% 6% 17% 16% 19%	2280
	11th to 20th	Night	29% 5% 8% 19% 22% 18%	2196
	21st to end	Night	28% 6% 10% 22% 21% 13%	2070
April	1st to 10th	Night	31% 5% 10% 22% 19% 14%	1800
	11th to 20th	Night	26% 6% 6% 20% 22% 20%	1779
	21st to end	Night	27% 4 8% 23% 24% 14%	1800
May	1st to 10th	Night	29% 6% 9% 19% 19% 19%	1684
	11th to 20th	Night	29% 5% 8% 24% 22% 13%	1595
	21st to end	Night	27% 5% 9% 25% 24% 9%	1746
June	1st to 10th	Night	22% 5% 9% 22% 27% 15%	1620
	11th to 20th	Night	15% 2 4 13% 33% 32%	1620
	21st to end	Night	13% 2 4 9% 30% 42%	1620
July	1st to 10th	Night	12% 2 2 11% 32% 41%	1575
	11th to 20th	Night	11% 4 8% 24% 28% 26%	1566
	21st to end	Night	16% 5% 10% 25% 29% 15%	1764
August	1st to 10th	Night	13% 2 4 16% 34% 30%	1780
	11th to 20th	Night	8% 3 3 19% 37% 30%	1780
	21st to end	Night	11% 3 4 13% 32% 37%	1980
September	1st to 10th	Night	17% 2 4 10% 30% 37%	1807
	11th to 20th	Night	12% 2 3 9% 32% 41%	1980
	21st to end	Night	12% 3 4 12% 35% 34%	1980
October	1st to 10th	Night	20% 4 5% 18% 23% 30%	1980
	11th to 20th	Night	19% 3 6% 12% 26% 34%	1988
	21st to end	Night	19% 3 4 10% 21% 43%	2467
November	1st to 10th	Night	18% 4 6% 16% 21% 36%	2405
	11th to 20th	Night	19% 3 5% 13% 21% 39%	2470
	21st to end	Night	27% 5% 7% 14% 16% 31%	2470
December	1st to 10th	Night	27% 4 7% 16% 17% 29%	2470
	11th to 20th	Night	35% 6% 8% 12% 21% 17%	3041
	21st to end	Night	37% 9% 8% 18% 16% 13%	4521

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	14% 3 14% 37% 27% 5%	270
	11th to 20th	Day	12% 5% 15% 33% 27% 7%	365
	21st to end	Day	10% 8% 23% 33% 22% 5%	506
February	1st to 10th	Day	11% 5% 26% 31% 20% 6%	460
	11th to 20th	Day	8% 11% 27% 32% 18% 5%	455
	21st to end	Day	12% 13% 23% 36% 14% 2	382
March	1st to 10th	Day	12% 12% 26% 31% 15% 4	460
	11th to 20th	Day	11% 9% 25% 32% 17% 6%	460
	21st to end	Day	6% 14% 30% 31% 16% 3	471
April	1st to 10th	Day	9% 9% 26% 29% 18% 8%	420
	11th to 20th	Day	3 14% 30% 31% 17% 5%	412
	21st to end	Day	4 11% 24% 34% 16% 12%	420
May	1st to 10th	Day	5% 11% 28% 32% 17% 7%	423
	11th to 20th	Day	4 9% 25% 34% 20% 8%	448
	21st to end	Day	6% 10% 22% 35% 19% 8%	485
June	1st to 10th	Day	3 4 16% 33% 31% 12%	450
	11th to 20th	Day	2 2 19% 35% 28% 14%	450
	21st to end	Day	3 1 13% 39% 30% 15%	450
July	1st to 10th	Day	2 1 7% 39% 33% 19%	446
	11th to 20th	Day	1 6% 38% 32% 23%	444
	21st to end	Day	2 1 5% 40% 33% 19%	487
August	1st to 10th	Day	2 1 10% 42% 31% 15%	447
	11th to 20th	Day	2 2 6% 40% 30% 20%	437
	21st to end	Day	2 1 6% 41% 30% 20%	495
September	1st to 10th	Day	2 2 14% 43% 26% 14%	450
	11th to 20th	Day	3 2 17% 41% 26% 11%	450
	21st to end	Day	2 5% 20% 34% 26% 13%	450
October	1st to 10th	Day	3 6% 22% 34% 27% 9%	450
	11th to 20th	Day	3 5% 18% 38% 28% 10%	450
	21st to end	Day	4 3 17% 34% 27% 14%	401
November	1st to 10th	Day	4 3 13% 33% 36% 11%	270
	11th to 20th	Day	3 1 11% 36% 36% 11%	270
	21st to end	Day	6% 6% 15% 38% 25% 11%	270
December	1st to 10th	Day	9% 2 13% 36% 31% 9%	270
	11th to 20th	Day	4 2 13% 39% 33% 9%	270
	21st to end	Day	17% 4 19% 32% 25% 3	297
January	1st to 10th	Night	8% 3 13% 41% 27% 8%	760
	11th to 20th	Night	9% 2 11% 44% 28% 7%	760
	21st to end	Night	12% 2 16% 39% 27% 4	836
February	1st to 10th	Night	10% 3 11% 42% 28% 7%	760
	11th to 20th	Night	9% 3 15% 40% 26% 7%	744
	21st to end	Night	14% 4 12% 43% 22% 5%	628
March	1st to 10th	Night	10% 4 14% 45% 24% 3	760
	11th to 20th	Night	10% 3 9% 40% 30% 8%	760
	21st to end	Night	8% 4 13% 41% 29% 5%	800
April	1st to 10th	Night	10% 2 12% 43% 28% 5%	720
	11th to 20th	Night	8% 4 14% 38% 31% 5%	711
	21st to end	Night	7% 4 10% 37% 35% 7%	720
May	1st to 10th	Night	5% 4 11% 40% 34% 6%	604
	11th to 20th	Night	4 4 11% 33% 39% 9%	531
	21st to end	Night	6% 5% 12% 38% 34% 4	584
June	1st to 10th	Night	3 2 9% 36% 43% 7%	540
	11th to 20th	Night	1 3 4 38% 49% 5%	540
	21st to end	Night	2 1 5% 31% 52% 8%	540
July	1st to 10th	Night	2 24% 61% 13%	525
	11th to 20th	Night	1 1 21% 62% 15%	522
	21st to end	Night	2 1 2 14% 62% 20%	686
August	1st to 10th	Night	2 2 22% 57% 17%	716
	11th to 20th	Night	1 1 13% 64% 21%	712
	21st to end	Night	1 1 1 14% 62% 22%	792
September	1st to 10th	Night	4 1 2 20% 57% 17%	720
	11th to 20th	Night	4 1 2 27% 52% 13%	720
	21st to end	Night	3 1 5% 31% 45% 15%	720
October	1st to 10th	Night	4 2 6% 39% 40% 9%	720
	11th to 20th	Night	5% 2 6% 36% 38% 13%	720
	21st to end	Night	4 2 9% 34% 33% 18%	792
November	1st to 10th	Night	4 2 6% 41% 35% 12%	740
	11th to 20th	Night	4 2 5% 42% 35% 11%	760
	21st to end	Night	6% 2 12% 40% 31% 9%	760
December	1st to 10th	Night	9% 3 10% 43% 28% 8%	760
	11th to 20th	Night	11% 3 12% 43% 26% 6%	760
	21st to end	Night	9% 3 15% 45% 20% 7%	836

Page generated at 2024-03-19 20:31:03. Version ac07

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