Lamoria Springs Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lamoria Springs Observatory clear sky chart from 2005-11-06 to 2024-01-17.

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	13% 9% 4 7% 6% 4 5% 5% 6% 7% 33%	74661
	Night	15% 10% 4 7% 6% 3 5% 5% 5% 7% 34%	75163
Transparency	Day	49% 7% 12% 20% 11% 1	74370
	Night	49% 6% 12% 20% 11% 1	74975
Seeing	Day	16% 11% 30% 25% 14% 5%	14191
	Night	18% 10% 30% 29% 12% 1	23847

By Month

Percentage Cloud Cover SE (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	16% 14% 7% 12% 7% 4 5% 4 5% 5% 21%	1517
	11th to 20th	Day	15% 15% 9% 13% 9% 5% 4 4 5% 5% 17%	1488
	21st to end	Day	14% 15% 7% 10% 10% 5% 6% 5% 4 5% 19%	1751
February	1st to 10th	Day	13% 14% 6% 12% 9% 5% 6% 4 5% 5% 20%	1620
	11th to 20th	Day	13% 13% 6% 9% 9% 4 5% 5% 5% 6% 24%	1649
	21st to end	Day	15% 14% 6% 9% 9% 4 4 4 5% 5% 25%	1480
March	1st to 10th	Day	14% 10% 6% 9% 8% 4 5% 4 5% 7% 28%	1858
	11th to 20th	Day	12% 12% 5% 8% 7% 4 5% 5% 5% 7% 30%	1980
	21st to end	Day	16% 13% 5% 10% 7% 3 5% 4 4 5% 26%	2178
April	1st to 10th	Day	16% 11% 5% 8% 7% 3 5% 5% 5% 6% 28%	2071
	11th to 20th	Day	16% 10% 3 7% 5% 4 4 4 5% 8% 35%	2312
	21st to end	Day	16% 9% 3 9% 6% 3 4 5% 5% 7% 33%	2340
May	1st to 10th	Day	16% 8% 4 7% 6% 3 5% 5% 5% 7% 34%	2340
	11th to 20th	Day	17% 8% 4 7% 5% 3 4 4 5% 7% 36%	2301
	21st to end	Day	12% 7% 2 6% 5% 3 5% 5% 6% 8% 40%	2603
June	1st to 10th	Day	11% 6% 3 5% 5% 3 6% 5% 6% 10% 41%	2700
	11th to 20th	Day	9% 6% 3 6% 5% 4 5% 5% 6% 9% 42%	2700
	21st to end	Day	11% 5% 2 6% 6% 4 5% 5% 7% 10% 40%	2700
July	1st to 10th	Day	6% 5% 3 5% 5% 3 5% 5% 7% 9% 47%	2575
	11th to 20th	Day	9% 5% 3 4 5% 4 7% 7% 7% 10% 39%	2520
	21st to end	Day	8% 6% 3 5% 6% 4 6% 6% 7% 11% 40%	2594
August	1st to 10th	Day	9% 5% 3 6% 6% 4 6% 7% 7% 10% 38%	2327
	11th to 20th	Day	9% 6% 2 5% 7% 4 5% 6% 6% 10% 40%	2303
	21st to end	Day	11% 7% 3 5% 5% 3 5% 5% 6% 8% 41%	2574
September	1st to 10th	Day	10% 7% 2 6% 7% 4 5% 6% 6% 9% 38%	2052
	11th to 20th	Day	12% 5% 2 5% 5% 3 5% 4 7% 8% 44%	1980
	21st to end	Day	14% 7% 3 6% 6% 4 5% 5% 6% 9% 35%	1980
October	1st to 10th	Day	14% 6% 3 7% 6% 4 5% 4 5% 6% 38%	1900
	11th to 20th	Day	18% 10% 4 7% 7% 4 5% 5% 5% 7% 29%	1800
	21st to end	Day	21% 10% 4 7% 6% 4 5% 4 6% 7% 27%	1849
November	1st to 10th	Day	14% 10% 4 7% 7% 4 5% 5% 5% 8% 32%	1672
	11th to 20th	Day	13% 11% 4 10% 7% 4 5% 4 6% 7% 28%	1670
	21st to end	Day	16% 14% 4 9% 7% 4 5% 5% 5% 5% 27%	1520
December	1st to 10th	Day	13% 15% 7% 11% 8% 5% 6% 5% 5% 6% 20%	1520
	11th to 20th	Day	17% 14% 6% 8% 6% 3 5% 5% 5% 6% 24%	1742
	21st to end	Day	25% 21% 8% 10% 6% 3 4 4 4 4 11%	2495
January	1st to 10th	Night	17% 12% 5% 10% 7% 5% 4 5% 5% 6% 25%	2648
	11th to 20th	Night	16% 15% 7% 11% 8% 4 5% 4 4 5% 20%	2611
	21st to end	Night	11% 13% 9% 11% 8% 4 4 4 5% 6% 25%	2601
February	1st to 10th	Night	16% 14% 6% 10% 7% 4 5% 4 5% 5% 23%	2340
	11th to 20th	Night	14% 14% 5% 9% 6% 3 5% 6% 6% 6% 26%	2193
	21st to end	Night	17% 12% 4 9% 8% 3 5% 4 4 5% 27%	1776
March	1st to 10th	Night	14% 11% 5% 8% 6% 3 5% 4 4 6% 33%	2102
	11th to 20th	Night	11% 8% 4 7% 7% 3 5% 5% 6% 8% 37%	1980
	21st to end	Night	18% 10% 4 7% 6% 3 5% 4 4 5% 33%	2178
April	1st to 10th	Night	17% 9% 5% 6% 5% 2 5% 4 5% 7% 35%	1904
	11th to 20th	Night	17% 7% 3 5% 5% 3 5% 5% 5% 7% 39%	1597
	21st to end	Night	17% 9% 3 6% 6% 3 4 4 5% 7% 36%	1620
May	1st to 10th	Night	14% 9% 4 6% 6% 4 5% 5% 5% 8% 34%	1620
	11th to 20th	Night	17% 8% 3 5% 5% 3 4 4 4 6% 41%	1592
	21st to end	Night	10% 4 2 5% 5% 3 4 5% 5% 9% 48%	1664
June	1st to 10th	Night	12% 4 2 6% 4 3 5% 6% 5% 8% 44%	1260
	11th to 20th	Night	11% 5% 2 4 5% 3 4 5% 7% 9% 45%	1260
	21st to end	Night	7% 5% 3 5% 5% 3 5% 5% 6% 9% 47%	1260
July	1st to 10th	Night	6% 4 2 5% 4 3 4 4 5% 8% 55%	1379
	11th to 20th	Night	9% 4 2 5% 4 4 4 5% 6% 9% 50%	1440
	21st to end	Night	6% 3 2 4 6% 4 5% 6% 7% 8% 49%	1723
August	1st to 10th	Night	7% 5% 2 4 6% 3 5% 5% 6% 10% 48%	1611
	11th to 20th	Night	7% 4 2 5% 5% 4 4 6% 7% 9% 49%	1598
	21st to end	Night	9% 5% 2 5% 5% 2 4 4 5% 7% 50%	1782
September	1st to 10th	Night	10% 6% 2 6% 5% 3 4 4 7% 7% 45%	1887
	11th to 20th	Night	10% 4 2 4 4 2 4 5% 5% 8% 53%	1980
	21st to end	Night	14% 6% 3 6% 5% 3 3 4 5% 6% 44%	1980
October	1st to 10th	Night	16% 6% 3 6% 4 2 3 4 6% 7% 42%	2059
	11th to 20th	Night	19% 9% 3 6% 5% 4 5% 4 5% 6% 34%	2160
	21st to end	Night	21% 10% 3 7% 7% 3 4 5% 5% 6% 29%	2506
November	1st to 10th	Night	13% 8% 3 6% 5% 3 4 5% 7% 6% 41%	2406
	11th to 20th	Night	14% 11% 4 8% 6% 4 5% 6% 6% 7% 29%	2508
	21st to end	Night	19% 13% 4 7% 6% 3 4 5% 5% 7% 28%	2660
December	1st to 10th	Night	17% 14% 6% 9% 6% 3 5% 6% 6% 6% 21%	2660
	11th to 20th	Night	14% 13% 6% 10% 7% 4 6% 6% 5% 6% 23%	3450
	21st to end	Night	25% 21% 8% 9% 7% 3 4 4 3 4 14%	5168

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	64% 5% 11% 13% 5% 1	1518
	11th to 20th	Day	69% 7% 10% 10% 4	1488
	21st to end	Day	67% 6% 8% 12% 6% 1	1751
February	1st to 10th	Day	65% 5% 11% 13% 5%	1620
	11th to 20th	Day	60% 6% 10% 15% 9% 1	1658
	21st to end	Day	60% 6% 9% 15% 8% 1	1480
March	1st to 10th	Day	57% 5% 12% 16% 9% 1	1858
	11th to 20th	Day	53% 6% 10% 17% 11% 3	1980
	21st to end	Day	59% 4 11% 17% 7% 1	2178
April	1st to 10th	Day	55% 5% 11% 18% 10% 1	2071
	11th to 20th	Day	48% 6% 13% 18% 14% 2	2312
	21st to end	Day	50% 6% 14% 17% 12% 2	2340
May	1st to 10th	Day	48% 6% 11% 22% 11% 2	2340
	11th to 20th	Day	46% 7% 11% 19% 15% 2	2305
	21st to end	Day	41% 7% 13% 22% 16% 3	2603
June	1st to 10th	Day	38% 7% 13% 25% 15% 2	2700
	11th to 20th	Day	38% 7% 12% 23% 17% 2	2700
	21st to end	Day	38% 8% 13% 25% 15% 1	2700
July	1st to 10th	Day	32% 8% 12% 27% 17% 4	2506
	11th to 20th	Day	35% 9% 15% 25% 14% 2	2445
	21st to end	Day	36% 9% 14% 21% 17% 3	2450
August	1st to 10th	Day	37% 11% 15% 24% 12% 1	2314
	11th to 20th	Day	37% 9% 14% 25% 13% 2	2303
	21st to end	Day	39% 7% 12% 27% 14% 1	2574
September	1st to 10th	Day	41% 9% 15% 22% 12% 1	2052
	11th to 20th	Day	36% 7% 13% 32% 12% 1	1980
	21st to end	Day	45% 8% 14% 23% 9% 1	1980
October	1st to 10th	Day	45% 6% 12% 24% 12% 2	1900
	11th to 20th	Day	53% 7% 12% 19% 8% 1	1800
	21st to end	Day	56% 7% 13% 17% 7%	1849
November	1st to 10th	Day	50% 7% 12% 21% 10% 1	1672
	11th to 20th	Day	54% 7% 14% 15% 9%	1670
	21st to end	Day	59% 6% 14% 16% 5% 1	1520
December	1st to 10th	Day	65% 7% 13% 12% 4	1520
	11th to 20th	Day	60% 6% 14% 16% 4	1738
	21st to end	Day	76% 6% 9% 7% 2	2495
January	1st to 10th	Night	59% 5% 13% 15% 8%	2648
	11th to 20th	Night	66% 7% 11% 12% 5%	2611
	21st to end	Night	60% 5% 11% 18% 5%	2601
February	1st to 10th	Night	62% 6% 10% 15% 7% 1	2340
	11th to 20th	Night	57% 6% 10% 17% 10% 1	2195
	21st to end	Night	59% 5% 9% 18% 8% 1	1776
March	1st to 10th	Night	52% 5% 11% 22% 9% 1	2102
	11th to 20th	Night	46% 5% 11% 23% 13% 2	1980
	21st to end	Night	52% 5% 10% 21% 11% 1	2178
April	1st to 10th	Night	48% 6% 10% 21% 13% 2	1904
	11th to 20th	Night	44% 5% 11% 18% 20% 2	1597
	21st to end	Night	46% 7% 10% 18% 15% 3	1620
May	1st to 10th	Night	47% 7% 10% 22% 12% 3	1620
	11th to 20th	Night	43% 5% 9% 20% 18% 4	1593
	21st to end	Night	33% 8% 13% 26% 16% 4	1665
June	1st to 10th	Night	36% 7% 12% 25% 17% 2	1260
	11th to 20th	Night	34% 8% 14% 23% 19% 3	1260
	21st to end	Night	33% 7% 15% 26% 19% 2	1260
July	1st to 10th	Night	26% 7% 12% 29% 22% 5%	1339
	11th to 20th	Night	30% 8% 14% 30% 17% 2	1392
	21st to end	Night	30% 8% 18% 22% 18% 3	1627
August	1st to 10th	Night	30% 8% 16% 30% 14% 1	1600
	11th to 20th	Night	30% 9% 15% 30% 14% 3	1598
	21st to end	Night	33% 6% 13% 31% 16% 1	1782
September	1st to 10th	Night	36% 7% 13% 28% 14% 2	1887
	11th to 20th	Night	29% 7% 13% 33% 17% 1	1980
	21st to end	Night	40% 6% 12% 29% 12% 1	1980
October	1st to 10th	Night	40% 8% 11% 25% 16% 1	2059
	11th to 20th	Night	50% 6% 12% 22% 9% 1	2160
	21st to end	Night	56% 6% 11% 18% 9% 1	2506
November	1st to 10th	Night	41% 6% 13% 26% 12% 1	2406
	11th to 20th	Night	53% 7% 13% 18% 7% 1	2508
	21st to end	Night	56% 6% 15% 17% 6%	2660
December	1st to 10th	Night	62% 6% 13% 15% 4	2660
	11th to 20th	Night	58% 8% 13% 14% 6%	3453
	21st to end	Night	74% 6% 10% 7% 3	5168

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	22% 17% 36% 20% 5%	270
	11th to 20th	Day	19% 15% 43% 17% 4 2	258
	21st to end	Day	23% 14% 38% 20% 5% 1	264
February	1st to 10th	Day	22% 21% 40% 14% 3	240
	11th to 20th	Day	20% 18% 46% 15% 1	240
	21st to end	Day	20% 31% 34% 14% 2	198
March	1st to 10th	Day	24% 14% 41% 15% 5%	298
	11th to 20th	Day	19% 16% 32% 23% 9% 1	420
	21st to end	Day	25% 12% 33% 21% 7% 1	462
April	1st to 10th	Day	16% 17% 35% 22% 9% 1	420
	11th to 20th	Day	24% 15% 28% 17% 11% 5%	412
	21st to end	Day	20% 13% 29% 25% 11% 1	420
May	1st to 10th	Day	18% 13% 32% 23% 11% 3	423
	11th to 20th	Day	17% 8% 30% 24% 14% 6%	447
	21st to end	Day	14% 7% 24% 29% 19% 7%	485
June	1st to 10th	Day	12% 7% 32% 31% 13% 4	630
	11th to 20th	Day	12% 8% 30% 29% 16% 5%	630
	21st to end	Day	12% 5% 29% 33% 16% 4	630
July	1st to 10th	Day	7% 5% 22% 33% 23% 10%	621
	11th to 20th	Day	11% 5% 26% 32% 19% 7%	618
	21st to end	Day	8% 4 25% 32% 23% 9%	535
August	1st to 10th	Day	9% 4 20% 30% 24% 13%	446
	11th to 20th	Day	10% 4 17% 33% 22% 14%	439
	21st to end	Day	13% 4 22% 26% 25% 10%	495
September	1st to 10th	Day	12% 5% 24% 27% 22% 10%	450
	11th to 20th	Day	10% 4 19% 26% 27% 14%	450
	21st to end	Day	13% 13% 24% 24% 17% 10%	450
October	1st to 10th	Day	17% 9% 29% 21% 18% 6%	450
	11th to 20th	Day	18% 19% 31% 25% 6% 1	450
	21st to end	Day	22% 20% 34% 20% 4 1	364
November	1st to 10th	Day	17% 19% 33% 22% 9% 1	270
	11th to 20th	Day	18% 20% 38% 16% 7% 1	250
	21st to end	Day	22% 19% 37% 18% 4	180
December	1st to 10th	Day	23% 17% 37% 16% 7% 1	180
	11th to 20th	Day	26% 18% 39% 14% 2 1	180
	21st to end	Day	25% 20% 36% 17% 3	216
January	1st to 10th	Night	20% 17% 37% 19% 6% 1	950
	11th to 20th	Night	21% 16% 37% 22% 4 1	933
	21st to end	Night	18% 10% 37% 28% 7%	819
February	1st to 10th	Night	23% 14% 40% 20% 3	720
	11th to 20th	Night	22% 15% 32% 25% 6%	703
	21st to end	Night	22% 16% 39% 21% 3	592
March	1st to 10th	Night	19% 12% 34% 28% 7%	720
	11th to 20th	Night	16% 12% 38% 26% 7% 1	720
	21st to end	Night	22% 12% 29% 30% 7% 1	792
April	1st to 10th	Night	22% 12% 33% 27% 5%	648
	11th to 20th	Night	21% 9% 33% 25% 9% 2	533
	21st to end	Night	21% 6% 31% 32% 9% 1	540
May	1st to 10th	Night	17% 6% 29% 35% 12% 1	540
	11th to 20th	Night	19% 4 27% 36% 13% 1	531
	21st to end	Night	12% 3 26% 35% 22% 2	508
June	1st to 10th	Night	14% 4 26% 41% 16%	360
	11th to 20th	Night	14% 4 27% 38% 17%	360
	21st to end	Night	9% 6% 23% 44% 18% 1	360
July	1st to 10th	Night	7% 1 16% 44% 28% 3	464
	11th to 20th	Night	10% 2 17% 43% 24% 4	522
	21st to end	Night	7% 2 18% 48% 24% 1	591
August	1st to 10th	Night	8% 1 14% 45% 28% 4	537
	11th to 20th	Night	8% 1 18% 37% 32% 4	534
	21st to end	Night	12% 3 19% 36% 27% 4	594
September	1st to 10th	Night	11% 6% 22% 35% 21% 5%	661
	11th to 20th	Night	11% 4 17% 36% 27% 5%	720
	21st to end	Night	15% 7% 23% 31% 19% 5%	720
October	1st to 10th	Night	18% 6% 28% 26% 20% 2	720
	11th to 20th	Night	22% 13% 32% 25% 8% 1	720
	21st to end	Night	25% 12% 34% 25% 4	792
November	1st to 10th	Night	19% 11% 32% 27% 10% 1	740
	11th to 20th	Night	19% 15% 38% 21% 6% 1	760
	21st to end	Night	24% 15% 35% 21% 5%	760
December	1st to 10th	Night	24% 15% 38% 18% 5%	760
	11th to 20th	Night	23% 15% 39% 20% 3	878
	21st to end	Night	29% 13% 35% 21% 2	1045

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