Lemoore
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lemoore clear sky chart from 2005-11-06 to 2026-01-02.

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 1 3 2 2 3 2 3 5% 71%	135479
	Night	5% 3 1 4 3 3 3 2 4 5% 68%	133326
Transparency	Day	19% 2 7% 19% 27% 27%	130517
	Night	22% 2 8% 20% 26% 23%	129263
Seeing	Day	5% 3 12% 25% 33% 22%	16862
	Night	6% 3 15% 40% 31% 4	26463

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% 9% 3 11% 7% 5% 4 4 5% 8% 38%	3647
	11th to 20th	Day	6% 6% 3 9% 6% 5% 4 3 4 5% 50%	4054
	21st to end	Day	11% 7% 3 7% 5% 5% 5% 4 6% 8% 39%	4510
February	1st to 10th	Day	12% 7% 2 5% 4 3 4 3 6% 6% 47%	1910
	11th to 20th	Day	8% 5% 2 5% 4 4 4 4 6% 7% 52%	1950
	21st to end	Day	11% 6% 2 6% 4 3 2 4 5% 6% 50%	1650
March	1st to 10th	Day	9% 6% 2 6% 3 5% 5% 5% 7% 9% 43%	4518
	11th to 20th	Day	7% 4 2 5% 5% 4 4 4 4 7% 55%	4950
	21st to end	Day	8% 4 2 5% 4 4 5% 4 6% 8% 51%	5833
April	1st to 10th	Day	6% 4 1 3 3 3 3 3 5% 6% 62%	2400
	11th to 20th	Day	5% 3 1 4 3 3 3 3 4 5% 65%	2369
	21st to end	Day	4 2 1 2 2 2 3 2 5% 5% 71%	2400
May	1st to 10th	Day	3 1 1 2 1 1 1 1 2 3 83%	5474
	11th to 20th	Day	1 1 1 1 1 2 2 3 3 85%	5841
	21st to end	Day	1 1 1 1 1 1 1 2 3 87%	6857
June	1st to 10th	Day	2 1 1 2 2 2 2 2 3 6% 78%	2800
	11th to 20th	Day	1 1 1 1 1 1 2 3 90%	2800
	21st to end	Day	1 1 1 1 1 1 1 2 2 89%	2800
July	1st to 10th	Day	1 1 1 95%	6319
	11th to 20th	Day	1 1 1 1 1 1 1 2 2 89%	6285
	21st to end	Day	1 1 1 1 1 1 2 4 88%	6402
August	1st to 10th	Day	1 1 1 1 1 1 1 1 3 90%	5460
	11th to 20th	Day	1 1 96%	5364
	21st to end	Day	1 1 1 1 1 1 1 2 3 89%	5984
September	1st to 10th	Day	1 1 1 1 1 1 1 2 3 89%	2400
	11th to 20th	Day	1 1 1 1 1 2 1 2 3 86%	2352
	21st to end	Day	1 1 1 2 2 1 2 2 3 4 83%	2200
October	1st to 10th	Day	1 1 1 1 1 1 2 2 3 5% 81%	3391
	11th to 20th	Day	2 2 1 3 2 2 2 2 3 3 79%	3261
	21st to end	Day	2 2 1 4 2 3 3 3 4 7% 70%	3558
November	1st to 10th	Day	4 3 1 4 3 4 3 3 5% 7% 62%	1874
	11th to 20th	Day	9% 6% 1 4 3 4 3 3 5% 7% 55%	1890
	21st to end	Day	7% 7% 2 6% 4 4 4 3 5% 7% 51%	1890
December	1st to 10th	Day	5% 7% 3 9% 7% 6% 7% 4 5% 8% 39%	2886
	11th to 20th	Day	10% 8% 4 9% 7% 6% 6% 4 7% 8% 31%	3108
	21st to end	Day	12% 10% 4 12% 6% 6% 6% 4 6% 8% 27%	4092
January	1st to 10th	Night	10% 7% 2 7% 5% 5% 4 3 5% 7% 44%	6320
	11th to 20th	Night	7% 5% 2 6% 4 4 4 2 4 5% 57%	5909
	21st to end	Night	11% 6% 2 6% 4 4 4 3 5% 6% 48%	6468
February	1st to 10th	Night	11% 5% 1 5% 4 2 3 3 4 6% 56%	2487
	11th to 20th	Night	10% 4 1 3 3 3 3 3 5% 8% 58%	2338
	21st to end	Night	9% 4 2 4 3 4 3 2 4 6% 59%	1980
March	1st to 10th	Night	8% 5% 2 6% 3 4 4 4 7% 9% 47%	5376
	11th to 20th	Night	7% 3 2 5% 3 4 4 4 5% 7% 57%	5047
	21st to end	Night	12% 6% 2 6% 4 4 4 4 4 6% 51%	5140
April	1st to 10th	Night	6% 3 1 4 3 3 3 3 5% 6% 64%	2000
	11th to 20th	Night	4 4 1 3 2 2 3 2 4 5% 71%	1979
	21st to end	Night	3 3 1 2 2 2 2 2 3 7% 73%	2000
May	1st to 10th	Night	3 1 1 2 1 2 2 2 2 4 81%	4519
	11th to 20th	Night	2 1 1 1 1 1 1 2 4 85%	4074
	21st to end	Night	1 1 1 1 1 1 1 1 2 90%	4002
June	1st to 10th	Night	2 2 1 2 1 1 2 2 3 4 80%	1600
	11th to 20th	Night	1 1 1 1 1 1 1 3 90%	1600
	21st to end	Night	1 1 1 1 1 1 3 92%	1600
July	1st to 10th	Night	1 1 1 2 95%	3640
	11th to 20th	Night	1 1 1 1 1 1 1 2 2 91%	3673
	21st to end	Night	1 1 1 1 2 2 3 89%	4472
August	1st to 10th	Night	1 1 1 1 1 1 1 2 2 89%	4366
	11th to 20th	Night	1 1 1 95%	4506
	21st to end	Night	1 1 1 1 2 1 2 3 88%	5015
September	1st to 10th	Night	1 1 1 1 1 1 1 2 1 91%	2000
	11th to 20th	Night	2 1 2 1 1 1 1 2 3 86%	2046
	21st to end	Night	1 1 1 1 1 2 1 3 4 84%	2200
October	1st to 10th	Night	1 1 2 1 1 1 1 3 4 84%	3792
	11th to 20th	Night	2 1 1 2 1 2 2 2 3 3 82%	3897
	21st to end	Night	3 2 1 2 2 2 2 2 3 4 78%	4253
November	1st to 10th	Night	4 3 1 3 3 2 3 2 4 6% 69%	2643
	11th to 20th	Night	6% 3 1 4 2 3 3 3 5% 6% 64%	2730
	21st to end	Night	6% 6% 2 5% 4 3 3 3 5% 6% 58%	2730
December	1st to 10th	Night	5% 5% 2 5% 4 5% 6% 4 5% 7% 52%	4502
	11th to 20th	Night	11% 6% 3 8% 6% 5% 5% 4 7% 9% 36%	5316
	21st to end	Night	10% 7% 3 10% 7% 7% 6% 5% 6% 8% 32%	7106

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	46% 3 18% 20% 12% 1	3647
	11th to 20th	Day	38% 2 10% 17% 22% 12%	4054
	21st to end	Day	43% 3 11% 15% 23% 5%	4510
February	1st to 10th	Day	37% 3 10% 26% 18% 6%	1910
	11th to 20th	Day	31% 3 11% 30% 19% 6%	1960
	21st to end	Day	35% 2 13% 28% 17% 4	1650
March	1st to 10th	Day	35% 3 15% 23% 21% 3	4518
	11th to 20th	Day	29% 4 14% 32% 15% 7%	4950
	21st to end	Day	31% 3 12% 35% 15% 3	5833
April	1st to 10th	Day	24% 3 11% 31% 24% 8%	2400
	11th to 20th	Day	21% 2 12% 28% 27% 9%	2372
	21st to end	Day	16% 3 10% 32% 30% 8%	2400
May	1st to 10th	Day	10% 1 7% 23% 40% 19%	5474
	11th to 20th	Day	8% 1 4 26% 43% 18%	5844
	21st to end	Day	6% 1 3 21% 47% 21%	6858
June	1st to 10th	Day	11% 2 6% 22% 35% 25%	2800
	11th to 20th	Day	4 1 3 13% 37% 43%	2800
	21st to end	Day	6% 1 1 7% 27% 58%	2800
July	1st to 10th	Day	2 3 15% 79%	6251
	11th to 20th	Day	5% 1 1 3 18% 72%	6210
	21st to end	Day	4 1 1 11% 36% 47%	6217
August	1st to 10th	Day	6% 1 1 5% 31% 56%	3966
	11th to 20th	Day	3 1 5% 25% 66%	3880
	21st to end	Day	4 1 1 8% 29% 57%	4311
September	1st to 10th	Day	6% 1 2 8% 31% 53%	2400
	11th to 20th	Day	7% 2 2 18% 42% 30%	2352
	21st to end	Day	8% 1 2 18% 41% 30%	2200
October	1st to 10th	Day	9% 1 3 14% 26% 46%	3391
	11th to 20th	Day	13% 2 4 27% 36% 18%	3261
	21st to end	Day	16% 2 5% 21% 38% 18%	3558
November	1st to 10th	Day	21% 3 9% 30% 28% 9%	1874
	11th to 20th	Day	30% 3 14% 28% 22% 4	1890
	21st to end	Day	34% 4 8% 26% 21% 8%	1890
December	1st to 10th	Day	44% 4 9% 23% 16% 4	2886
	11th to 20th	Day	49% 5% 10% 22% 12% 2	3108
	21st to end	Day	56% 3 16% 18% 6% 1	4092
January	1st to 10th	Night	40% 3 16% 27% 13% 1	6320
	11th to 20th	Night	32% 2 12% 17% 27% 10%	5909
	21st to end	Night	38% 2 10% 22% 21% 7%	6468
February	1st to 10th	Night	31% 3 10% 28% 21% 8%	2487
	11th to 20th	Night	26% 2 12% 28% 25% 7%	2339
	21st to end	Night	28% 2 12% 30% 22% 6%	1980
March	1st to 10th	Night	33% 3 14% 24% 23% 3	5376
	11th to 20th	Night	27% 3 14% 32% 18% 6%	5047
	21st to end	Night	37% 2 13% 28% 17% 3	5140
April	1st to 10th	Night	23% 3 10% 31% 23% 10%	2000
	11th to 20th	Night	18% 2 8% 31% 31% 10%	1979
	21st to end	Night	15% 2 9% 31% 35% 8%	2000
May	1st to 10th	Night	11% 2 7% 26% 35% 20%	4516
	11th to 20th	Night	8% 1 2 22% 48% 18%	4075
	21st to end	Night	6% 1 2 18% 51% 22%	4002
June	1st to 10th	Night	11% 1 6% 21% 35% 28%	1600
	11th to 20th	Night	4 1 3 12% 37% 43%	1600
	21st to end	Night	3 1 6% 27% 63%	1600
July	1st to 10th	Night	2 2 13% 83%	3600
	11th to 20th	Night	4 1 1 3 14% 77%	3625
	21st to end	Night	4 1 1 10% 34% 50%	4345
August	1st to 10th	Night	8% 1 1 5% 27% 59%	3176
	11th to 20th	Night	3 1 1 4 21% 71%	3256
	21st to end	Night	4 1 1 7% 24% 64%	3608
September	1st to 10th	Night	5% 1 1 7% 28% 58%	2000
	11th to 20th	Night	8% 1 2 15% 41% 34%	2046
	21st to end	Night	8% 1 2 16% 38% 36%	2200
October	1st to 10th	Night	8% 1 2 12% 23% 54%	3792
	11th to 20th	Night	10% 2 4 23% 39% 23%	3897
	21st to end	Night	13% 2 4 19% 41% 22%	4253
November	1st to 10th	Night	18% 2 7% 30% 30% 13%	2643
	11th to 20th	Night	22% 3 11% 28% 29% 8%	2730
	21st to end	Night	29% 3 9% 25% 27% 8%	2730
December	1st to 10th	Night	32% 4 11% 28% 19% 6%	4502
	11th to 20th	Night	44% 4 16% 18% 15% 3	5316
	21st to end	Night	49% 4 18% 20% 7% 1	7106

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	19% 6% 13% 31% 23% 6%	202
	11th to 20th	Day	11% 4 14% 26% 30% 15%	380
	21st to end	Day	13% 3 15% 23% 31% 15%	440
February	1st to 10th	Day	12% 6% 15% 25% 24% 18%	455
	11th to 20th	Day	11% 7% 16% 32% 23% 12%	495
	21st to end	Day	8% 7% 19% 31% 26% 9%	414
March	1st to 10th	Day	10% 8% 18% 30% 26% 9%	500
	11th to 20th	Day	9% 6% 22% 26% 24% 12%	500
	21st to end	Day	10% 7% 24% 28% 20% 10%	550
April	1st to 10th	Day	9% 5% 21% 27% 23% 16%	500
	11th to 20th	Day	7% 8% 18% 30% 24% 12%	492
	21st to end	Day	2 8% 18% 29% 22% 20%	500
May	1st to 10th	Day	3 5% 19% 31% 28% 14%	503
	11th to 20th	Day	2 4 14% 33% 30% 17%	528
	21st to end	Day	3 4 15% 25% 33% 21%	573
June	1st to 10th	Day	1 2 11% 27% 32% 26%	530
	11th to 20th	Day	1 2 13% 24% 40% 20%	530
	21st to end	Day	1 7% 24% 37% 31%	530
July	1st to 10th	Day	1 3 17% 48% 31%	526
	11th to 20th	Day	1 2 12% 34% 51%	524
	21st to end	Day	1 1 12% 47% 39%	575
August	1st to 10th	Day	3 5% 20% 41% 31%	527
	11th to 20th	Day	1 2 23% 41% 33%	517
	21st to end	Day	1 1 4 20% 40% 34%	583
September	1st to 10th	Day	1 1 3 22% 46% 27%	530
	11th to 20th	Day	2 2 8% 30% 40% 19%	530
	21st to end	Day	1 2 11% 22% 43% 22%	530
October	1st to 10th	Day	2 2 13% 27% 33% 23%	530
	11th to 20th	Day	2 5% 12% 22% 35% 23%	530
	21st to end	Day	2 3 13% 23% 35% 24%	583
November	1st to 10th	Day	4 3 12% 23% 31% 27%	350
	11th to 20th	Day	9% 3 10% 24% 36% 18%	330
	21st to end	Day	10% 3 12% 25% 32% 18%	330
December	1st to 10th	Day	11% 2 12% 27% 29% 18%	283
	11th to 20th	Day	8% 4 11% 25% 30% 21%	220
	21st to end	Day	15% 6% 17% 26% 29% 6%	242
January	1st to 10th	Night	17% 3 11% 35% 29% 5%	804
	11th to 20th	Night	9% 1 10% 42% 32% 5%	800
	21st to end	Night	13% 3 12% 39% 29% 5%	880
February	1st to 10th	Night	13% 3 14% 36% 28% 7%	800
	11th to 20th	Night	9% 5% 16% 37% 29% 4	784
	21st to end	Night	10% 3 17% 44% 23% 3	660
March	1st to 10th	Night	9% 6% 19% 38% 26% 2	800
	11th to 20th	Night	8% 5% 19% 37% 28% 4	800
	21st to end	Night	9% 4 25% 39% 20% 2	880
April	1st to 10th	Night	7% 5% 28% 38% 21% 2	800
	11th to 20th	Night	5% 7% 25% 40% 22% 1	791
	21st to end	Night	3 6% 28% 38% 23% 3	800
May	1st to 10th	Night	3 4 27% 43% 22% 1	785
	11th to 20th	Night	4 4 28% 43% 21%	591
	21st to end	Night	3 6% 29% 42% 19%	450
June	1st to 10th	Night	3 6% 26% 51% 14% 1	400
	11th to 20th	Night	3 26% 53% 18% 1	400
	21st to end	Night	1 2 21% 54% 20% 1	400
July	1st to 10th	Night	14% 56% 29%	390
	11th to 20th	Night	1 9% 51% 38% 1	395
	21st to end	Night	1 8% 43% 44% 4	657
August	1st to 10th	Night	2 13% 44% 37% 4	740
	11th to 20th	Night	10% 46% 41% 3	792
	21st to end	Night	1 6% 36% 53% 5%	880
September	1st to 10th	Night	1 1 7% 42% 45% 4	800
	11th to 20th	Night	2 2 14% 42% 36% 5%	800
	21st to end	Night	1 2 12% 39% 42% 4	800
October	1st to 10th	Night	3 2 14% 39% 38% 5%	800
	11th to 20th	Night	3 2 11% 36% 40% 7%	800
	21st to end	Night	3 3 10% 33% 37% 14%	880
November	1st to 10th	Night	4 2 10% 34% 40% 9%	820
	11th to 20th	Night	6% 2 10% 41% 35% 7%	840
	21st to end	Night	7% 3 12% 38% 35% 5%	840
December	1st to 10th	Night	10% 3 12% 39% 31% 6%	840
	11th to 20th	Night	13% 2 10% 42% 26% 6%	840
	21st to end	Night	11% 4 17% 42% 24% 3	924

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