Munro Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Munro Park 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	17% 12% 4 9% 5% 4 4 3 5% 6% 31%	101674
	Night	16% 14% 5% 10% 5% 4 4 3 4 5% 29%	97110
Transparency	Day	54% 5% 10% 20% 9% 1	101423
	Night	57% 5% 10% 18% 9% 1	96981
Seeing	Day	24% 16% 30% 20% 8% 2	15007
	Night	24% 14% 30% 24% 9% 1	23955

By Month

Percentage Cloud Cover NE (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	13% 24% 12% 15% 5% 3 3 2 3 4 15%	2208
	11th to 20th	Day	10% 14% 7% 21% 8% 6% 4 4 5% 5% 15%	2437
	21st to end	Day	15% 22% 10% 15% 5% 5% 4 2 3 4 16%	3124
February	1st to 10th	Day	11% 20% 7% 15% 9% 5% 5% 3 5% 4 18%	1710
	11th to 20th	Day	10% 18% 7% 13% 8% 4 4 3 4 5% 23%	1663
	21st to end	Day	15% 19% 5% 12% 7% 6% 4 3 3 4 22%	1413
March	1st to 10th	Day	16% 15% 5% 9% 5% 5% 4 4 5% 5% 26%	3425
	11th to 20th	Day	10% 18% 6% 14% 6% 5% 3 3 4 5% 25%	3480
	21st to end	Day	13% 14% 6% 9% 5% 6% 4 2 4 4 34%	3815
April	1st to 10th	Day	22% 15% 5% 7% 4 3 4 3 5% 6% 27%	2263
	11th to 20th	Day	21% 12% 4 6% 4 3 4 3 4 6% 32%	2375
	21st to end	Day	22% 12% 3 8% 4 3 3 3 3 5% 33%	2470
May	1st to 10th	Day	21% 10% 3 7% 4 4 4 3 5% 7% 32%	4236
	11th to 20th	Day	16% 9% 2 7% 5% 4 4 4 6% 8% 37%	4398
	21st to end	Day	20% 7% 2 6% 4 4 3 3 4 7% 41%	4837
June	1st to 10th	Day	20% 8% 3 8% 6% 4 4 4 5% 7% 32%	2753
	11th to 20th	Day	16% 6% 2 6% 6% 5% 5% 4 6% 7% 38%	2850
	21st to end	Day	21% 7% 3 6% 6% 4 5% 4 6% 7% 32%	2850
July	1st to 10th	Day	17% 7% 2 7% 5% 5% 5% 4 6% 7% 35%	4760
	11th to 20th	Day	16% 7% 2 6% 4 4 4 4 6% 8% 38%	4664
	21st to end	Day	13% 6% 2 5% 4 4 4 3 5% 7% 47%	4726
August	1st to 10th	Day	13% 7% 3 7% 5% 5% 6% 5% 7% 8% 35%	4104
	11th to 20th	Day	20% 7% 3 6% 4 4 5% 4 5% 8% 36%	4044
	21st to end	Day	11% 5% 2 6% 5% 5% 4 4 6% 9% 44%	4412
September	1st to 10th	Day	17% 8% 3 5% 4 4 4 3 5% 7% 40%	2280
	11th to 20th	Day	17% 7% 2 5% 4 3 4 3 5% 7% 43%	2187
	21st to end	Day	22% 9% 3 7% 4 3 5% 3 4 4 34%	2043
October	1st to 10th	Day	19% 12% 3 7% 5% 4 4 3 5% 6% 34%	1900
	11th to 20th	Day	23% 17% 3 8% 5% 4 4 3 5% 6% 22%	1900
	21st to end	Day	30% 19% 5% 7% 5% 4 3 2 4 5% 19%	1993
November	1st to 10th	Day	19% 17% 4 10% 5% 4 3 3 5% 7% 24%	1492
	11th to 20th	Day	16% 20% 7% 12% 6% 4 4 3 4 5% 19%	1520
	21st to end	Day	22% 22% 8% 11% 6% 5% 3 3 3 3 13%	1520
December	1st to 10th	Day	17% 23% 8% 14% 7% 5% 4 4 3 4 12%	1520
	11th to 20th	Day	17% 19% 5% 14% 6% 5% 4 3 4 5% 17%	1871
	21st to end	Day	20% 21% 9% 16% 5% 3 3 2 3 4 13%	2431
January	1st to 10th	Night	15% 19% 9% 16% 8% 5% 5% 3 3 4 13%	4748
	11th to 20th	Night	11% 15% 6% 17% 9% 7% 5% 3 4 5% 17%	4518
	21st to end	Night	12% 23% 10% 14% 6% 5% 4 3 4 3 15%	4532
February	1st to 10th	Night	11% 18% 6% 14% 8% 5% 5% 3 4 4 21%	2470
	11th to 20th	Night	12% 16% 7% 12% 8% 5% 4 4 4 5% 23%	2403
	21st to end	Night	13% 19% 6% 12% 7% 6% 5% 3 4 4 21%	2039
March	1st to 10th	Night	14% 15% 5% 9% 5% 4 4 3 5% 7% 30%	3414
	11th to 20th	Night	13% 20% 6% 9% 5% 4 4 3 4 5% 27%	3479
	21st to end	Night	12% 12% 7% 10% 7% 5% 3 3 4 5% 33%	3817
April	1st to 10th	Night	20% 16% 4 7% 4 3 3 4 5% 5% 29%	1916
	11th to 20th	Night	20% 11% 4 6% 4 3 4 2 5% 5% 36%	1772
	21st to end	Night	20% 12% 4 7% 6% 4 3 3 5% 4 31%	1710
May	1st to 10th	Night	16% 10% 2 6% 4 4 4 4 6% 7% 38%	2691
	11th to 20th	Night	14% 7% 2 6% 5% 4 5% 4 6% 8% 40%	2495
	21st to end	Night	14% 8% 2 7% 5% 4 4 3 5% 8% 40%	2738
June	1st to 10th	Night	14% 10% 3 8% 5% 5% 5% 5% 5% 6% 35%	1422
	11th to 20th	Night	16% 5% 2 6% 4 4 4 3 5% 9% 43%	1330
	21st to end	Night	15% 8% 3 8% 4 4 4 4 6% 7% 37%	1330
July	1st to 10th	Night	16% 6% 2 7% 4 4 3 3 5% 7% 44%	2210
	11th to 20th	Night	18% 6% 2 7% 3 4 3 3 5% 5% 43%	2302
	21st to end	Night	13% 6% 2 4 4 4 4 3 5% 8% 48%	2824
August	1st to 10th	Night	12% 6% 3 6% 4 4 5% 4 6% 7% 43%	2825
	11th to 20th	Night	16% 7% 2 7% 4 4 5% 3 5% 6% 41%	2785
	21st to end	Night	16% 5% 2 5% 3 4 3 3 5% 7% 48%	3211
September	1st to 10th	Night	15% 5% 2 4 4 4 3 3 4 7% 49%	1900
	11th to 20th	Night	17% 7% 1 6% 4 4 3 2 4 6% 47%	1990
	21st to end	Night	17% 8% 2 7% 3 4 3 3 5% 7% 40%	2137
October	1st to 10th	Night	19% 10% 3 7% 4 4 4 3 4 6% 35%	2280
	11th to 20th	Night	23% 15% 3 8% 5% 4 4 3 5% 5% 25%	2280
	21st to end	Night	26% 19% 3 8% 4 4 3 3 4 4 22%	2426
November	1st to 10th	Night	18% 16% 4 7% 5% 4 4 3 4 5% 29%	2584
	11th to 20th	Night	18% 17% 5% 11% 6% 5% 4 3 4 5% 21%	2660
	21st to end	Night	21% 20% 6% 12% 6% 4 3 3 4 4 17%	2660
December	1st to 10th	Night	17% 25% 7% 15% 7% 4 3 3 3 3 12%	2660
	11th to 20th	Night	15% 20% 7% 14% 7% 4 4 3 4 4 17%	3316
	21st to end	Night	20% 20% 8% 17% 6% 4 4 2 3 3 13%	5236

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	75% 3 9% 10% 3	2209
	11th to 20th	Day	70% 5% 8% 10% 6% 1	2437
	21st to end	Day	74% 4 6% 10% 5% 1	3124
February	1st to 10th	Day	71% 4 6% 12% 6% 1	1710
	11th to 20th	Day	64% 4 10% 13% 8% 1	1672
	21st to end	Day	67% 4 6% 15% 8%	1413
March	1st to 10th	Day	60% 6% 11% 10% 12% 1	3428
	11th to 20th	Day	62% 5% 10% 16% 7% 1	3480
	21st to end	Day	53% 6% 8% 20% 11% 2	3815
April	1st to 10th	Day	59% 4 8% 18% 10% 2	2263
	11th to 20th	Day	54% 5% 8% 21% 12% 1	2375
	21st to end	Day	55% 4 7% 17% 14% 3	2470
May	1st to 10th	Day	52% 7% 7% 22% 11% 2	4248
	11th to 20th	Day	44% 7% 10% 29% 8% 1	4402
	21st to end	Day	44% 5% 12% 19% 17% 2	4837
June	1st to 10th	Day	51% 6% 10% 20% 12%	2753
	11th to 20th	Day	45% 6% 10% 25% 13% 1	2850
	21st to end	Day	50% 7% 11% 19% 11% 1	2850
July	1st to 10th	Day	47% 6% 14% 24% 9% 1	4686
	11th to 20th	Day	42% 6% 14% 30% 7%	4583
	21st to end	Day	37% 5% 11% 31% 16%	4575
August	1st to 10th	Day	46% 6% 11% 30% 7%	4091
	11th to 20th	Day	46% 6% 14% 26% 8% 1	4083
	21st to end	Day	38% 5% 12% 34% 11%	4412
September	1st to 10th	Day	45% 6% 12% 25% 12%	2280
	11th to 20th	Day	42% 5% 13% 29% 11%	2187
	21st to end	Day	54% 6% 10% 23% 8%	2043
October	1st to 10th	Day	52% 6% 12% 20% 10% 1	1900
	11th to 20th	Day	63% 6% 12% 13% 6%	1900
	21st to end	Day	70% 4 9% 11% 6%	1993
November	1st to 10th	Day	61% 6% 12% 16% 5%	1492
	11th to 20th	Day	68% 5% 10% 10% 6% 1	1520
	21st to end	Day	77% 5% 8% 8% 2	1520
December	1st to 10th	Day	77% 5% 7% 8% 2 1	1520
	11th to 20th	Day	71% 6% 6% 12% 5%	1871
	21st to end	Day	78% 4 4 12% 2	2431
January	1st to 10th	Night	76% 6% 8% 7% 3	4748
	11th to 20th	Night	69% 7% 10% 10% 4	4518
	21st to end	Night	74% 4 7% 10% 5% 1	4532
February	1st to 10th	Night	67% 4 9% 13% 7% 1	2470
	11th to 20th	Night	63% 5% 10% 16% 5% 1	2405
	21st to end	Night	66% 5% 7% 14% 7% 1	2039
March	1st to 10th	Night	55% 6% 11% 15% 12% 1	3424
	11th to 20th	Night	60% 5% 11% 15% 8% 1	3480
	21st to end	Night	54% 5% 7% 21% 12% 2	3817
April	1st to 10th	Night	58% 4 7% 18% 11% 2	1916
	11th to 20th	Night	51% 3 7% 22% 14% 2	1772
	21st to end	Night	56% 4 7% 15% 15% 3	1710
May	1st to 10th	Night	46% 6% 10% 25% 12% 1	2698
	11th to 20th	Night	41% 8% 11% 26% 13% 2	2496
	21st to end	Night	43% 5% 11% 24% 16% 2	2739
June	1st to 10th	Night	49% 7% 9% 22% 10% 3	1422
	11th to 20th	Night	39% 6% 10% 27% 17% 1	1330
	21st to end	Night	46% 7% 13% 22% 11% 1	1330
July	1st to 10th	Night	41% 4 14% 27% 14% 1	2175
	11th to 20th	Night	43% 5% 14% 29% 8% 1	2260
	21st to end	Night	36% 5% 11% 31% 17% 1	2734
August	1st to 10th	Night	40% 5% 15% 26% 12% 2	2814
	11th to 20th	Night	43% 7% 16% 25% 8% 1	2812
	21st to end	Night	37% 5% 14% 31% 12% 1	3211
September	1st to 10th	Night	37% 5% 15% 30% 12% 1	1900
	11th to 20th	Night	40% 4 15% 28% 12%	1990
	21st to end	Night	45% 5% 14% 26% 10%	2137
October	1st to 10th	Night	50% 6% 11% 20% 12%	2280
	11th to 20th	Night	62% 5% 11% 17% 6%	2280
	21st to end	Night	68% 5% 9% 11% 7%	2426
November	1st to 10th	Night	58% 6% 13% 18% 5%	2584
	11th to 20th	Night	64% 5% 12% 12% 5% 1	2660
	21st to end	Night	73% 6% 10% 8% 3	2660
December	1st to 10th	Night	79% 4 6% 8% 3	2660
	11th to 20th	Night	72% 5% 6% 12% 5%	3316
	21st to end	Night	78% 4 6% 9% 3	5236

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	24% 29% 23% 14% 8% 1	180
	11th to 20th	Day	21% 21% 34% 16% 8%	193
	21st to end	Day	26% 16% 33% 19% 5% 1	297
February	1st to 10th	Day	29% 26% 34% 9% 2	270
	11th to 20th	Day	22% 30% 36% 11% 1	270
	21st to end	Day	36% 24% 33% 6%	225
March	1st to 10th	Day	25% 22% 37% 14% 2	453
	11th to 20th	Day	19% 23% 38% 14% 5% 1	460
	21st to end	Day	28% 22% 28% 17% 4 1	506
April	1st to 10th	Day	30% 19% 29% 17% 5% 1	460
	11th to 20th	Day	36% 18% 22% 14% 9% 2	452
	21st to end	Day	30% 20% 28% 15% 5% 2	460
May	1st to 10th	Day	28% 15% 29% 18% 8% 2	463
	11th to 20th	Day	24% 16% 28% 20% 10% 2	487
	21st to end	Day	22% 15% 32% 19% 10% 2	529
June	1st to 10th	Day	22% 14% 33% 23% 6% 1	583
	11th to 20th	Day	18% 14% 35% 22% 8% 3	680
	21st to end	Day	23% 14% 34% 18% 10% 1	680
July	1st to 10th	Day	14% 11% 32% 32% 9% 1	671
	11th to 20th	Day	18% 13% 28% 28% 12% 2	611
	21st to end	Day	15% 11% 29% 30% 13% 3	532
August	1st to 10th	Day	20% 8% 27% 28% 13% 5%	486
	11th to 20th	Day	20% 4 24% 27% 16% 8%	479
	21st to end	Day	17% 13% 30% 25% 11% 5%	539
September	1st to 10th	Day	20% 13% 28% 23% 11% 5%	490
	11th to 20th	Day	19% 8% 27% 25% 13% 7%	490
	21st to end	Day	25% 14% 23% 22% 13% 2	490
October	1st to 10th	Day	25% 14% 28% 20% 11% 2	490
	11th to 20th	Day	28% 20% 34% 13% 4 1	490
	21st to end	Day	39% 17% 29% 13% 2 1	490
November	1st to 10th	Day	28% 22% 35% 11% 3 1	183
	11th to 20th	Day	26% 24% 38% 7% 3 1	180
	21st to end	Day	32% 22% 37% 8% 1 1	180
December	1st to 10th	Day	28% 21% 33% 16% 2	180
	11th to 20th	Day	30% 22% 31% 14% 3 1	180
	21st to end	Day	31% 22% 27% 17% 3 1	198
January	1st to 10th	Night	26% 17% 32% 19% 5% 1	950
	11th to 20th	Night	27% 17% 30% 21% 5%	832
	21st to end	Night	21% 12% 33% 24% 9% 1	836
February	1st to 10th	Night	21% 21% 36% 18% 4	760
	11th to 20th	Night	20% 19% 36% 20% 5%	743
	21st to end	Night	23% 20% 35% 20% 3	628
March	1st to 10th	Night	20% 21% 33% 21% 4	760
	11th to 20th	Night	24% 20% 33% 18% 5% 1	760
	21st to end	Night	20% 15% 33% 25% 7% 1	836
April	1st to 10th	Night	30% 13% 32% 20% 5%	760
	11th to 20th	Night	28% 18% 25% 22% 8% 1	648
	21st to end	Night	25% 14% 26% 24% 9% 1	570
May	1st to 10th	Night	22% 9% 30% 30% 9% 1	493
	11th to 20th	Night	20% 10% 31% 28% 9% 1	374
	21st to end	Night	17% 9% 34% 31% 8%	411
June	1st to 10th	Night	17% 9% 33% 31% 11%	380
	11th to 20th	Night	18% 10% 25% 36% 12%	380
	21st to end	Night	18% 6% 30% 32% 14% 1	380
July	1st to 10th	Night	15% 4 28% 40% 12% 1	370
	11th to 20th	Night	13% 5% 27% 35% 19% 1	368
	21st to end	Night	14% 5% 27% 37% 17%	465
August	1st to 10th	Night	17% 4 23% 36% 19% 1	567
	11th to 20th	Night	16% 5% 19% 37% 21% 3	564
	21st to end	Night	20% 8% 25% 28% 16% 2	675
September	1st to 10th	Night	19% 6% 27% 30% 17% 1	760
	11th to 20th	Night	20% 7% 26% 25% 19% 3	760
	21st to end	Night	22% 9% 23% 28% 16% 2	760
October	1st to 10th	Night	24% 12% 29% 24% 9% 1	760
	11th to 20th	Night	32% 14% 27% 19% 7% 1	760
	21st to end	Night	36% 15% 28% 18% 3	805
November	1st to 10th	Night	29% 14% 30% 19% 7% 1	740
	11th to 20th	Night	26% 19% 31% 16% 6%	760
	21st to end	Night	32% 16% 29% 19% 3	760
December	1st to 10th	Night	30% 19% 30% 15% 5%	760
	11th to 20th	Night	26% 19% 34% 16% 3 2	775
	21st to end	Night	30% 17% 29% 19% 4	1045

Page generated at 2024-10-21 02:20:01. Version ac07

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