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 2024-10-24.

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% 5% 4 4 3 5% 6% 47%	100918
	Night	3 9% 4 9% 5% 4 4 3 5% 6% 48%	98078
Transparency	Day	35% 6% 11% 19% 18% 11%	100683
	Night	33% 6% 12% 21% 18% 10%	97902
Seeing	Day	12% 19% 34% 24% 10% 2	15113
	Night	8% 10% 28% 34% 18% 2	25398

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 11% 8% 18% 9% 5% 4 3 5% 5% 30%	2858
	11th to 20th	Day	2 16% 9% 16% 10% 4 2 2 4 4 29%	2860
	21st to end	Day	2 17% 8% 13% 4 3 2 2 4 6% 39%	3146
February	1st to 10th	Day	3 17% 7% 12% 8% 5% 3 4 4 5% 33%	1710
	11th to 20th	Day	3 20% 8% 11% 6% 4 4 3 5% 5% 32%	1698
	21st to end	Day	3 15% 7% 17% 6% 4 3 3 5% 5% 31%	1570
March	1st to 10th	Day	2 16% 6% 16% 6% 4 4 3 5% 6% 31%	3407
	11th to 20th	Day	2 12% 4 8% 5% 5% 5% 4 6% 7% 41%	3490
	21st to end	Day	3 26% 11% 11% 5% 4 4 4 5% 5% 20%	3825
April	1st to 10th	Day	4 16% 5% 9% 5% 5% 4 4 5% 6% 38%	2135
	11th to 20th	Day	4 17% 6% 10% 4 4 5% 4 5% 6% 35%	2348
	21st to end	Day	6% 15% 4 6% 4 4 4 3 5% 6% 42%	2470
May	1st to 10th	Day	6% 17% 7% 8% 5% 5% 5% 3 6% 6% 33%	4110
	11th to 20th	Day	5% 8% 2 5% 4 4 4 4 7% 8% 48%	4071
	21st to end	Day	6% 10% 3 7% 4 4 5% 4 6% 7% 43%	4477
June	1st to 10th	Day	4 5% 2 4 5% 5% 5% 4 6% 8% 53%	2641
	11th to 20th	Day	5% 5% 1 5% 3 4 3 2 5% 6% 59%	2660
	21st to end	Day	2 3 1 5% 3 3 3 3 6% 5% 65%	2584
July	1st to 10th	Day	2 2 1 3 2 3 2 3 4 5% 72%	4110
	11th to 20th	Day	4 5% 2 5% 5% 5% 6% 5% 7% 9% 48%	4110
	21st to end	Day	4 3 2 5% 4 4 4 4 5% 7% 58%	4454
August	1st to 10th	Day	4 4 1 6% 5% 4 5% 4 6% 6% 56%	4092
	11th to 20th	Day	3 3 2 5% 4 4 5% 3 5% 6% 60%	4028
	21st to end	Day	4 4 1 4 4 4 4 4 5% 5% 63%	4433
September	1st to 10th	Day	5% 4 2 4 4 3 4 3 5% 6% 61%	2190
	11th to 20th	Day	6% 5% 1 4 3 3 4 3 5% 5% 59%	2090
	21st to end	Day	5% 7% 1 3 2 2 3 3 4 4 65%	2090
October	1st to 10th	Day	7% 11% 2 5% 4 3 4 3 5% 4 52%	1971
	11th to 20th	Day	6% 10% 2 5% 3 3 3 3 4 5% 57%	1900
	21st to end	Day	3 10% 3 6% 3 4 3 3 4 5% 56%	2010
November	1st to 10th	Day	6% 10% 4 7% 4 3 4 3 5% 6% 48%	1710
	11th to 20th	Day	4 14% 3 6% 4 4 5% 3 5% 7% 47%	1706
	21st to end	Day	2 11% 6% 11% 5% 5% 3 3 5% 6% 43%	1520
December	1st to 10th	Day	3 13% 4 9% 6% 4 5% 4 5% 7% 40%	1520
	11th to 20th	Day	2 13% 6% 13% 6% 6% 5% 4 6% 5% 34%	1926
	21st to end	Day	2 12% 6% 12% 5% 4 5% 3 5% 7% 39%	2998
January	1st to 10th	Night	2 9% 6% 21% 7% 4 3 3 4 5% 33%	4097
	11th to 20th	Night	2 17% 7% 14% 9% 5% 4 3 4 5% 29%	4110
	21st to end	Night	2 15% 9% 12% 5% 3 4 3 5% 7% 36%	4521
February	1st to 10th	Night	2 13% 5% 12% 7% 5% 4 4 6% 5% 36%	2470
	11th to 20th	Night	2 13% 5% 10% 6% 5% 5% 3 5% 5% 40%	2365
	21st to end	Night	2 12% 5% 13% 7% 5% 4 4 6% 6% 37%	1884
March	1st to 10th	Night	1 11% 6% 15% 7% 5% 5% 4 5% 6% 35%	3466
	11th to 20th	Night	1 8% 4 7% 5% 4 4 5% 7% 7% 47%	3490
	21st to end	Night	2 17% 7% 13% 5% 4 4 4 5% 5% 34%	3828
April	1st to 10th	Night	5% 14% 4 7% 4 4 4 2 5% 6% 46%	2043
	11th to 20th	Night	4 10% 4 6% 5% 5% 5% 4 6% 7% 45%	1776
	21st to end	Night	6% 12% 3 6% 4 3 4 4 6% 7% 45%	1710
May	1st to 10th	Night	4 12% 5% 7% 6% 5% 5% 4 6% 7% 39%	2860
	11th to 20th	Night	3 5% 1 4 3 3 4 4 5% 7% 60%	2834
	21st to end	Night	4 7% 2 5% 4 4 5% 3 6% 8% 52%	3110
June	1st to 10th	Night	4 5% 2 5% 4 4 5% 4 6% 7% 55%	1534
	11th to 20th	Night	4 4 1 4 4 3 3 3 5% 6% 64%	1520
	21st to end	Night	2 2 2 3 2 3 4 3 5% 7% 66%	1587
July	1st to 10th	Night	4 3 1 3 3 2 3 3 4 4 70%	2860
	11th to 20th	Night	3 4 2 6% 5% 6% 6% 6% 7% 8% 49%	2860
	21st to end	Night	3 4 2 6% 5% 5% 5% 4 6% 5% 56%	3109
August	1st to 10th	Night	4 4 2 5% 4 4 4 3 5% 8% 57%	2847
	11th to 20th	Night	4 4 2 5% 4 4 4 4 5% 6% 57%	2811
	21st to end	Night	2 3 1 3 2 3 4 3 5% 6% 68%	3233
September	1st to 10th	Night	3 3 1 3 3 3 4 3 5% 6% 66%	1985
	11th to 20th	Night	4 3 1 3 3 3 3 3 6% 6% 63%	2090
	21st to end	Night	5% 5% 1 3 2 2 2 2 4 5% 68%	2090
October	1st to 10th	Night	6% 6% 2 4 3 3 3 3 5% 5% 59%	2209
	11th to 20th	Night	4 6% 2 6% 3 4 3 4 5% 6% 59%	2280
	21st to end	Night	4 9% 3 6% 3 2 3 2 5% 5% 57%	2412
November	1st to 10th	Night	3 10% 3 5% 4 3 4 4 7% 7% 50%	2364
	11th to 20th	Night	3 11% 3 7% 3 3 4 3 6% 8% 49%	2470
	21st to end	Night	2 11% 4 10% 5% 4 4 4 5% 7% 45%	2641
December	1st to 10th	Night	3 11% 5% 9% 5% 6% 4 4 5% 7% 43%	2660
	11th to 20th	Night	3 12% 5% 11% 6% 4 5% 4 7% 8% 35%	3271
	21st to end	Night	2 10% 5% 16% 7% 5% 4 4 6% 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	53% 6% 12% 17% 10% 1	1570
March	1st to 10th	Day	48% 8% 10% 21% 9% 4	3407
	11th to 20th	Day	36% 9% 19% 27% 8% 2	3490
	21st to end	Day	60% 7% 13% 14% 4 1	3825
April	1st to 10th	Day	43% 7% 14% 18% 14% 4	2135
	11th to 20th	Day	47% 7% 12% 21% 14% 1	2351
	21st to end	Day	41% 7% 11% 27% 14% 1	2470
May	1st to 10th	Day	42% 9% 12% 19% 14% 3	4110
	11th to 20th	Day	27% 7% 11% 34% 20% 2	4074
	21st to end	Day	33% 7% 11% 25% 21% 2	4477
June	1st to 10th	Day	25% 7% 11% 24% 26% 7%	2641
	11th to 20th	Day	24% 4 8% 19% 28% 17%	2660
	21st to end	Day	20% 3 7% 13% 29% 29%	2584
July	1st to 10th	Day	14% 3 6% 8% 16% 53%	4046
	11th to 20th	Day	29% 5% 5% 15% 25% 21%	4041
	21st to end	Day	23% 5% 7% 11% 25% 28%	4314
August	1st to 10th	Day	26% 5% 9% 23% 19% 17%	4078
	11th to 20th	Day	24% 4 7% 18% 27% 19%	4067
	21st to end	Day	22% 3 7% 15% 31% 21%	4432
September	1st to 10th	Day	23% 5% 8% 15% 26% 23%	2190
	11th to 20th	Day	25% 6% 7% 18% 25% 19%	2090
	21st to end	Day	23% 4 7% 20% 35% 12%	2090
October	1st to 10th	Day	33% 6% 8% 21% 23% 9%	1971
	11th to 20th	Day	30% 3 8% 30% 23% 6%	1900
	21st to end	Day	28% 4 15% 28% 21% 3	2010
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	44% 6% 14% 20% 12% 4	1884
March	1st to 10th	Night	40% 8% 15% 21% 13% 3	3466
	11th to 20th	Night	27% 10% 20% 30% 10% 2	3490
	21st to end	Night	45% 9% 13% 19% 12% 2	3828
April	1st to 10th	Night	37% 6% 15% 20% 17% 5%	2043
	11th to 20th	Night	34% 6% 16% 26% 17% 2	1776
	21st to end	Night	35% 6% 15% 26% 18% 1	1710
May	1st to 10th	Night	38% 7% 13% 20% 19% 2	2860
	11th to 20th	Night	20% 7% 11% 33% 24% 5%	2835
	21st to end	Night	25% 7% 13% 30% 23% 2	3110
June	1st to 10th	Night	24% 6% 11% 24% 27% 7%	1534
	11th to 20th	Night	21% 5% 8% 18% 31% 18%	1520
	21st to end	Night	16% 3 6% 15% 27% 33%	1587
July	1st to 10th	Night	17% 3 6% 9% 12% 53%	2815
	11th to 20th	Night	29% 5% 6% 13% 24% 23%	2806
	21st to end	Night	27% 5% 8% 15% 22% 23%	3011
August	1st to 10th	Night	25% 4 9% 22% 21% 19%	2838
	11th to 20th	Night	28% 4 7% 16% 25% 20%	2838
	21st to end	Night	17% 4 9% 15% 30% 25%	3233
September	1st to 10th	Night	18% 4 7% 18% 27% 25%	1985
	11th to 20th	Night	19% 5% 10% 20% 27% 18%	2090
	21st to end	Night	20% 4 5% 19% 37% 15%	2090
October	1st to 10th	Night	26% 5% 9% 25% 25% 10%	2209
	11th to 20th	Night	25% 5% 8% 29% 27% 7%	2280
	21st to end	Night	26% 5% 13% 29% 23% 5%	2412
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	16% 31% 37% 14% 2 1	382
March	1st to 10th	Day	17% 28% 34% 15% 6%	460
	11th to 20th	Day	13% 29% 33% 21% 4	460
	21st to end	Day	21% 30% 34% 12% 2	506
April	1st to 10th	Day	20% 26% 29% 18% 5% 2	460
	11th to 20th	Day	22% 28% 32% 13% 4 1	452
	21st to end	Day	22% 25% 27% 21% 5% 1	460
May	1st to 10th	Day	18% 25% 35% 14% 6% 1	463
	11th to 20th	Day	16% 21% 31% 21% 9% 2	488
	21st to end	Day	16% 21% 29% 22% 10% 2	529
June	1st to 10th	Day	6% 15% 35% 26% 16% 2	661
	11th to 20th	Day	9% 19% 34% 24% 12% 1	680
	21st to end	Day	6% 13% 41% 27% 12% 1	604
July	1st to 10th	Day	4 11% 37% 35% 11% 1	486
	11th to 20th	Day	6% 7% 44% 29% 11% 2	484
	21st to end	Day	4 4 38% 36% 14% 4	531
August	1st to 10th	Day	7% 9% 40% 30% 11% 3	487
	11th to 20th	Day	4 12% 34% 34% 12% 4	477
	21st to end	Day	5% 12% 34% 32% 12% 4	539
September	1st to 10th	Day	6% 13% 29% 30% 16% 6%	490
	11th to 20th	Day	10% 19% 32% 24% 12% 3	490
	21st to end	Day	11% 16% 25% 30% 15% 3	490
October	1st to 10th	Day	12% 16% 27% 23% 15% 5%	371
	11th to 20th	Day	13% 18% 26% 25% 16% 3	300
	21st to end	Day	13% 21% 36% 21% 9%	306
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	10% 14% 41% 27% 8% 1	628
March	1st to 10th	Night	8% 17% 33% 33% 8% 2	760
	11th to 20th	Night	6% 13% 31% 35% 14% 2	760
	21st to end	Night	10% 16% 35% 29% 8% 1	836
April	1st to 10th	Night	13% 16% 29% 30% 11% 1	713
	11th to 20th	Night	10% 16% 34% 32% 9%	563
	21st to end	Night	12% 13% 29% 29% 15% 1	570
May	1st to 10th	Night	10% 12% 34% 30% 13% 1	570
	11th to 20th	Night	8% 5% 28% 37% 21% 2	561
	21st to end	Night	9% 9% 27% 34% 18% 2	617
June	1st to 10th	Night	6% 8% 25% 38% 20% 2	570
	11th to 20th	Night	6% 10% 29% 38% 16% 1	570
	21st to end	Night	3 4 25% 41% 26% 2	570
July	1st to 10th	Night	4 3 18% 40% 33% 3	555
	11th to 20th	Night	5% 2 17% 42% 31% 3	552
	21st to end	Night	3 2 10% 41% 42% 2	624
August	1st to 10th	Night	5% 2 17% 45% 30% 2	567
	11th to 20th	Night	6% 3 13% 42% 33% 3	564
	21st to end	Night	5% 3 15% 43% 32% 2	627
September	1st to 10th	Night	4 4 20% 37% 31% 4	655
	11th to 20th	Night	6% 6% 17% 37% 29% 6%	760
	21st to end	Night	8% 7% 18% 33% 28% 6%	760
October	1st to 10th	Night	8% 9% 24% 33% 22% 3	760
	11th to 20th	Night	6% 9% 25% 37% 19% 4	760
	21st to end	Night	8% 12% 24% 36% 18% 3	804
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

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