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 2026-07-31.

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% 4 4 4 3 5% 6% 49%	146750
	Night	3 9% 4 8% 5% 4 4 3 5% 6% 50%	143827
Transparency	Day	35% 5% 9% 20% 21% 10%	141510
	Night	33% 5% 10% 21% 21% 10%	140074
Seeing	Day	13% 19% 33% 23% 9% 2	17488
	Night	9% 11% 28% 34% 17% 2	27783

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	3 13% 9% 19% 7% 4 3 3 4 4 30%	5318
	11th to 20th	Day	1 9% 5% 12% 10% 4 2 2 3 3 49%	5340
	21st to end	Day	1 10% 6% 12% 4 3 3 2 3 5% 50%	5844
February	1st to 10th	Day	3 16% 7% 11% 8% 5% 4 4 4 5% 34%	1890
	11th to 20th	Day	3 20% 8% 12% 6% 4 4 3 5% 5% 30%	1882
	21st to end	Day	2 15% 7% 16% 6% 4 3 3 6% 6% 33%	1730
March	1st to 10th	Day	2 16% 8% 15% 5% 4 3 3 4 5% 36%	5013
	11th to 20th	Day	1 11% 4 16% 5% 4 5% 4 5% 6% 38%	5110
	21st to end	Day	3 24% 10% 11% 5% 4 4 3 4 5% 27%	5607
April	1st to 10th	Day	4 15% 5% 9% 4 4 4 4 5% 6% 39%	2360
	11th to 20th	Day	3 16% 6% 10% 5% 4 5% 4 5% 6% 36%	2598
	21st to end	Day	6% 16% 4 7% 4 4 4 3 5% 6% 41%	2730
May	1st to 10th	Day	5% 13% 5% 6% 5% 5% 5% 4 6% 6% 41%	7626
	11th to 20th	Day	4 14% 4 7% 4 4 4 3 5% 6% 45%	7596
	21st to end	Day	5% 9% 2 7% 4 4 5% 4 5% 7% 47%	8370
June	1st to 10th	Day	4 5% 2 4 4 5% 5% 4 6% 8% 54%	2919
	11th to 20th	Day	4 5% 1 4 3 4 3 3 5% 6% 62%	2940
	21st to end	Day	2 3 1 4 3 3 3 3 6% 5% 65%	2856
July	1st to 10th	Day	3 3 1 4 3 3 3 3 4 5% 68%	6009
	11th to 20th	Day	3 4 2 5% 4 5% 5% 4 7% 8% 53%	6010
	21st to end	Day	3 3 1 4 3 4 4 4 5% 7% 62%	6532
August	1st to 10th	Day	3 3 1 4 4 4 4 4 6% 6% 62%	5779
	11th to 20th	Day	2 3 1 4 3 4 4 3 4 6% 64%	5798
	21st to end	Day	7% 6% 2 6% 5% 4 5% 4 5% 5% 52%	6341
September	1st to 10th	Day	5% 4 2 4 4 3 4 3 5% 6% 60%	2305
	11th to 20th	Day	6% 5% 1 5% 4 3 5% 4 5% 5% 58%	2200
	21st to end	Day	5% 7% 2 3 2 3 3 3 4 4 64%	2200
October	1st to 10th	Day	5% 7% 1 4 3 2 3 2 4 3 64%	3383
	11th to 20th	Day	8% 10% 2 5% 3 3 3 3 4 5% 52%	3250
	21st to end	Day	3 10% 3 7% 3 3 3 3 4 5% 57%	3548
November	1st to 10th	Day	5% 10% 4 7% 4 3 4 4 4 7% 49%	1894
	11th to 20th	Day	3 14% 4 6% 4 4 4 3 5% 7% 46%	1885
	21st to end	Day	2 10% 6% 11% 4 5% 4 3 6% 6% 44%	1680
December	1st to 10th	Day	2 8% 3 7% 5% 3 3 3 4 7% 55%	2700
	11th to 20th	Day	3 10% 7% 13% 6% 5% 5% 4 6% 6% 35%	3106
	21st to end	Day	3 16% 7% 13% 5% 5% 4 3 4 6% 34%	4401
January	1st to 10th	Night	2 14% 7% 20% 7% 4 4 3 4 5% 30%	7605
	11th to 20th	Night	1 10% 4 10% 8% 4 3 2 3 4 50%	7650
	21st to end	Night	1 8% 6% 11% 4 3 3 3 5% 6% 49%	8370
February	1st to 10th	Night	2 12% 5% 12% 6% 5% 4 4 6% 5% 38%	2730
	11th to 20th	Night	2 13% 6% 11% 6% 5% 5% 3 5% 5% 38%	2621
	21st to end	Night	2 12% 4 12% 7% 5% 4 4 5% 6% 39%	2076
March	1st to 10th	Night	1 14% 7% 13% 6% 4 4 3 4 5% 38%	5100
	11th to 20th	Night	1 11% 5% 11% 5% 4 5% 5% 7% 7% 39%	5110
	21st to end	Night	2 16% 6% 10% 5% 4 4 4 5% 5% 40%	5610
April	1st to 10th	Night	4 14% 4 7% 4 3 4 2 5% 6% 47%	2258
	11th to 20th	Night	3 10% 4 6% 5% 5% 5% 4 6% 7% 46%	1965
	21st to end	Night	6% 12% 3 7% 5% 4 4 4 6% 6% 44%	1890
May	1st to 10th	Night	4 9% 3 6% 4 4 4 4 6% 7% 49%	5321
	11th to 20th	Night	4 8% 2 5% 3 3 4 4 5% 6% 57%	5296
	21st to end	Night	4 6% 2 5% 4 4 5% 3 6% 7% 55%	5837
June	1st to 10th	Night	3 5% 2 5% 3 3 5% 4 6% 7% 57%	1696
	11th to 20th	Night	4 4 1 4 3 3 3 3 5% 6% 65%	1680
	21st to end	Night	2 3 1 3 2 3 4 3 5% 7% 66%	1755
July	1st to 10th	Night	3 3 1 4 3 3 4 3 4 4 68%	4190
	11th to 20th	Night	3 4 2 5% 4 5% 5% 5% 6% 7% 53%	4190
	21st to end	Night	2 3 2 5% 4 4 4 4 5% 5% 62%	4562
August	1st to 10th	Night	3 3 1 4 4 3 4 3 5% 7% 63%	4033
	11th to 20th	Night	3 4 2 5% 4 4 4 3 4 6% 60%	4051
	21st to end	Night	4 5% 2 6% 4 4 5% 3 5% 6% 56%	4635
September	1st to 10th	Night	3 3 1 4 3 3 4 3 5% 6% 65%	2090
	11th to 20th	Night	5% 3 1 4 3 4 3 3 6% 6% 63%	2200
	21st to end	Night	5% 5% 1 3 2 2 2 2 4 5% 67%	2200
October	1st to 10th	Night	4 4 2 3 2 2 2 2 4 4 71%	3809
	11th to 20th	Night	7% 7% 2 5% 3 3 3 3 4 6% 56%	3898
	21st to end	Night	4 9% 3 6% 3 3 3 3 5% 6% 55%	4252
November	1st to 10th	Night	2 10% 3 6% 4 3 3 4 6% 7% 50%	2620
	11th to 20th	Night	3 11% 3 8% 3 4 4 3 6% 8% 48%	2730
	21st to end	Night	2 10% 4 10% 5% 4 4 3 5% 7% 46%	2920
December	1st to 10th	Night	2 7% 3 7% 6% 5% 3 3 4 6% 55%	4710
	11th to 20th	Night	2 11% 5% 10% 5% 4 4 4 6% 7% 42%	5321
	21st to end	Night	2 14% 6% 14% 6% 5% 4 4 5% 7% 33%	6846

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	53% 6% 12% 16% 10% 2	5321
	11th to 20th	Day	40% 4 8% 21% 18% 8%	5340
	21st to end	Day	36% 4 14% 17% 19% 9%	5844
February	1st to 10th	Day	52% 6% 11% 16% 11% 4	1890
	11th to 20th	Day	54% 5% 10% 18% 11% 2	1891
	21st to end	Day	50% 6% 12% 19% 11% 3	1730
March	1st to 10th	Day	48% 6% 7% 18% 14% 7%	5013
	11th to 20th	Day	43% 7% 15% 23% 11% 1	5110
	21st to end	Day	57% 6% 15% 16% 6% 1	5607
April	1st to 10th	Day	43% 6% 14% 19% 15% 3	2360
	11th to 20th	Day	46% 6% 11% 21% 15% 1	2601
	21st to end	Day	42% 6% 10% 25% 16% 1	2730
May	1st to 10th	Day	38% 6% 11% 22% 20% 3	7626
	11th to 20th	Day	37% 5% 6% 24% 25% 3	7599
	21st to end	Day	34% 5% 8% 28% 24% 2	8371
June	1st to 10th	Day	25% 7% 10% 24% 29% 6%	2919
	11th to 20th	Day	22% 4 7% 17% 30% 19%	2940
	21st to end	Day	20% 3 6% 13% 31% 28%	2856
July	1st to 10th	Day	18% 3 4 7% 20% 48%	5946
	11th to 20th	Day	27% 4 4 14% 29% 21%	5941
	21st to end	Day	21% 5% 5% 12% 30% 27%	6348
August	1st to 10th	Day	26% 5% 9% 23% 19% 18%	4208
	11th to 20th	Day	24% 4 7% 19% 27% 19%	4197
	21st to end	Day	24% 3 8% 15% 30% 20%	4572
September	1st to 10th	Day	24% 5% 8% 16% 26% 22%	2305
	11th to 20th	Day	26% 6% 7% 18% 25% 18%	2200
	21st to end	Day	24% 4 7% 20% 34% 12%	2200
October	1st to 10th	Day	24% 4 5% 21% 36% 11%	3383
	11th to 20th	Day	35% 3 5% 31% 23% 4	3250
	21st to end	Day	31% 3 10% 27% 27% 3	3548
November	1st to 10th	Day	34% 7% 11% 24% 20% 4	1894
	11th to 20th	Day	36% 5% 14% 24% 19% 2	1885
	21st to end	Day	38% 6% 12% 25% 14% 5%	1680
December	1st to 10th	Day	30% 5% 11% 32% 19% 4	2700
	11th to 20th	Day	47% 5% 13% 19% 15% 2	3104
	21st to end	Day	50% 4 9% 14% 16% 6%	4401
January	1st to 10th	Night	54% 6% 11% 13% 12% 4	7605
	11th to 20th	Night	39% 4 8% 22% 19% 7%	7650
	21st to end	Night	35% 5% 12% 16% 21% 10%	8370
February	1st to 10th	Night	44% 8% 13% 20% 12% 3	2730
	11th to 20th	Night	45% 5% 12% 20% 16% 2	2622
	21st to end	Night	42% 6% 13% 22% 12% 6%	2076
March	1st to 10th	Night	42% 6% 10% 19% 16% 6%	5100
	11th to 20th	Night	37% 8% 16% 26% 11% 2	5110
	21st to end	Night	42% 7% 17% 22% 11% 1	5610
April	1st to 10th	Night	37% 5% 14% 21% 19% 5%	2258
	11th to 20th	Night	34% 6% 14% 25% 18% 3	1965
	21st to end	Night	36% 5% 14% 26% 18% 1	1890
May	1st to 10th	Night	32% 5% 10% 27% 24% 2	5319
	11th to 20th	Night	27% 5% 7% 26% 30% 6%	5297
	21st to end	Night	26% 4 9% 34% 25% 1	5838
June	1st to 10th	Night	23% 6% 11% 23% 30% 7%	1696
	11th to 20th	Night	19% 5% 8% 17% 31% 20%	1680
	21st to end	Night	17% 3 5% 15% 29% 31%	1755
July	1st to 10th	Night	20% 3 4 7% 16% 50%	4145
	11th to 20th	Night	27% 4 5% 12% 26% 27%	4136
	21st to end	Night	22% 4 6% 13% 28% 26%	4434
August	1st to 10th	Night	25% 4 8% 22% 21% 20%	2928
	11th to 20th	Night	28% 4 7% 16% 26% 19%	2928
	21st to end	Night	19% 4 9% 15% 30% 24%	3335
September	1st to 10th	Night	19% 4 8% 19% 27% 24%	2090
	11th to 20th	Night	20% 5% 10% 20% 28% 17%	2200
	21st to end	Night	21% 4 6% 19% 37% 15%	2200
October	1st to 10th	Night	19% 3 6% 24% 36% 13%	3809
	11th to 20th	Night	30% 3 5% 31% 25% 6%	3898
	21st to end	Night	29% 4 8% 30% 26% 4	4252
November	1st to 10th	Night	30% 5% 14% 24% 21% 5%	2620
	11th to 20th	Night	32% 5% 14% 29% 18% 2	2730
	21st to end	Night	36% 5% 11% 23% 19% 6%	2920
December	1st to 10th	Night	30% 4 11% 30% 18% 7%	4710
	11th to 20th	Night	40% 5% 16% 25% 13% 1	5322
	21st to end	Night	47% 5% 13% 17% 12% 5%	6846

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	20% 22% 28% 18% 10% 1	330
	11th to 20th	Day	16% 20% 34% 21% 8% 1	330
	21st to end	Day	10% 24% 38% 22% 5% 1	363
February	1st to 10th	Day	23% 25% 35% 12% 4 1	330
	11th to 20th	Day	19% 28% 34% 14% 4 1	367
	21st to end	Day	18% 29% 36% 14% 3	446
March	1st to 10th	Day	17% 29% 33% 16% 5%	540
	11th to 20th	Day	17% 29% 31% 19% 4	540
	21st to end	Day	22% 29% 35% 12% 2	594
April	1st to 10th	Day	20% 25% 29% 18% 6% 2	540
	11th to 20th	Day	22% 28% 32% 14% 4 1	532
	21st to end	Day	23% 25% 27% 19% 5% 1	540
May	1st to 10th	Day	18% 24% 34% 17% 7% 1	543
	11th to 20th	Day	18% 21% 31% 20% 8% 2	568
	21st to end	Day	17% 20% 29% 22% 9% 2	617
June	1st to 10th	Day	6% 16% 35% 26% 15% 2	759
	11th to 20th	Day	9% 20% 36% 24% 11% 1	780
	21st to end	Day	8% 14% 40% 26% 11% 1	696
July	1st to 10th	Day	5% 12% 37% 34% 11% 1	566
	11th to 20th	Day	5% 7% 43% 30% 12% 2	564
	21st to end	Day	4 6% 38% 35% 13% 3	616
August	1st to 10th	Day	6% 12% 41% 28% 10% 3	527
	11th to 20th	Day	4 11% 35% 33% 12% 4	517
	21st to end	Day	6% 12% 34% 32% 12% 4	583
September	1st to 10th	Day	6% 13% 30% 29% 15% 6%	530
	11th to 20th	Day	10% 19% 32% 24% 12% 3	530
	21st to end	Day	11% 16% 26% 30% 16% 3	530
October	1st to 10th	Day	13% 17% 28% 23% 14% 5%	404
	11th to 20th	Day	16% 18% 26% 23% 15% 3	330
	21st to end	Day	15% 21% 33% 23% 9%	363
November	1st to 10th	Day	20% 19% 27% 20% 12% 2	330
	11th to 20th	Day	13% 21% 36% 19% 8% 3	330
	21st to end	Day	12% 17% 32% 25% 11% 3	330
December	1st to 10th	Day	10% 21% 36% 22% 9% 2	330
	11th to 20th	Day	10% 22% 37% 25% 6% 1	330
	21st to end	Day	23% 24% 27% 20% 6% 1	363
January	1st to 10th	Night	10% 15% 32% 27% 13% 2	840
	11th to 20th	Night	9% 14% 33% 30% 11% 2	840
	21st to end	Night	7% 12% 38% 31% 10% 2	924
February	1st to 10th	Night	12% 15% 39% 25% 9% 1	840
	11th to 20th	Night	8% 17% 36% 28% 10% 1	824
	21st to end	Night	10% 14% 41% 27% 8% 1	692
March	1st to 10th	Night	9% 18% 32% 32% 8% 2	840
	11th to 20th	Night	9% 13% 31% 33% 13% 1	840
	21st to end	Night	10% 16% 35% 29% 8% 1	924
April	1st to 10th	Night	13% 16% 28% 31% 12% 1	788
	11th to 20th	Night	11% 16% 35% 30% 8%	623
	21st to end	Night	13% 13% 29% 30% 15% 1	630
May	1st to 10th	Night	9% 12% 34% 31% 13% 1	630
	11th to 20th	Night	9% 6% 28% 36% 19% 2	621
	21st to end	Night	9% 10% 25% 35% 19% 2	683
June	1st to 10th	Night	6% 8% 25% 39% 20% 2	630
	11th to 20th	Night	7% 9% 30% 38% 16% 1	630
	21st to end	Night	4 5% 24% 40% 24% 2	630
July	1st to 10th	Night	4 3 19% 42% 31% 2	615
	11th to 20th	Night	5% 2 17% 42% 31% 4	612
	21st to end	Night	3 1 11% 42% 41% 2	687
August	1st to 10th	Night	5% 2 18% 45% 29% 2	597
	11th to 20th	Night	6% 3 13% 42% 33% 3	594
	21st to end	Night	5% 3 15% 43% 32% 2	660
September	1st to 10th	Night	4 3 20% 38% 30% 4	690
	11th to 20th	Night	6% 6% 18% 38% 28% 6%	800
	21st to end	Night	8% 7% 18% 34% 27% 6%	800
October	1st to 10th	Night	9% 10% 25% 32% 21% 3	800
	11th to 20th	Night	9% 9% 25% 36% 19% 4	800
	21st to end	Night	8% 12% 24% 35% 17% 3	880
November	1st to 10th	Night	9% 11% 28% 34% 16% 2	820
	11th to 20th	Night	10% 14% 30% 32% 12% 3	840
	21st to end	Night	9% 14% 29% 34% 12% 2	1030
December	1st to 10th	Night	10% 13% 34% 32% 11% 1	1050
	11th to 20th	Night	10% 13% 35% 32% 9% 1	1050
	21st to end	Night	15% 15% 35% 26% 7% 1	1029

Page generated at 2026-07-28 01:25:24. Version ac07

Copyright © 2026 Attilla Danko.