Wolf Point
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wolf Point clear sky chart from 2005-11-06 to 2024-12-24.

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	8% 7% 3 6% 5% 4 5% 4 6% 8% 45%	106234
	Night	7% 7% 3 7% 5% 4 5% 4 6% 8% 45%	102575
Transparency	Day	35% 8% 15% 26% 13% 3	105979
	Night	35% 7% 16% 26% 13% 2	102420
Seeing	Day	10% 8% 29% 31% 17% 4	16260
	Night	10% 7% 30% 39% 13% 1	25964

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 10% 3 8% 7% 7% 7% 6% 8% 9% 31%	2538
	11th to 20th	Day	3 7% 3 12% 10% 6% 7% 6% 8% 9% 29%	2540
	21st to end	Day	5% 9% 3 6% 6% 5% 6% 4 7% 8% 40%	2794
February	1st to 10th	Day	7% 12% 3 12% 7% 6% 6% 5% 6% 8% 28%	1681
	11th to 20th	Day	7% 12% 4 11% 7% 6% 5% 5% 7% 7% 29%	1665
	21st to end	Day	5% 11% 3 10% 7% 6% 5% 5% 7% 9% 32%	1536
March	1st to 10th	Day	5% 12% 5% 13% 7% 5% 4 3 6% 7% 34%	3130
	11th to 20th	Day	7% 8% 3 7% 4 4 4 4 6% 9% 43%	3417
	21st to end	Day	13% 16% 6% 9% 6% 5% 4 4 5% 7% 25%	4058
April	1st to 10th	Day	8% 8% 3 8% 6% 5% 6% 5% 6% 7% 38%	2280
	11th to 20th	Day	13% 11% 4 8% 5% 5% 5% 3 6% 7% 33%	2251
	21st to end	Day	13% 10% 3 8% 5% 4 4 5% 6% 6% 37%	2543
May	1st to 10th	Day	16% 8% 3 6% 5% 4 4 3 6% 7% 38%	4430
	11th to 20th	Day	11% 6% 2 6% 4 5% 5% 4 7% 9% 41%	4388
	21st to end	Day	13% 6% 3 6% 5% 5% 5% 5% 8% 9% 37%	4825
June	1st to 10th	Day	11% 5% 2 5% 5% 5% 5% 4 6% 8% 44%	2660
	11th to 20th	Day	11% 5% 2 5% 4 5% 5% 4 6% 8% 45%	2739
	21st to end	Day	6% 4 2 4 4 4 4 5% 7% 8% 52%	2850
July	1st to 10th	Day	3 3 1 5% 6% 5% 6% 5% 9% 9% 47%	4597
	11th to 20th	Day	3 2 1 3 3 3 4 4 6% 9% 63%	4430
	21st to end	Day	3 2 1 3 3 3 4 3 5% 8% 64%	4802
August	1st to 10th	Day	8% 4 1 5% 3 3 3 3 4 8% 58%	4411
	11th to 20th	Day	5% 4 2 5% 4 4 4 4 6% 9% 54%	4132
	21st to end	Day	8% 3 1 4 3 3 4 3 5% 6% 60%	4242
September	1st to 10th	Day	10% 4 2 4 3 3 4 2 4 7% 56%	2280
	11th to 20th	Day	10% 5% 2 4 3 4 3 4 5% 8% 52%	2280
	21st to end	Day	11% 5% 1 5% 3 3 4 3 5% 7% 53%	2039
October	1st to 10th	Day	8% 5% 2 5% 3 3 3 2 5% 6% 59%	3170
	11th to 20th	Day	6% 5% 2 5% 3 4 4 3 4 8% 55%	3133
	21st to end	Day	6% 5% 2 5% 3 3 4 4 6% 9% 53%	3091
November	1st to 10th	Day	11% 8% 3 7% 5% 3 4 4 6% 6% 43%	1678
	11th to 20th	Day	6% 7% 3 8% 5% 4 4 4 6% 8% 45%	1600
	21st to end	Day	6% 9% 4 11% 5% 5% 6% 4 7% 8% 35%	1600
December	1st to 10th	Day	7% 11% 5% 11% 7% 5% 4 4 6% 7% 33%	1600
	11th to 20th	Day	4 11% 4 9% 5% 6% 6% 5% 6% 7% 38%	2006
	21st to end	Day	5% 7% 2 7% 5% 6% 5% 4 6% 9% 43%	2818
January	1st to 10th	Night	3 7% 3 9% 6% 6% 7% 6% 7% 9% 37%	4417
	11th to 20th	Night	3 8% 4 12% 8% 7% 8% 4 6% 8% 33%	4430
	21st to end	Night	4 11% 4 8% 5% 5% 6% 5% 8% 8% 36%	4873
February	1st to 10th	Night	8% 10% 4 10% 7% 6% 5% 4 6% 6% 33%	2517
	11th to 20th	Night	6% 10% 4 9% 5% 6% 6% 5% 7% 7% 34%	2402
	21st to end	Night	5% 9% 4 9% 7% 4 5% 4 5% 7% 41%	1918
March	1st to 10th	Night	6% 10% 3 10% 5% 4 5% 3 7% 9% 39%	3734
	11th to 20th	Night	4 6% 3 7% 4 4 4 4 7% 10% 46%	3557
	21st to end	Night	11% 16% 6% 10% 6% 5% 5% 4 6% 6% 24%	3586
April	1st to 10th	Night	7% 8% 4 8% 6% 4 4 4 6% 7% 42%	1900
	11th to 20th	Night	11% 8% 4 8% 5% 5% 4 5% 5% 6% 38%	1877
	21st to end	Night	11% 8% 3 7% 4 4 4 5% 6% 8% 41%	1634
May	1st to 10th	Night	13% 7% 2 7% 4 4 5% 3 5% 7% 42%	2540
	11th to 20th	Night	10% 6% 2 5% 5% 4 6% 4 7% 8% 41%	2517
	21st to end	Night	12% 5% 2 5% 5% 4 5% 4 7% 9% 41%	2762
June	1st to 10th	Night	9% 6% 2 6% 4 4 4 5% 5% 10% 45%	1520
	11th to 20th	Night	9% 4 2 5% 4 5% 5% 4 6% 9% 47%	1435
	21st to end	Night	5% 4 2 4 4 5% 4 3 7% 9% 54%	1330
July	1st to 10th	Night	5% 3 1 4 3 3 4 3 5% 9% 57%	2348
	11th to 20th	Night	4 2 1 4 3 4 4 3 5% 7% 63%	2540
	21st to end	Night	3 2 1 3 3 4 5% 5% 6% 8% 62%	2761
August	1st to 10th	Night	7% 4 2 4 4 4 4 3 4 5% 58%	2528
	11th to 20th	Night	4 3 1 4 3 4 4 3 7% 11% 55%	2706
	21st to end	Night	6% 4 2 4 3 3 3 4 5% 7% 59%	3425
September	1st to 10th	Night	7% 3 1 4 3 2 3 4 4 8% 60%	1900
	11th to 20th	Night	9% 4 1 4 3 3 4 3 6% 7% 57%	1900
	21st to end	Night	11% 4 2 4 3 3 3 3 5% 7% 54%	2137
October	1st to 10th	Night	7% 3 2 4 3 3 3 3 5% 7% 59%	3800
	11th to 20th	Night	6% 5% 2 4 4 4 4 3 6% 8% 54%	3778
	21st to end	Night	7% 6% 2 5% 4 4 5% 4 6% 8% 50%	4453
November	1st to 10th	Night	11% 9% 3 6% 4 3 5% 4 5% 7% 44%	2617
	11th to 20th	Night	6% 8% 3 9% 5% 5% 4 4 6% 8% 42%	2800
	21st to end	Night	5% 10% 4 8% 5% 4 5% 4 6% 8% 41%	2800
December	1st to 10th	Night	6% 10% 4 10% 7% 5% 5% 4 6% 8% 35%	2800
	11th to 20th	Night	4 10% 4 9% 6% 5% 4 4 7% 8% 38%	3411
	21st to end	Night	5% 8% 3 6% 4 4 4 4 6% 8% 49%	4922

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	42% 12% 20% 21% 5%	2539
	11th to 20th	Day	45% 11% 17% 17% 9% 1	2540
	21st to end	Day	38% 9% 21% 27% 5%	2794
February	1st to 10th	Day	52% 7% 15% 17% 9%	1681
	11th to 20th	Day	52% 8% 15% 16% 8%	1674
	21st to end	Day	46% 9% 17% 18% 8% 2	1536
March	1st to 10th	Day	47% 7% 13% 28% 4	3130
	11th to 20th	Day	36% 9% 25% 23% 7%	3417
	21st to end	Day	56% 9% 16% 14% 4	4058
April	1st to 10th	Day	41% 9% 17% 22% 10% 1	2280
	11th to 20th	Day	48% 8% 14% 21% 8%	2254
	21st to end	Day	44% 8% 13% 23% 11%	2543
May	1st to 10th	Day	42% 9% 15% 21% 10% 2	4430
	11th to 20th	Day	33% 11% 16% 28% 11% 1	4392
	21st to end	Day	37% 12% 19% 24% 9% 1	4825
June	1st to 10th	Day	35% 8% 18% 26% 11% 2	2660
	11th to 20th	Day	35% 8% 18% 25% 12% 3	2739
	21st to end	Day	26% 9% 18% 32% 14% 2	2850
July	1st to 10th	Day	27% 9% 18% 24% 17% 5%	4527
	11th to 20th	Day	16% 5% 12% 34% 23% 9%	4355
	21st to end	Day	17% 4 8% 31% 27% 13%	4651
August	1st to 10th	Day	26% 5% 9% 29% 22% 9%	4396
	11th to 20th	Day	26% 5% 14% 33% 19% 3	4174
	21st to end	Day	24% 5% 12% 35% 21% 3	4241
September	1st to 10th	Day	29% 5% 10% 30% 21% 6%	2280
	11th to 20th	Day	30% 6% 16% 27% 16% 4	2280
	21st to end	Day	31% 6% 9% 30% 21% 3	2039
October	1st to 10th	Day	28% 4 10% 29% 25% 5%	3170
	11th to 20th	Day	29% 5% 11% 37% 17% 1	3133
	21st to end	Day	26% 7% 16% 35% 16% 1	3091
November	1st to 10th	Day	41% 7% 13% 27% 11% 2	1678
	11th to 20th	Day	36% 7% 23% 24% 9% 1	1600
	21st to end	Day	44% 8% 23% 18% 6% 1	1600
December	1st to 10th	Day	49% 9% 15% 22% 6%	1600
	11th to 20th	Day	42% 9% 25% 20% 4	2004
	21st to end	Day	36% 7% 11% 30% 13% 3	2818
January	1st to 10th	Night	37% 11% 24% 20% 7% 1	4417
	11th to 20th	Night	47% 7% 17% 18% 10%	4430
	21st to end	Night	39% 11% 23% 22% 5%	4873
February	1st to 10th	Night	49% 6% 18% 19% 8%	2517
	11th to 20th	Night	45% 9% 18% 19% 8% 1	2403
	21st to end	Night	42% 7% 16% 24% 12%	1918
March	1st to 10th	Night	38% 8% 16% 30% 7%	3734
	11th to 20th	Night	29% 9% 24% 30% 8%	3557
	21st to end	Night	57% 8% 13% 16% 5%	3586
April	1st to 10th	Night	39% 7% 14% 27% 11% 2	1900
	11th to 20th	Night	44% 7% 13% 24% 11% 1	1877
	21st to end	Night	40% 7% 14% 26% 13% 1	1634
May	1st to 10th	Night	37% 9% 12% 27% 14% 2	2540
	11th to 20th	Night	33% 11% 17% 28% 11%	2518
	21st to end	Night	33% 12% 17% 28% 10% 1	2762
June	1st to 10th	Night	34% 8% 15% 25% 16% 2	1520
	11th to 20th	Night	31% 8% 19% 24% 15% 2	1435
	21st to end	Night	26% 7% 19% 30% 16% 3	1330
July	1st to 10th	Night	23% 6% 24% 26% 18% 3	2309
	11th to 20th	Night	21% 5% 11% 31% 22% 11%	2492
	21st to end	Night	18% 5% 9% 28% 32% 8%	2674
August	1st to 10th	Night	27% 5% 10% 26% 24% 8%	2520
	11th to 20th	Night	23% 6% 18% 33% 16% 4	2730
	21st to end	Night	24% 5% 12% 32% 21% 5%	3425
September	1st to 10th	Night	22% 6% 11% 29% 23% 8%	1900
	11th to 20th	Night	26% 7% 14% 29% 19% 6%	1900
	21st to end	Night	29% 4 13% 28% 23% 3	2137
October	1st to 10th	Night	26% 4 9% 31% 26% 5%	3800
	11th to 20th	Night	28% 4 10% 36% 21% 1	3778
	21st to end	Night	31% 5% 14% 32% 16% 2	4453
November	1st to 10th	Night	39% 7% 15% 25% 11% 2	2617
	11th to 20th	Night	39% 7% 20% 25% 8% 1	2800
	21st to end	Night	39% 7% 22% 22% 9% 1	2800
December	1st to 10th	Night	46% 7% 19% 20% 7%	2800
	11th to 20th	Night	40% 10% 20% 24% 6%	3412
	21st to end	Night	32% 6% 14% 30% 15% 4	4922

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	8% 7% 33% 30% 17% 5%	270
	11th to 20th	Day	10% 9% 31% 32% 15% 4	270
	21st to end	Day	9% 11% 32% 34% 12% 2	297
February	1st to 10th	Day	14% 8% 38% 33% 6% 1	270
	11th to 20th	Day	9% 9% 37% 31% 13%	270
	21st to end	Day	9% 5% 34% 34% 16% 2	225
March	1st to 10th	Day	12% 12% 33% 27% 14% 2	270
	11th to 20th	Day	11% 10% 36% 26% 13% 5%	413
	21st to end	Day	12% 8% 32% 30% 15% 3	506
April	1st to 10th	Day	12% 13% 36% 33% 7%	460
	11th to 20th	Day	17% 16% 36% 23% 7% 1	452
	21st to end	Day	16% 11% 27% 32% 13% 1	587
May	1st to 10th	Day	14% 9% 25% 32% 16% 5%	653
	11th to 20th	Day	14% 8% 25% 26% 20% 6%	675
	21st to end	Day	15% 8% 27% 26% 19% 6%	734
June	1st to 10th	Day	10% 12% 26% 30% 19% 3	680
	11th to 20th	Day	12% 16% 31% 29% 10% 3	680
	21st to end	Day	7% 7% 27% 34% 20% 5%	680
July	1st to 10th	Day	6% 3 25% 38% 23% 4	671
	11th to 20th	Day	4 7% 26% 42% 18% 4	668
	21st to end	Day	4 3 26% 36% 26% 6%	739
August	1st to 10th	Day	6% 4 24% 38% 21% 7%	676
	11th to 20th	Day	6% 6% 24% 33% 25% 6%	545
	21st to end	Day	8% 7% 21% 35% 25% 5%	539
September	1st to 10th	Day	9% 8% 25% 34% 19% 4	490
	11th to 20th	Day	11% 8% 25% 28% 25% 3	490
	21st to end	Day	16% 5% 28% 23% 23% 5%	314
October	1st to 10th	Day	19% 6% 23% 27% 16% 8%	300
	11th to 20th	Day	10% 9% 34% 27% 16% 4	300
	21st to end	Day	13% 15% 32% 26% 12% 2	330
November	1st to 10th	Day	16% 9% 31% 27% 17% 2	300
	11th to 20th	Day	8% 11% 35% 32% 12% 2	300
	21st to end	Day	6% 9% 37% 34% 13% 1	300
December	1st to 10th	Day	9% 10% 38% 30% 12% 1	300
	11th to 20th	Day	12% 10% 34% 32% 11% 1	300
	21st to end	Day	9% 6% 29% 34% 16% 6%	306
January	1st to 10th	Night	7% 8% 35% 37% 11% 2	950
	11th to 20th	Night	9% 10% 33% 35% 12% 1	950
	21st to end	Night	9% 9% 36% 36% 9% 1	1045
February	1st to 10th	Night	12% 7% 30% 37% 14% 1	807
	11th to 20th	Night	9% 6% 36% 38% 9% 1	744
	21st to end	Night	8% 6% 28% 37% 18% 3	628
March	1st to 10th	Night	8% 8% 34% 39% 10% 1	760
	11th to 20th	Night	9% 6% 32% 39% 12% 1	760
	21st to end	Night	10% 9% 29% 39% 13% 1	697
April	1st to 10th	Night	9% 9% 35% 39% 8% 1	570
	11th to 20th	Night	15% 9% 36% 34% 6%	563
	21st to end	Night	13% 8% 28% 40% 10%	570
May	1st to 10th	Night	15% 5% 25% 40% 15% 1	570
	11th to 20th	Night	13% 4 25% 39% 19% 1	561
	21st to end	Night	15% 7% 24% 35% 19% 1	617
June	1st to 10th	Night	12% 7% 29% 35% 16%	570
	11th to 20th	Night	10% 8% 34% 38% 11%	485
	21st to end	Night	6% 6% 26% 45% 15% 1	380
July	1st to 10th	Night	7% 2 26% 46% 17% 1	442
	11th to 20th	Night	5% 5% 29% 53% 8%	552
	21st to end	Night	4 4 25% 52% 15%	624
August	1st to 10th	Night	6% 3 26% 49% 15% 1	567
	11th to 20th	Night	5% 3 24% 48% 19% 2	564
	21st to end	Night	6% 4 22% 47% 20%	627
September	1st to 10th	Night	9% 3 19% 48% 19% 2	570
	11th to 20th	Night	10% 3 26% 41% 18% 1	570
	21st to end	Night	14% 4 26% 41% 15% 1	632
October	1st to 10th	Night	12% 6% 27% 38% 16% 1	760
	11th to 20th	Night	10% 9% 27% 38% 15% 1	760
	21st to end	Night	12% 7% 35% 35% 10% 1	1031
November	1st to 10th	Night	14% 9% 30% 37% 9% 1	975
	11th to 20th	Night	9% 10% 35% 35% 11% 1	1000
	21st to end	Night	8% 9% 34% 40% 9%	1000
December	1st to 10th	Night	10% 6% 35% 35% 14% 1	1000
	11th to 20th	Night	8% 9% 33% 38% 12% 1	1000
	21st to end	Night	11% 6% 31% 35% 16%	1063

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