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 2024-11-12.

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% 70%	104968
	Night	6% 3 1 4 3 3 3 2 4 5% 68%	102956
Transparency	Day	19% 2 7% 18% 25% 28%	104720
	Night	21% 2 8% 20% 24% 25%	102793
Seeing	Day	5% 3 12% 25% 33% 22%	15407
	Night	6% 3 15% 40% 32% 4	24944

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	9% 11% 4 11% 8% 5% 4 4 5% 7% 32%	2539
	11th to 20th	Day	9% 8% 4 12% 7% 6% 5% 4 5% 7% 33%	2828
	21st to end	Day	14% 9% 4 9% 5% 6% 5% 4 6% 8% 28%	3146
February	1st to 10th	Day	12% 7% 2 5% 4 3 3 3 6% 6% 48%	1814
	11th to 20th	Day	8% 5% 2 5% 4 4 4 4 5% 7% 52%	1850
	21st to end	Day	11% 6% 2 5% 4 3 2 4 5% 6% 51%	1570
March	1st to 10th	Day	7% 6% 2 7% 4 5% 5% 5% 7% 9% 43%	3138
	11th to 20th	Day	5% 3 1 4 4 3 3 3 4 7% 64%	3453
	21st to end	Day	9% 5% 2 5% 4 4 5% 4 6% 7% 49%	4068
April	1st to 10th	Day	7% 4 2 3 3 3 3 3 5% 6% 62%	2280
	11th to 20th	Day	5% 4 1 4 3 3 3 3 4 5% 65%	2249
	21st to end	Day	4 2 1 2 2 2 3 2 5% 5% 72%	2280
May	1st to 10th	Day	3 1 1 2 1 1 1 1 2 3 83%	3821
	11th to 20th	Day	1 1 1 1 1 2 2 3 3 85%	4071
	21st to end	Day	2 1 1 1 1 1 1 2 3 86%	4781
June	1st to 10th	Day	2 1 1 2 2 2 2 2 3 6% 77%	2660
	11th to 20th	Day	1 1 1 1 1 1 2 3 90%	2660
	21st to end	Day	1 1 1 1 1 1 1 2 2 89%	2660
July	1st to 10th	Day	1 1 1 1 1 1 2 93%	4420
	11th to 20th	Day	1 1 2 1 1 2 1 3 3 84%	4398
	21st to end	Day	1 1 1 1 1 1 1 2 3 87%	4455
August	1st to 10th	Day	1 1 1 1 1 1 1 2 3 87%	3858
	11th to 20th	Day	1 1 1 1 1 2 94%	3724
	21st to end	Day	1 1 1 1 1 1 1 1 2 92%	4180
September	1st to 10th	Day	1 1 1 1 1 1 1 2 3 89%	2280
	11th to 20th	Day	1 1 1 1 1 2 1 2 3 87%	2235
	21st to end	Day	1 1 1 1 1 2 2 3 4 84%	2090
October	1st to 10th	Day	1 1 1 1 1 1 2 2 3 5% 80%	3287
	11th to 20th	Day	1 2 1 3 2 2 2 2 3 3 79%	3161
	21st to end	Day	2 2 1 4 2 3 3 3 4 7% 70%	3448
November	1st to 10th	Day	4 3 1 4 3 4 3 3 5% 7% 63%	1783
	11th to 20th	Day	7% 5% 2 4 3 4 3 3 5% 7% 56%	1719
	21st to end	Day	7% 5% 2 5% 4 3 5% 3 5% 7% 54%	1710
December	1st to 10th	Day	8% 10% 3 8% 5% 4 5% 3 5% 7% 42%	1630
	11th to 20th	Day	13% 9% 4 8% 6% 5% 5% 4 6% 7% 32%	1928
	21st to end	Day	12% 11% 4 11% 6% 6% 5% 4 6% 7% 28%	2794
January	1st to 10th	Night	13% 9% 2 8% 6% 5% 4 3 5% 6% 40%	4406
	11th to 20th	Night	10% 7% 3 9% 6% 5% 5% 3 5% 6% 40%	4139
	21st to end	Night	15% 7% 3 7% 4 4 4 4 6% 7% 39%	4521
February	1st to 10th	Night	11% 5% 1 5% 3 2 3 3 4 6% 57%	2363
	11th to 20th	Night	9% 4 1 3 3 3 3 3 5% 8% 59%	2218
	21st to end	Night	9% 5% 2 4 3 4 3 2 4 6% 58%	1884
March	1st to 10th	Night	8% 5% 2 5% 4 4 5% 4 6% 9% 49%	3736
	11th to 20th	Night	5% 2 1 3 2 3 3 3 5% 7% 64%	3524
	21st to end	Night	14% 6% 2 6% 5% 4 4 4 4 6% 47%	3583
April	1st to 10th	Night	6% 3 1 4 3 3 3 2 5% 6% 63%	1900
	11th to 20th	Night	4 4 1 3 2 2 3 2 4 5% 72%	1879
	21st to end	Night	3 2 1 2 2 2 2 2 3 7% 74%	1900
May	1st to 10th	Night	3 1 1 1 1 2 1 2 4 83%	3153
	11th to 20th	Night	2 1 1 1 1 1 1 3 4 85%	2834
	21st to end	Night	2 1 1 2 1 1 1 1 2 2 87%	2778
June	1st to 10th	Night	2 2 1 2 1 1 2 2 3 4 79%	1520
	11th to 20th	Night	1 1 1 1 1 1 1 3 90%	1520
	21st to end	Night	1 1 1 1 1 2 3 91%	1520
July	1st to 10th	Night	1 1 1 1 2 94%	2540
	11th to 20th	Night	1 1 2 1 1 1 1 2 3 87%	2559
	21st to end	Night	1 1 1 1 1 2 2 2 3 87%	3109
August	1st to 10th	Night	1 1 1 2 1 1 1 1 2 3 86%	3088
	11th to 20th	Night	1 1 1 1 1 2 2 92%	3126
	21st to end	Night	1 1 1 1 1 1 1 2 92%	3498
September	1st to 10th	Night	1 1 1 1 1 1 1 2 1 91%	1900
	11th to 20th	Night	1 1 1 1 1 1 1 2 3 87%	1943
	21st to end	Night	1 1 1 1 1 2 1 3 4 85%	2090
October	1st to 10th	Night	1 1 2 1 1 1 1 3 4 84%	3676
	11th to 20th	Night	1 1 1 2 1 2 2 2 3 3 82%	3777
	21st to end	Night	3 2 1 2 2 2 2 2 3 4 78%	4121
November	1st to 10th	Night	4 3 1 3 3 2 3 2 4 6% 68%	2514
	11th to 20th	Night	5% 3 1 3 2 3 3 3 4 6% 66%	2483
	21st to end	Night	5% 5% 2 5% 3 3 3 3 5% 6% 60%	2470
December	1st to 10th	Night	9% 6% 2 6% 3 4 4 3 5% 7% 52%	2546
	11th to 20th	Night	15% 7% 3 7% 5% 4 4 4 7% 8% 36%	3276
	21st to end	Night	12% 7% 3 8% 6% 6% 5% 4 5% 6% 36%	4862

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	52% 3 17% 22% 6% 1	2539
	11th to 20th	Day	52% 2 14% 19% 10% 3	2828
	21st to end	Day	55% 4 13% 17% 10% 2	3146
February	1st to 10th	Day	37% 3 10% 25% 18% 6%	1814
	11th to 20th	Day	31% 3 10% 29% 20% 6%	1860
	21st to end	Day	35% 3 14% 27% 18% 4	1570
March	1st to 10th	Day	37% 3 17% 24% 17% 3	3138
	11th to 20th	Day	22% 3 14% 33% 19% 9%	3453
	21st to end	Day	34% 3 13% 30% 17% 4	4068
April	1st to 10th	Day	24% 3 11% 30% 23% 9%	2280
	11th to 20th	Day	21% 2 12% 28% 27% 10%	2252
	21st to end	Day	16% 3 10% 32% 31% 9%	2280
May	1st to 10th	Day	10% 1 7% 23% 38% 21%	3821
	11th to 20th	Day	8% 1 4 22% 42% 23%	4074
	21st to end	Day	8% 1 4 25% 39% 23%	4781
June	1st to 10th	Day	11% 2 7% 21% 34% 25%	2660
	11th to 20th	Day	4 1 3 13% 38% 41%	2660
	21st to end	Day	6% 1 1 7% 27% 58%	2660
July	1st to 10th	Day	3 1 3 13% 80%	4351
	11th to 20th	Day	8% 1 1 5% 16% 69%	4323
	21st to end	Day	6% 1 1 6% 30% 56%	4315
August	1st to 10th	Day	7% 1 1 5% 31% 56%	3843
	11th to 20th	Day	3 1 5% 25% 66%	3760
	21st to end	Day	3 1 1 8% 29% 58%	4179
September	1st to 10th	Day	6% 1 2 6% 29% 55%	2280
	11th to 20th	Day	6% 2 2 18% 42% 31%	2235
	21st to end	Day	8% 1 1 17% 42% 31%	2090
October	1st to 10th	Day	9% 1 3 14% 26% 47%	3287
	11th to 20th	Day	13% 1 4 27% 36% 19%	3161
	21st to end	Day	16% 2 5% 21% 38% 19%	3448
November	1st to 10th	Day	22% 3 9% 29% 28% 9%	1783
	11th to 20th	Day	28% 3 14% 28% 23% 4	1719
	21st to end	Day	31% 4 8% 27% 22% 8%	1710
December	1st to 10th	Day	43% 4 10% 19% 17% 7%	1630
	11th to 20th	Day	50% 4 11% 21% 11% 3	1928
	21st to end	Day	55% 3 14% 19% 8% 1	2794
January	1st to 10th	Night	46% 3 13% 29% 9% 1	4406
	11th to 20th	Night	45% 3 17% 20% 10% 5%	4139
	21st to end	Night	45% 2 14% 23% 13% 3	4521
February	1st to 10th	Night	30% 3 10% 28% 21% 8%	2363
	11th to 20th	Night	26% 1 12% 28% 26% 7%	2219
	21st to end	Night	29% 2 12% 29% 22% 5%	1884
March	1st to 10th	Night	31% 3 17% 26% 19% 4	3736
	11th to 20th	Night	21% 3 14% 31% 24% 8%	3524
	21st to end	Night	40% 2 12% 26% 16% 4	3583
April	1st to 10th	Night	23% 2 10% 32% 22% 11%	1900
	11th to 20th	Night	17% 2 8% 31% 31% 10%	1879
	21st to end	Night	14% 2 9% 31% 35% 8%	1900
May	1st to 10th	Night	10% 1 6% 26% 34% 23%	3153
	11th to 20th	Night	8% 1 3 19% 46% 23%	2835
	21st to end	Night	8% 1 4 23% 43% 21%	2778
June	1st to 10th	Night	11% 1 6% 21% 33% 28%	1520
	11th to 20th	Night	4 1 3 13% 38% 41%	1520
	21st to end	Night	3 1 6% 27% 62%	1520
July	1st to 10th	Night	2 1 3 12% 82%	2500
	11th to 20th	Night	6% 1 2 4 13% 74%	2511
	21st to end	Night	6% 1 1 7% 25% 60%	3011
August	1st to 10th	Night	8% 1 1 5% 27% 58%	3079
	11th to 20th	Night	3 1 1 4 21% 71%	3156
	21st to end	Night	3 1 1 7% 23% 65%	3498
September	1st to 10th	Night	5% 1 1 6% 27% 60%	1900
	11th to 20th	Night	7% 1 2 15% 40% 35%	1943
	21st to end	Night	7% 1 1 15% 39% 36%	2090
October	1st to 10th	Night	8% 1 3 12% 22% 54%	3676
	11th to 20th	Night	9% 2 4 23% 39% 23%	3777
	21st to end	Night	13% 2 3 19% 42% 22%	4121
November	1st to 10th	Night	18% 2 8% 29% 29% 14%	2514
	11th to 20th	Night	20% 3 11% 28% 30% 8%	2483
	21st to end	Night	26% 2 9% 25% 28% 9%	2470
December	1st to 10th	Night	33% 4 11% 24% 18% 11%	2546
	11th to 20th	Night	45% 4 13% 20% 15% 3	3276
	21st to end	Night	48% 3 17% 21% 10% 2	4862

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	21% 7% 13% 29% 24% 6%	180
	11th to 20th	Day	11% 4 14% 25% 30% 15%	351
	21st to end	Day	14% 4 14% 22% 31% 15%	407
February	1st to 10th	Day	12% 5% 14% 25% 24% 19%	419
	11th to 20th	Day	11% 6% 16% 30% 23% 13%	455
	21st to end	Day	8% 8% 19% 31% 25% 8%	382
March	1st to 10th	Day	9% 8% 18% 30% 26% 9%	460
	11th to 20th	Day	9% 5% 22% 26% 25% 13%	460
	21st to end	Day	11% 8% 24% 28% 21% 9%	506
April	1st to 10th	Day	10% 5% 21% 25% 23% 16%	460
	11th to 20th	Day	8% 9% 19% 29% 23% 12%	452
	21st to end	Day	2 8% 19% 30% 22% 19%	460
May	1st to 10th	Day	2 5% 19% 32% 29% 13%	463
	11th to 20th	Day	2 3 13% 32% 31% 18%	488
	21st to end	Day	3 4 15% 23% 33% 22%	529
June	1st to 10th	Day	1 3 12% 28% 31% 26%	490
	11th to 20th	Day	1 2 13% 22% 40% 22%	490
	21st to end	Day	6% 26% 37% 31%	490
July	1st to 10th	Day	1 2 17% 47% 32%	486
	11th to 20th	Day	1 2 13% 33% 50%	484
	21st to end	Day	1 1 12% 47% 40%	531
August	1st to 10th	Day	3 5% 19% 41% 31%	487
	11th to 20th	Day	1 2 24% 41% 32%	477
	21st to end	Day	1 1 4 20% 40% 35%	539
September	1st to 10th	Day	1 1 3 22% 46% 27%	490
	11th to 20th	Day	1 1 8% 31% 41% 18%	490
	21st to end	Day	1 1 10% 22% 43% 23%	490
October	1st to 10th	Day	2 2 13% 28% 32% 23%	490
	11th to 20th	Day	2 4 12% 22% 36% 23%	490
	21st to end	Day	2 3 13% 22% 35% 24%	539
November	1st to 10th	Day	4 3 13% 24% 32% 24%	319
	11th to 20th	Day	5% 2 11% 20% 41% 21%	273
	21st to end	Day	7% 2 12% 28% 33% 19%	270
December	1st to 10th	Day	12% 3 14% 30% 27% 14%	232
	11th to 20th	Day	8% 4 13% 26% 28% 21%	180
	21st to end	Day	15% 6% 16% 25% 31% 8%	198
January	1st to 10th	Night	18% 3 10% 34% 30% 5%	760
	11th to 20th	Night	9% 1 9% 41% 33% 6%	760
	21st to end	Night	14% 2 12% 39% 29% 5%	836
February	1st to 10th	Night	13% 3 13% 34% 30% 7%	760
	11th to 20th	Night	9% 4 15% 37% 30% 4	744
	21st to end	Night	10% 3 17% 45% 22% 3	628
March	1st to 10th	Night	9% 6% 19% 38% 27% 2	760
	11th to 20th	Night	7% 4 18% 37% 29% 4	760
	21st to end	Night	9% 4 26% 39% 21% 1	836
April	1st to 10th	Night	7% 5% 27% 38% 21% 2	760
	11th to 20th	Night	5% 8% 25% 39% 23% 1	751
	21st to end	Night	3 6% 28% 37% 23% 3	760
May	1st to 10th	Night	3 4 27% 43% 22% 1	746
	11th to 20th	Night	4 3 28% 43% 22%	561
	21st to end	Night	3 6% 29% 42% 20%	427
June	1st to 10th	Night	3 6% 27% 49% 13% 1	380
	11th to 20th	Night	3 24% 54% 18% 1	380
	21st to end	Night	1 2 22% 54% 20% 1	380
July	1st to 10th	Night	14% 55% 31%	370
	11th to 20th	Night	1 9% 51% 37% 1	374
	21st to end	Night	1 7% 42% 45% 4	624
August	1st to 10th	Night	2 12% 44% 37% 4	703
	11th to 20th	Night	9% 46% 42% 3	752
	21st to end	Night	1 6% 35% 53% 5%	836
September	1st to 10th	Night	1 1 7% 42% 46% 4	760
	11th to 20th	Night	1 2 14% 42% 36% 4	760
	21st to end	Night	1 1 11% 38% 44% 5%	760
October	1st to 10th	Night	3 1 14% 39% 38% 5%	760
	11th to 20th	Night	3 2 10% 36% 41% 7%	760
	21st to end	Night	3 3 10% 33% 37% 14%	836
November	1st to 10th	Night	4 2 11% 34% 40% 9%	780
	11th to 20th	Night	5% 1 9% 40% 37% 8%	764
	21st to end	Night	7% 2 11% 38% 36% 5%	760
December	1st to 10th	Night	11% 2 12% 39% 30% 5%	760
	11th to 20th	Night	14% 2 10% 43% 25% 5%	760
	21st to end	Night	12% 3 16% 42% 25% 3	836

Page generated at 2024-11-08 19:45:38. Version ac07

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