Moose Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moose Springs clear sky chart from 2005-11-06 to 2024-02-25.

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 10% 4 8% 6% 3 4 4 5% 6% 45%	78571
	Night	3 9% 4 8% 6% 3 4 4 5% 7% 46%	80761
Transparency	Day	37% 6% 11% 19% 18% 9%	78296
	Night	35% 6% 13% 21% 18% 8%	80557
Seeing	Day	12% 19% 33% 24% 10% 2	14142
	Night	8% 10% 28% 34% 18% 2	24583

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	2 10% 8% 17% 10% 4 4 4 5% 5% 30%	2858
	11th to 20th	Day	2 16% 9% 14% 12% 3 3 3 4 4 29%	2860
	21st to end	Day	2 16% 8% 13% 5% 2 3 3 3 6% 39%	3146
February	1st to 10th	Day	3 16% 8% 11% 9% 4 4 4 4 5% 33%	1710
	11th to 20th	Day	4 18% 9% 10% 7% 3 4 4 5% 5% 32%	1698
	21st to end	Day	3 15% 9% 15% 8% 3 3 4 5% 6% 30%	1521
March	1st to 10th	Day	3 14% 6% 12% 8% 3 5% 4 6% 7% 33%	1954
	11th to 20th	Day	3 14% 5% 8% 6% 3 5% 6% 6% 8% 36%	1980
	21st to end	Day	4 21% 7% 10% 7% 3 5% 4 5% 6% 29%	2178
April	1st to 10th	Day	5% 15% 5% 8% 5% 4 5% 5% 5% 6% 37%	2022
	11th to 20th	Day	4 16% 7% 10% 6% 3 5% 5% 5% 6% 35%	2222
	21st to end	Day	7% 14% 5% 6% 4 2 4 4 4 6% 42%	2340
May	1st to 10th	Day	7% 11% 4 6% 7% 3 6% 5% 6% 7% 38%	2340
	11th to 20th	Day	6% 12% 3 6% 6% 3 5% 5% 6% 8% 41%	2301
	21st to end	Day	8% 11% 3 8% 6% 4 6% 6% 6% 7% 35%	2530
June	1st to 10th	Day	4 5% 2 4 5% 3 5% 5% 5% 8% 53%	2502
	11th to 20th	Day	5% 5% 2 4 4 3 4 3 5% 6% 59%	2520
	21st to end	Day	2 3 2 4 4 2 4 4 6% 6% 64%	2449
July	1st to 10th	Day	4 3 2 5% 5% 3 4 5% 6% 9% 53%	2340
	11th to 20th	Day	5% 5% 2 5% 5% 3 5% 5% 6% 8% 51%	2340
	21st to end	Day	5% 4 3 6% 6% 4 6% 6% 6% 8% 46%	2545
August	1st to 10th	Day	4 3 1 5% 7% 3 6% 6% 7% 6% 51%	2328
	11th to 20th	Day	4 4 2 5% 5% 2 4 5% 5% 7% 58%	2299
	21st to end	Day	4 5% 2 4 5% 3 5% 5% 5% 7% 55%	2525
September	1st to 10th	Day	5% 4 2 3 5% 3 3 4 5% 6% 61%	2075
	11th to 20th	Day	6% 4 1 4 4 3 5% 4 5% 5% 60%	1980
	21st to end	Day	6% 7% 1 2 3 2 3 4 4 4 64%	1980
October	1st to 10th	Day	8% 11% 3 5% 4 2 3 4 6% 4 50%	1868
	11th to 20th	Day	6% 8% 3 4 3 2 3 3 5% 5% 57%	1800
	21st to end	Day	3 10% 3 5% 4 3 3 4 4 5% 56%	1980
November	1st to 10th	Day	6% 10% 4 6% 5% 2 4 4 4 6% 49%	1710
	11th to 20th	Day	4 13% 4 6% 4 3 5% 4 5% 7% 47%	1706
	21st to end	Day	2 10% 6% 11% 5% 4 4 4 5% 6% 43%	1520
December	1st to 10th	Day	3 12% 5% 8% 7% 3 5% 5% 4 7% 41%	1520
	11th to 20th	Day	3 11% 7% 12% 8% 4 5% 5% 6% 6% 34%	1926
	21st to end	Day	2 11% 7% 11% 6% 3 5% 4 5% 7% 39%	2998
January	1st to 10th	Night	2 8% 6% 19% 9% 3 4 4 4 5% 34%	4097
	11th to 20th	Night	2 16% 8% 13% 10% 4 4 4 4 5% 29%	4110
	21st to end	Night	2 14% 9% 11% 6% 2 4 4 5% 7% 37%	4521
February	1st to 10th	Night	3 13% 6% 11% 8% 3 4 5% 6% 5% 37%	2470
	11th to 20th	Night	2 12% 6% 9% 7% 4 6% 5% 5% 5% 40%	2365
	21st to end	Night	2 11% 5% 12% 9% 4 5% 5% 6% 6% 36%	1829
March	1st to 10th	Night	2 13% 6% 11% 6% 3 5% 5% 5% 8% 36%	2005
	11th to 20th	Night	2 10% 5% 7% 5% 3 5% 5% 7% 8% 43%	1980
	21st to end	Night	4 14% 6% 7% 6% 3 4 5% 6% 7% 39%	2178
April	1st to 10th	Night	5% 14% 4 6% 4 2 5% 3 5% 6% 46%	1936
	11th to 20th	Night	4 9% 5% 6% 4 4 5% 6% 6% 7% 45%	1682
	21st to end	Night	6% 11% 3 5% 5% 3 4 5% 6% 7% 45%	1620
May	1st to 10th	Night	6% 9% 3 5% 6% 3 5% 6% 6% 7% 43%	1620
	11th to 20th	Night	4 7% 2 5% 4 3 5% 6% 6% 8% 51%	1594
	21st to end	Night	6% 7% 2 5% 6% 3 6% 5% 7% 9% 44%	1746
June	1st to 10th	Night	4 4 2 4 4 3 4 5% 6% 7% 56%	1454
	11th to 20th	Night	4 3 1 4 3 2 3 4 5% 6% 64%	1440
	21st to end	Night	2 2 2 2 3 3 4 4 5% 7% 66%	1503
July	1st to 10th	Night	3 3 2 5% 4 3 5% 6% 7% 7% 55%	1620
	11th to 20th	Night	3 4 2 5% 6% 4 6% 6% 6% 7% 51%	1620
	21st to end	Night	3 4 2 5% 6% 4 5% 7% 7% 8% 49%	1773
August	1st to 10th	Night	4 4 2 5% 5% 3 4 4 5% 9% 55%	1611
	11th to 20th	Night	3 3 2 3 5% 3 4 5% 6% 8% 57%	1602
	21st to end	Night	3 3 1 4 3 3 5% 5% 6% 8% 60%	1830
September	1st to 10th	Night	3 2 1 3 3 2 4 4 5% 6% 67%	1880
	11th to 20th	Night	5% 3 1 3 3 2 4 4 6% 6% 63%	1980
	21st to end	Night	6% 5% 1 3 2 2 2 3 4 5% 67%	1980
October	1st to 10th	Night	6% 6% 3 4 4 2 4 3 5% 5% 58%	2092
	11th to 20th	Night	4 6% 3 5% 3 3 3 5% 4 6% 59%	2160
	21st to end	Night	4 9% 3 5% 4 2 3 3 5% 6% 57%	2376
November	1st to 10th	Night	3 9% 4 5% 5% 3 4 4 6% 8% 50%	2364
	11th to 20th	Night	3 10% 3 7% 4 2 4 4 5% 8% 49%	2470
	21st to end	Night	2 9% 5% 9% 6% 3 4 4 5% 7% 45%	2641
December	1st to 10th	Night	3 11% 5% 8% 6% 4 5% 4 5% 7% 43%	2660
	11th to 20th	Night	4 11% 5% 10% 8% 3 5% 5% 7% 8% 35%	3271
	21st to end	Night	3 10% 6% 13% 10% 4 5% 4 5% 7% 34%	4681

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	47% 9% 14% 16% 11% 1	2859
	11th to 20th	Day	55% 7% 11% 16% 8% 2	2860
	21st to end	Day	44% 6% 19% 17% 11% 2	3146
February	1st to 10th	Day	53% 6% 12% 15% 10% 3	1710
	11th to 20th	Day	51% 5% 11% 19% 11% 2	1707
	21st to end	Day	54% 6% 12% 17% 10% 2	1521
March	1st to 10th	Day	48% 8% 11% 22% 9% 2	1954
	11th to 20th	Day	42% 7% 17% 20% 10% 3	1980
	21st to end	Day	55% 7% 13% 18% 6% 2	2178
April	1st to 10th	Day	44% 7% 14% 17% 14% 4	2022
	11th to 20th	Day	48% 7% 12% 20% 13% 1	2225
	21st to end	Day	41% 6% 11% 26% 14% 1	2340
May	1st to 10th	Day	41% 8% 11% 22% 17% 2	2340
	11th to 20th	Day	38% 7% 11% 27% 15% 2	2304
	21st to end	Day	44% 8% 12% 19% 15% 2	2530
June	1st to 10th	Day	26% 7% 11% 23% 27% 7%	2502
	11th to 20th	Day	24% 5% 9% 18% 28% 17%	2520
	21st to end	Day	20% 3 7% 13% 29% 29%	2449
July	1st to 10th	Day	25% 4 10% 15% 23% 23%	2276
	11th to 20th	Day	28% 6% 9% 15% 20% 22%	2271
	21st to end	Day	31% 8% 10% 13% 20% 18%	2404
August	1st to 10th	Day	28% 8% 12% 15% 19% 19%	2313
	11th to 20th	Day	24% 5% 9% 14% 27% 21%	2299
	21st to end	Day	26% 5% 8% 19% 27% 14%	2525
September	1st to 10th	Day	23% 5% 8% 14% 26% 24%	2075
	11th to 20th	Day	25% 6% 8% 18% 24% 19%	1980
	21st to end	Day	24% 4 7% 21% 34% 11%	1980
October	1st to 10th	Day	35% 6% 8% 21% 21% 8%	1868
	11th to 20th	Day	29% 3 9% 29% 23% 7%	1800
	21st to end	Day	29% 5% 15% 27% 21% 3	1980
November	1st to 10th	Day	35% 7% 12% 23% 20% 4	1710
	11th to 20th	Day	34% 6% 14% 25% 19% 2	1706
	21st to end	Day	39% 6% 12% 23% 14% 5%	1520
December	1st to 10th	Day	42% 8% 18% 18% 10% 5%	1520
	11th to 20th	Day	47% 7% 12% 21% 13% 1	1924
	21st to end	Day	43% 6% 12% 13% 18% 9%	2998
January	1st to 10th	Night	47% 9% 12% 16% 15% 2	4097
	11th to 20th	Night	55% 7% 11% 15% 8% 3	4110
	21st to end	Night	44% 7% 18% 19% 9% 3	4521
February	1st to 10th	Night	45% 8% 14% 19% 11% 2	2470
	11th to 20th	Night	43% 5% 13% 20% 17% 2	2366
	21st to end	Night	45% 6% 14% 19% 11% 5%	1829
March	1st to 10th	Night	44% 7% 15% 21% 13%	2005
	11th to 20th	Night	33% 8% 16% 27% 12% 4	1980
	21st to end	Night	42% 7% 16% 23% 9% 3	2178
April	1st to 10th	Night	38% 6% 15% 19% 17% 6%	1936
	11th to 20th	Night	34% 6% 16% 26% 16% 2	1682
	21st to end	Night	35% 5% 15% 26% 18% 1	1620
May	1st to 10th	Night	35% 7% 14% 24% 17% 2	1620
	11th to 20th	Night	27% 8% 15% 28% 19% 4	1595
	21st to end	Night	33% 7% 16% 26% 15% 3	1746
June	1st to 10th	Night	25% 6% 11% 25% 27% 7%	1454
	11th to 20th	Night	19% 5% 9% 18% 30% 18%	1440
	21st to end	Night	16% 3 6% 15% 27% 33%	1503
July	1st to 10th	Night	24% 5% 11% 16% 21% 23%	1575
	11th to 20th	Night	28% 6% 10% 15% 20% 21%	1566
	21st to end	Night	27% 8% 15% 15% 17% 18%	1674
August	1st to 10th	Night	26% 6% 13% 17% 19% 18%	1602
	11th to 20th	Night	23% 6% 9% 16% 26% 20%	1602
	21st to end	Night	20% 6% 11% 18% 27% 18%	1830
September	1st to 10th	Night	18% 5% 8% 18% 26% 26%	1880
	11th to 20th	Night	19% 5% 11% 20% 26% 19%	1980
	21st to end	Night	21% 4 5% 18% 38% 14%	1980
October	1st to 10th	Night	28% 5% 10% 25% 24% 9%	2092
	11th to 20th	Night	24% 5% 8% 29% 27% 7%	2160
	21st to end	Night	26% 5% 13% 28% 23% 5%	2376
November	1st to 10th	Night	30% 6% 14% 25% 21% 5%	2364
	11th to 20th	Night	31% 5% 15% 28% 19% 3	2470
	21st to end	Night	37% 5% 12% 21% 19% 7%	2641
December	1st to 10th	Night	39% 6% 17% 21% 12% 5%	2660
	11th to 20th	Night	44% 7% 15% 20% 13% 2	3272
	21st to end	Night	43% 7% 15% 16% 11% 8%	4681

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	17% 20% 29% 20% 12% 1	270
	11th to 20th	Day	14% 21% 35% 22% 7% 1	270
	21st to end	Day	7% 25% 37% 24% 6% 1	297
February	1st to 10th	Day	19% 29% 37% 11% 4	270
	11th to 20th	Day	16% 30% 34% 15% 5% 1	303
	21st to end	Day	15% 31% 37% 14% 2 1	363
March	1st to 10th	Day	15% 30% 35% 14% 6%	420
	11th to 20th	Day	13% 29% 32% 22% 4	420
	21st to end	Day	21% 30% 34% 13% 2	462
April	1st to 10th	Day	20% 26% 28% 18% 5% 2	420
	11th to 20th	Day	23% 29% 31% 13% 4 1	412
	21st to end	Day	23% 25% 25% 20% 6% 1	420
May	1st to 10th	Day	16% 24% 36% 15% 7% 1	423
	11th to 20th	Day	17% 20% 32% 20% 8% 2	448
	21st to end	Day	16% 21% 28% 23% 10% 2	485
June	1st to 10th	Day	7% 15% 34% 25% 16% 2	612
	11th to 20th	Day	9% 19% 34% 25% 13% 1	630
	21st to end	Day	5% 12% 40% 28% 13% 2	559
July	1st to 10th	Day	4 9% 37% 38% 11% 2	446
	11th to 20th	Day	6% 7% 46% 28% 10% 2	444
	21st to end	Day	5% 4 37% 36% 15% 4	487
August	1st to 10th	Day	6% 9% 42% 29% 11% 3	447
	11th to 20th	Day	3 11% 32% 35% 13% 5%	437
	21st to end	Day	4 10% 33% 34% 13% 5%	495
September	1st to 10th	Day	6% 13% 30% 29% 16% 6%	450
	11th to 20th	Day	8% 18% 32% 25% 13% 3	450
	21st to end	Day	11% 16% 25% 29% 15% 3	450
October	1st to 10th	Day	13% 17% 28% 22% 16% 4	338
	11th to 20th	Day	11% 19% 25% 24% 17% 3	270
	21st to end	Day	13% 21% 35% 22% 9%	297
November	1st to 10th	Day	20% 20% 26% 21% 13% 1	270
	11th to 20th	Day	10% 20% 36% 21% 10% 4	270
	21st to end	Day	12% 14% 31% 28% 13% 3	270
December	1st to 10th	Day	10% 19% 37% 23% 9% 3	270
	11th to 20th	Day	6% 24% 37% 27% 6% 1	270
	21st to end	Day	18% 24% 30% 22% 6% 1	297
January	1st to 10th	Night	9% 14% 32% 29% 14% 2	760
	11th to 20th	Night	9% 14% 34% 30% 11% 2	760
	21st to end	Night	7% 11% 37% 31% 11% 2	836
February	1st to 10th	Night	10% 15% 40% 25% 9% 1	760
	11th to 20th	Night	6% 15% 37% 30% 11% 1	744
	21st to end	Night	9% 14% 40% 28% 9% 1	610
March	1st to 10th	Night	8% 17% 32% 33% 8% 2	720
	11th to 20th	Night	6% 12% 30% 36% 15% 2	720
	21st to end	Night	10% 16% 34% 30% 9% 1	792
April	1st to 10th	Night	14% 16% 28% 30% 12% 1	676
	11th to 20th	Night	10% 15% 34% 31% 10%	533
	21st to end	Night	13% 13% 29% 29% 16% 1	540
May	1st to 10th	Night	10% 11% 34% 31% 14% 1	540
	11th to 20th	Night	8% 5% 26% 36% 22% 2	531
	21st to end	Night	9% 9% 26% 34% 19% 3	584
June	1st to 10th	Night	7% 8% 25% 37% 21% 2	540
	11th to 20th	Night	6% 10% 29% 38% 17% 1	540
	21st to end	Night	3 4 24% 41% 27% 2	540
July	1st to 10th	Night	4 2 17% 40% 34% 3	525
	11th to 20th	Night	4 2 17% 43% 30% 3	522
	21st to end	Night	3 1 9% 41% 43% 2	591
August	1st to 10th	Night	5% 2 16% 45% 30% 2	537
	11th to 20th	Night	5% 2 11% 44% 34% 3	534
	21st to end	Night	4 3 14% 44% 33% 2	594
September	1st to 10th	Night	5% 4 19% 38% 30% 5%	620
	11th to 20th	Night	6% 5% 16% 38% 30% 6%	720
	21st to end	Night	8% 7% 17% 32% 29% 7%	720
October	1st to 10th	Night	8% 10% 25% 32% 22% 3	720
	11th to 20th	Night	6% 9% 25% 36% 21% 4	720
	21st to end	Night	8% 12% 24% 35% 18% 3	792
November	1st to 10th	Night	9% 11% 27% 34% 17% 2	740
	11th to 20th	Night	9% 13% 29% 33% 13% 3	760
	21st to end	Night	9% 13% 28% 35% 12% 3	931
December	1st to 10th	Night	9% 12% 35% 32% 10% 1	950
	11th to 20th	Night	9% 14% 34% 33% 9% 1	950
	21st to end	Night	13% 14% 37% 27% 7% 1	931

Page generated at 2024-02-22 04:05:47. Version ac07

Copyright 2024 Attilla Danko